Hi ,
I have been surfing sites like Chronos , RDG and RHR looking for some 
tooling and I noticed the number of different collets available ,
this is leading to some confusion on my behalf.

  Just wondering why there are so many differnt collets , there are ER 
32, ER35, ER40 etc and probably a heap more that I have not seen or 
heard off .
What are differences and advantages one over the other.?

The ones I remember from my trade days were threaded and were drawn into 
the lathe spindle using a draw bar and hand wheel on the out board end 
of the spindle.
(Hope I'm not telling my age here.)

I'm not looking to buy any , as I have a full set of what I think are 
Myford collets and a chuck that came with the Super 7 . There is one 
"ring in" in the set it has Hardinge stamped on it and is slightly 
different in the profile (concave)on the front face.
I don't use them a lot ,but if you are machining lots of parts from 
small diameters they would make life easier.

Thanks .
-- 
Kevin (Bluey)
"I'm not young enough to know everything."

bluey69@west.net.com.au

In article , "Kevin(Bluey)" 
 writes
>Hi ,
>I have been surfing sites like Chronos , RDG and RHR looking for some 
>tooling and I noticed the number of different collets available ,
>this is leading to some confusion on my behalf.
>
> Just wondering why there are so many differnt collets , there are ER 
>32, ER35, ER40 etc and probably a heap more that I have not seen or 
>heard off .
>What are differences and advantages one over the other.?
>
>The ones I remember from my trade days were threaded and were drawn 
>into the lathe spindle using a draw bar and hand wheel on the out board 
>end of the spindle.
>(Hope I'm not telling my age here.)
>
>I'm not looking to buy any , as I have a full set of what I think are 
>Myford collets and a chuck that came with the Super 7 . There is one 
>"ring in" in the set it has Hardinge stamped on it and is slightly 
>different in the profile (concave)on the front face.
>I don't use them a lot ,but if you are machining lots of parts from 
>small diameters they would make life easier.
>
>Thanks .

The great advantage of ER collets is that their double taper means they 
can close down by 1.0mm (0.5 for the very small sizes) and still 
maintain excellent grip and concentricity. Collets with a single taper 
will only work efficiently for material of the exact diameter of the 
collet; even normal mild steel (usually a few thou under nominal) can be 
a problem with single taper collets.

This means that a set of ER collets will grip anything within their 
range - you don't need a metric set and an imperial set, for instance. 
They will grip milling cutters effectively. The collets themselves do 
not need a drawbar as the double taper holds them in; it is the collet 
chuck itself that needs a drawbar, at least when holding milling 
cutters.

The different numbers are just sizes. ER25 (the set I use) goes from 1.0 
to 16.0 mm; the larger sets have a correspondingly larger range.

David
-- 
David Littlewood

> The great advantage of ER collets is that their double taper means they 
> can close down by 1.0mm (0.5 for the very small sizes) and still 
> maintain excellent grip and concentricity. Collets with a single taper 
> will only work efficiently for material of the exact diameter of the 
> collet; even normal mild steel (usually a few thou under nominal) can be 
> a problem with single taper collets.
> 
> This means that a set of ER collets will grip anything within their 
> range - you don't need a metric set and an imperial set, for instance. 
> They will grip milling cutters effectively. The collets themselves do 
> not need a drawbar as the double taper holds them in; it is the collet 
> chuck itself that needs a drawbar, at least when holding milling cutters.
> 
> The different numbers are just sizes. ER25 (the set I use) goes from 1.0 
> to 16.0 mm; the larger sets have a correspondingly larger range.
> 
> David


David ,
Thanks for clearing that up .
I thought it was some evil conspiricy to extract more folding green from 
our pockets by having to buy a set of each because of some manufactured 
difference.

-- 
Kevin (Bluey)
"I'm not young enough to know everything."

bluey69@west.net.com.au

In article , 
"Kevin(Bluey)"  writes
>
>> The great advantage of ER collets is that their double taper means 
>>they can close down by 1.0mm (0.5 for the very small sizes) and still 
>>maintain excellent grip and concentricity. Collets with a single taper 
>>only work efficiently for material of the exact diameter of the 
>>collet; even normal mild steel (usually a few thou under nominal) can 
>>be  a problem with single taper collets.
>>  This means that a set of ER collets will grip anything within their 
>>range - you don't need a metric set and an imperial set, for instance. 
>>They will grip milling cutters effectively. The collets themselves do 
>>need a drawbar as the double taper holds them in; it is the collet 
>>chuck itself that needs a drawbar, at least when holding milling 
>>cutters.
>>  The different numbers are just sizes. ER25 (the set I use) goes from 
>>1.0  to 16.0 mm; the larger sets have a correspondingly larger range.
>>  David
>
>
>David ,
>Thanks for clearing that up .
>I thought it was some evil conspiricy to extract more folding green 
>from our pockets by having to buy a set of each because of some 
>manufactured difference.
>
Just to make sure there is no confusion, I should explain that the 
different sets are different in size. They are not interchangeable 
between sets. I think it would be unfair to say this is done to extract 
more money, just that there is a set appropriate for your equipment. 
Thus, for my lathe (S7) and milling machine (Emco FB2) the ER25 size is 
about right; the holders for the larger sets would be inconveniently 
large for the 2MT spindle. The "25" in ER25 refers, I think, to the 
widest part of the chuck taper, the actual collets are about 26mm at 
their widest point.

Don't let the profusion put you off, just find the right size for your 
machinery and buy a set, you will find them invaluable.

See, for example:

http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks

Not sure, reading my previous post, that this was clear.

David
-- 
David Littlewood

David Littlewood wrote:
> In article , 
> "Kevin(Bluey)"  writes
>>
>>> The great advantage of ER collets is that their double taper means 
>>> they can close down by 1.0mm (0.5 for the very small sizes) and still 
>>> maintain excellent grip and concentricity. Collets with a single 
>>> taper only work efficiently for material of the exact diameter of the 
>>> collet; even normal mild steel (usually a few thou under nominal) can 
>>> be  a problem with single taper collets.
>>>  This means that a set of ER collets will grip anything within their 
>>> range - you don't need a metric set and an imperial set, for 
>>> instance. They will grip milling cutters effectively. The collets 
>>> themselves do need a drawbar as the double taper holds them in; it is 
>>> the collet chuck itself that needs a drawbar, at least when holding 
>>> milling cutters.
>>>  The different numbers are just sizes. ER25 (the set I use) goes from 
>>> 1.0  to 16.0 mm; the larger sets have a correspondingly larger range.
>>>  David
>>
>>
>> David ,
>> Thanks for clearing that up .
>> I thought it was some evil conspiricy to extract more folding green 
>> from our pockets by having to buy a set of each because of some 
>> manufactured difference.
>>
> Just to make sure there is no confusion, I should explain that the 
> different sets are different in size. They are not interchangeable 
> between sets. I think it would be unfair to say this is done to extract 
> more money, just that there is a set appropriate for your equipment. 
> Thus, for my lathe (S7) and milling machine (Emco FB2) the ER25 size is 
> about right; the holders for the larger sets would be inconveniently 
> large for the 2MT spindle. The "25" in ER25 refers, I think, to the 
> widest part of the chuck taper, the actual collets are about 26mm at 
> their widest point.
> 
> Don't let the profusion put you off, just find the right size for your 
> machinery and buy a set, you will find them invaluable.
> 
> See, for example:
> 
> http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks
> 
> Not sure, reading my previous post, that this was clear.
> 
> David


All clear and understood.

I had that link bookmarked , and will check it out again.

Not sure I'll buy a set just yet ,I still have the Myford collet set 
,But these below would be able to fit my drill press and a future  mill 
with the MT 2 chuck.
I have some other tooling I want to get first

Found this set on the Bay ,price is good ,not sure on the quality ,
made in the Peoples Republic of C .

http://cgi.ebay.com.au/FULL-ER25-COLLET-SET-15-PCS-CNC-MILLING-LATHE-NEW-A05_W0QQitemZ110265889934QQihZ001QQcategoryZ25294QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262
and the MT 2 chuck ,
http://cgi.ebay.co.uk/ER25-MT2-3-8-COLLET-CHUCK-CNC-MILLING-LATHE-NEW-A68_W0QQitemZ110265134618QQihZ001QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262

On the collet page if you scroll down he has a handy chart with all the 
collet sizes etc.


Thanks again

-- 
Kevin (Bluey)
"I'm not young enough to know everything."

bluey69@west.net.com.au

In article , 
"Kevin(Bluey)"  writes
>
>All clear and understood.
>
>I had that link bookmarked , and will check it out again.
>
>Not sure I'll buy a set just yet ,I still have the Myford collet set 
>,But these below would be able to fit my drill press and a future  mill 
>with the MT 2 chuck.
>I have some other tooling I want to get first
>
>Found this set on the Bay ,price is good ,not sure on the quality ,
>made in the Peoples Republic of C .
>
>http://cgi.ebay.com.au/FULL-ER25-COLLET-SET-15-PCS-CNC-MILLING-LATHE-NEW
>-A05_W0QQitemZ110265889934QQihZ001QQcategoryZ25294QQtcZphotoQQcmdZViewIt
>emQQ_trksidZp1742.m153.l1262
>and the MT 2 chuck ,
>http://cgi.ebay.co.uk/ER25-MT2-3-8-COLLET-CHUCK-CNC-MILLING-LATHE-NEW-A6
>8_W0QQitemZ110265134618QQihZ001QQcategoryZ12584QQtcZphotoQQcmdZViewItemQ
>Q_trksidZp1742.m153.l1262
>
>On the collet page if you scroll down he has a handy chart with all the 
>collet sizes etc.
>
Well the price is certainly attractive. Some of the cheaper sets have 
been reported to have slightly higher run-out (lack of concentricity) 
than they should, but for the holders at least it is possible to clean 
them up in the lathe you will be using it on (see correspondence here a 
few months ago). Not much you can do if the collets are out of true. Try 
looking at the seller's feedback to see if anyone has complained, or 
asking around.

David
-- 
David Littlewood

David Littlewood wrote:
> In article , 
> "Kevin(Bluey)"  writes
>>
>>> The great advantage of ER collets is that their double taper means 
>>> they can close down by 1.0mm (0.5 for the very small sizes) and still 
>>> maintain excellent grip and concentricity. Collets with a single 
>>> taper only work efficiently for material of the exact diameter of the 
>>> collet; even normal mild steel (usually a few thou under nominal) can 
>>> be  a problem with single taper collets.
>>>  This means that a set of ER collets will grip anything within their 
>>> range - you don't need a metric set and an imperial set, for 
>>> instance. They will grip milling cutters effectively. The collets 
>>> themselves do need a drawbar as the double taper holds them in; it is 
>>> the collet chuck itself that needs a drawbar, at least when holding 
>>> milling cutters.
>>>  The different numbers are just sizes. ER25 (the set I use) goes from 
>>> 1.0  to 16.0 mm; the larger sets have a correspondingly larger range.
>>>  David
>>
>>
>> David ,
>> Thanks for clearing that up .
>> I thought it was some evil conspiricy to extract more folding green 
>> from our pockets by having to buy a set of each because of some 
>> manufactured difference.
>>
> Just to make sure there is no confusion, I should explain that the 
> different sets are different in size. They are not interchangeable 
> between sets. I think it would be unfair to say this is done to extract 
> more money, just that there is a set appropriate for your equipment. 
> Thus, for my lathe (S7) and milling machine (Emco FB2) the ER25 size is 
> about right; the holders for the larger sets would be inconveniently 
> large for the 2MT spindle. The "25" in ER25 refers, I think, to the 
> widest part of the chuck taper, the actual collets are about 26mm at 
> their widest point.
> 
> Don't let the profusion put you off, just find the right size for your 
> machinery and buy a set, you will find them invaluable.
> 
> See, for example:
> 
> http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks
> 
> Not sure, reading my previous post, that this was clear.


AET stuff is nice, but for ER25 collets

http://cgi.ebay.co.uk/FULL-ER25-COLLET-SET-15-PCS-CNC-MILLING-LATHE-NEW-A05_W0QQitemZ120273119058QQcmdZViewItem?_trksid=p3286.m20.l1116

is pretty good quality, and a quarter the price - and at under £18 for 
the full set there's no VAT or customs fees to pay.

(satisfied customer only)

-- Peter Fairbrother

David Littlewood wrote:
> In article , "Kevin(Bluey)" 
>  writes
>> Hi ,
>> I have been surfing sites like Chronos , RDG and RHR looking for some 
>> tooling and I noticed the number of different collets available ,
>> this is leading to some confusion on my behalf.
>>
>> Just wondering why there are so many differnt collets , there are ER 
>> 32, ER35, ER40 etc and probably a heap more that I have not seen or 
>> heard off .
>> What are differences and advantages one over the other.?
>>
>> The ones I remember from my trade days were threaded and were drawn 
>> into the lathe spindle using a draw bar and hand wheel on the out 
>> board end of the spindle.
>> (Hope I'm not telling my age here.)
>>
>> I'm not looking to buy any , as I have a full set of what I think are 
>> Myford collets and a chuck that came with the Super 7 . There is one 
>> "ring in" in the set it has Hardinge stamped on it and is slightly 
>> different in the profile (concave)on the front face.
>> I don't use them a lot ,but if you are machining lots of parts from 
>> small diameters they would make life easier.
>>
>> Thanks .
> 
> The great advantage of ER collets is that their double taper means they 
> can close down by 1.0mm (0.5 for the very small sizes) and still 
> maintain excellent grip and concentricity. Collets with a single taper 
> will only work efficiently for material of the exact diameter of the 
> collet; even normal mild steel (usually a few thou under nominal) can be 
> a problem with single taper collets.

I'm not sure that it's the double taper so much as the fact that there 
are eight gripping segments, rather than three in a normal collet.

In a three-segement collet the inside of the segments is round, and if 
it is used to grip a tool which is slightly smaller than the hole then 
each segment will only touch the tool on a thin line.

With eight (or perhaps sixteen) segments an ER collet will grip on 8 or 
16 lines, rather than 3.

Also, as there are 8/16 gaps, they can close up more than i=f there are 
three gaps.


-- Peter Fairbrother

> 
> This means that a set of ER collets will grip anything within their 
> range - you don't need a metric set and an imperial set, for instance. 
> They will grip milling cutters effectively. The collets themselves do 
> not need a drawbar as the double taper holds them in; it is the collet 
> chuck itself that needs a drawbar, at least when holding milling cutters.
> 
> The different numbers are just sizes. ER25 (the set I use) goes from 1.0 
> to 16.0 mm; the larger sets have a correspondingly larger range.
> 
> David

Kevin(Bluey) wrote:
> David Littlewood wrote:
>> In article , 
>> "Kevin(Bluey)"  writes
>>>
>>>> The great advantage of ER collets is that their double taper means 
>>>> they can close down by 1.0mm (0.5 for the very small sizes) and 
>>>> still maintain excellent grip and concentricity. Collets with a 
>>>> single taper only work efficiently for material of the exact 
>>>> diameter of the collet; even normal mild steel (usually a few thou 
>>>> under nominal) can be  a problem with single taper collets.
>>>>  This means that a set of ER collets will grip anything within their 
>>>> range - you don't need a metric set and an imperial set, for 
>>>> instance. They will grip milling cutters effectively. The collets 
>>>> themselves do need a drawbar as the double taper holds them in; it 
>>>> is the collet chuck itself that needs a drawbar, at least when 
>>>> holding milling cutters.
>>>>  The different numbers are just sizes. ER25 (the set I use) goes 
>>>> from 1.0  to 16.0 mm; the larger sets have a correspondingly larger 
>>>> range.
>>>>  David
>>>
>>>
>>> David ,
>>> Thanks for clearing that up .
>>> I thought it was some evil conspiricy to extract more folding green 
>>> from our pockets by having to buy a set of each because of some 
>>> manufactured difference.
>>>
>> Just to make sure there is no confusion, I should explain that the 
>> different sets are different in size. They are not interchangeable 
>> between sets. I think it would be unfair to say this is done to 
>> extract more money, just that there is a set appropriate for your 
>> equipment. Thus, for my lathe (S7) and milling machine (Emco FB2) the 
>> ER25 size is about right; the holders for the larger sets would be 
>> inconveniently large for the 2MT spindle. The "25" in ER25 refers, I 
>> think, to the widest part of the chuck taper, the actual collets are 
>> about 26mm at their widest point.
>>
>> Don't let the profusion put you off, just find the right size for your 
>> machinery and buy a set, you will find them invaluable.
>>
>> See, for example:
>>
>> http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks
>>
>> Not sure, reading my previous post, that this was clear.
>>
>> David
> 
> 
> All clear and understood.
> 
> I had that link bookmarked , and will check it out again.
> 
> Not sure I'll buy a set just yet ,I still have the Myford collet set 
> ,But these below would be able to fit my drill press and a future  mill 
> with the MT 2 chuck.
> I have some other tooling I want to get first
> 
> Found this set on the Bay ,price is good ,not sure on the quality ,
> made in the Peoples Republic of C .
> 
> http://cgi.ebay.com.au/FULL-ER25-COLLET-SET-15-PCS-CNC-MILLING-LATHE-NEW-A05_W0QQitemZ110265889934QQihZ001QQcategoryZ25294QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262 
> 
> and the MT 2 chuck ,
> http://cgi.ebay.co.uk/ER25-MT2-3-8-COLLET-CHUCK-CNC-MILLING-LATHE-NEW-A68_W0QQitemZ110265134618QQihZ001QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262 
> 
> 
> On the collet page if you scroll down he has a handy chart with all the 
> collet sizes etc.

Missed this post.

The cheap ones can be pretty good, I bought an ER25 set all of which 
have a TIR within a single 1/100 mm division on a normal dial gauge.


Which is pretty darn good.

YMMV,

-- Peter Fairbrother

In article , Peter Fairbrother 
 writes
>David Littlewood wrote:
>>  The great advantage of ER collets is that their double taper means 
>>they  can close down by 1.0mm (0.5 for the very small sizes) and still 
>>maintain excellent grip and concentricity. Collets with a single taper 
>>only work efficiently for material of the exact diameter of the 
>>collet; even normal mild steel (usually a few thou under nominal) can 
>>be  a problem with single taper collets.
>
>I'm not sure that it's the double taper so much as the fact that there 
>are eight gripping segments, rather than three in a normal collet.
>
>In a three-segement collet the inside of the segments is round, and if 
>it is used to grip a tool which is slightly smaller than the hole then 
>each segment will only touch the tool on a thin line.
>
>With eight (or perhaps sixteen) segments an ER collet will grip on 8 or 
>16 lines, rather than 3.
>
>Also, as there are 8/16 gaps, they can close up more than i=f there are 
>three gaps.
>
The eight slits help improve grip, of course, but I believe it is the 
double taper and the fact that the slits are alternately from front and 
back. This means that on closing down the collet grips the work or 
cutter at front and back (indeed probably all the way along) instead of 
just at the front. Some text books even show this diagrammatically.

David
-- 
David Littlewood

Peter Fairbrother wrote:
> David Littlewood wrote:
>> In article , "Kevin(Bluey)" 
>>  writes
>>> Hi ,
>>> I have been surfing sites like Chronos , RDG and RHR looking for some 
>>> tooling and I noticed the number of different collets available ,
>>> this is leading to some confusion on my behalf.
>>>
>>> Just wondering why there are so many differnt collets , there are ER 
>>> 32, ER35, ER40 etc and probably a heap more that I have not seen or 
>>> heard off .
>>> What are differences and advantages one over the other.?
>>>
>>> The ones I remember from my trade days were threaded and were drawn 
>>> into the lathe spindle using a draw bar and hand wheel on the out 
>>> board end of the spindle.
>>> (Hope I'm not telling my age here.)
>>>
>>> I'm not looking to buy any , as I have a full set of what I think are 
>>> Myford collets and a chuck that came with the Super 7 . There is one 
>>> "ring in" in the set it has Hardinge stamped on it and is slightly 
>>> different in the profile (concave)on the front face.
>>> I don't use them a lot ,but if you are machining lots of parts from 
>>> small diameters they would make life easier.
>>>
>>> Thanks .
>>
>> The great advantage of ER collets is that their double taper means 
>> they can close down by 1.0mm (0.5 for the very small sizes) and still 
>> maintain excellent grip and concentricity. Collets with a single taper 
>> will only work efficiently for material of the exact diameter of the 
>> collet; even normal mild steel (usually a few thou under nominal) can 
>> be a problem with single taper collets.
> 
> I'm not sure that it's the double taper so much as the fact that there 
> are eight gripping segments, rather than three in a normal collet.
> 
> In a three-segement collet the inside of the segments is round, and if 
> it is used to grip a tool which is slightly smaller than the hole then 
> each segment will only touch the tool on a thin line.
> 
> With eight (or perhaps sixteen) segments an ER collet will grip on 8 or 
> 16 lines, rather than 3.
> 
> Also, as there are 8/16 gaps, they can close up more than i=f there are 
> three gaps.
> 
> 
> -- Peter Fairbrother
> 
>>
>> This means that a set of ER collets will grip anything within their 
>> range - you don't need a metric set and an imperial set, for instance. 
>> They will grip milling cutters effectively. The collets themselves do 
>> not need a drawbar as the double taper holds them in; it is the collet 
>> chuck itself that needs a drawbar, at least when holding milling cutters.
>>
>> The different numbers are just sizes. ER25 (the set I use) goes from 
>> 1.0 to 16.0 mm; the larger sets have a correspondingly larger range.
>>
>> David


David ,
Thank you for your in informative explaination ,its has been most helpful.
This news group is one of the best on usenet , and the people friendly 
and helpful.

-- 
Kevin (Bluey)
"I'm not young enough to know everything."

bluey69@west.net.com.au

David Littlewood wrote:
> In article , Peter Fairbrother 
>  writes
>> David Littlewood wrote:
>>>  The great advantage of ER collets is that their double taper means 
>>> they  can close down by 1.0mm (0.5 for the very small sizes) and 
>>> still maintain excellent grip and concentricity. Collets with a 
>>> single taper only work efficiently for material of the exact diameter 
>>> of the collet; even normal mild steel (usually a few thou under 
>>> nominal) can be  a problem with single taper collets.
>>
>> I'm not sure that it's the double taper so much as the fact that there 
>> are eight gripping segments, rather than three in a normal collet.
>>
>> In a three-segment collet the inside of the segments is round, and if 
>> it is used to grip a tool which is slightly smaller than the hole then 
>> each segment will only touch the tool on a thin line.
>>
>> With eight (or perhaps sixteen) segments an ER collet will grip on 8 
>> or 16 lines, rather than 3.
>>
>> Also, as there are 8/16 gaps, they can close up more than i=f there 
>> are three gaps.
>>
> The eight slits help improve grip, of course, but I believe it is the 
> double taper and the fact that the slits are alternately from front and 
> back. This means that on closing down the collet grips the work or 
> cutter at front and back (indeed probably all the way along) instead of 
> just at the front. 

Yes, it's most helpful having the contact surfaces go all along the 
length (rather than squeezing one end of the tool shaft at the point 
where it leaves the collet, and leaving the other end inside the collet 
wobbling about).

This happens because the inside of an ER collet remains parallel to the 
tool when compressed, because the main taper acts along all the length 
of the collet. Move the collet in a bit and both ends move in, rather 
than just one.

A collet with a single taper would do this too.


I'm not sure what the second, front taper on an ER collet does? Makes 
the front end grip hardest? angles the compressive force properly?

Anyone?



-- Peter Fairbrother



Some text books even show this diagrammatically.

You read the instructions?


> 
> David

In article <486df1b8$0$2518$da0feed9@news.zen.co.uk>, Peter Fairbrother 
 writes
>
>Yes, it's most helpful having the contact surfaces go all along the 
>length (rather than squeezing one end of the tool shaft at the point 
>where it leaves the collet, and leaving the other end inside the collet 
>wobbling about).
>
>This happens because the inside of an ER collet remains parallel to the 
>tool when compressed, because the main taper acts along all the length 
>of the collet. Move the collet in a bit and both ends move in, rather 
>than just one.
>
>A collet with a single taper would do this too.
>
>
>I'm not sure what the second, front taper on an ER collet does? Makes 
>the front end grip hardest? angles the compressive force properly?
>
It may be that it allows easy changing of collets from the front without 
need for a drawbar (apart from the one on the collet chuck, of course). 
But I think the front taper, as you say, improves the grip at the front.
>
>Some text books even show this diagrammatically.
>
>You read the instructions?
>
Well, more that I just noticed it somewhere. Actually, there is a little 
subtlety in loading an ER collet into the closing nut, so RTFM is not a 
bad idea in this case.

David
-- 
David Littlewood

hello Kevin,
just one thing to point out - although each closes down by up to 1mm - it a 
good idea at the outset to decide if you are 'imperial or metric' - it isn't 
true to say that a set will hold all cutting tools within the range of the 
set.
If you look at the link below, you will see that the 14mm collet will close 
down to 13mm, but the next one down is a 12mm collet - so there isn't a 
collet to hold a 1/2" tool - ditto 1/4".
So you might need to buy extra collets to fill in - or go one way or the 
other from the start!
http://cgi.ebay.co.uk/ER32-Collet-Set-12-Piece-MT3-Metric_W0QQitemZ320199826872QQihZ011QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262

Hope that helps without adding to any confusion!
rgds
Hugh

"Kevin(Bluey)"  wrote in message 
news:IO6dnR6_mOOkzfHVRVnyiwA@westnet.com.au...
> Hi ,
> I have been surfing sites like Chronos , RDG and RHR looking for some 
> tooling and I noticed the number of different collets available ,
> this is leading to some confusion on my behalf.
>
>  Just wondering why there are so many differnt collets , there are ER 32, 
> ER35, ER40 etc and probably a heap more that I have not seen or heard off 
> .
> What are differences and advantages one over the other.?
>
> The ones I remember from my trade days were threaded and were drawn into 
> the lathe spindle using a draw bar and hand wheel on the out board end of 
> the spindle.
> (Hope I'm not telling my age here.)
>
> I'm not looking to buy any , as I have a full set of what I think are 
> Myford collets and a chuck that came with the Super 7 . There is one "ring 
> in" in the set it has Hardinge stamped on it and is slightly different in 
> the profile (concave)on the front face.
> I don't use them a lot ,but if you are machining lots of parts from small 
> diameters they would make life easier.
>
> Thanks .
> -- 
> Kevin (Bluey)
> "I'm not young enough to know everything."
>
> bluey69@west.net.com.au

On 6 Jul, 10:52, "Hugh"  wrote:
> hello Kevin,
> just one thing to point out - although each closes down by up to 1mm - it a
> good idea at the outset to decide if you are 'imperial or metric' - it isn't
> true to say that a set will hold all cutting tools within the range of the
> set.
> If you look at the link below, you will see that the 14mm collet will close
> down to 13mm, but the next one down is a 12mm collet - so there isn't a
> collet to hold a 1/2" tool - ditto 1/4".
> So you might need to buy extra collets to fill in - or go one way or the
> other from the start!http://cgi.ebay.co.uk/ER32-Collet-Set-12-Piece-MT3-Metric_W0QQitemZ32...
>
> Hope that helps without adding to any confusion!
> rgds
> Hugh
>
> "Kevin(Bluey)"  wrote in message
>
> news:IO6dnR6_mOOkzfHVRVnyiwA@westnet.com.au...
>
>
>
> > Hi ,
> > I have been surfing sites like Chronos , RDG and RHR looking for some
> > tooling and I noticed the number of different collets available ,
> > this is leading to some confusion on my behalf.
>
> >  Just wondering why there are so many differnt collets , there are ER 32,
> > ER35, ER40 etc and probably a heap more that I have not seen or heard off
> > .
> > What are differences and advantages one over the other.?
>
> > The ones I remember from my trade days were threaded and were drawn into
> > the lathe spindle using a draw bar and hand wheel on the out board end of
> > the spindle.
> > (Hope I'm not telling my age here.)
>
> > I'm not looking to buy any , as I have a full set of what I think are
> > Myford collets and a chuck that came with the Super 7 . There is one "ring
> > in" in the set it has Hardinge stamped on it and is slightly different in
> > the profile (concave)on the front face.
> > I don't use them a lot ,but if you are machining lots of parts from small
> > diameters they would make life easier.
>
> > Thanks .
> > --
> > Kevin (Bluey)
> > "I'm not young enough to know everything."
>
> > blue...@west.net.com.au- Hide quoted text -
>
> - Show quoted text -


Hugh

Correct for the "part" set that you provided a link for but the normal
"full" set for ER32 includes 18 collets and does cover the full range
and the ER 25 full set includes 15 collets and does likewise.

http://www.chronos.ltd.uk/acatalog/Chronos_Catalogue_Sets_of_ER_Collets_131.html

Regards

Keith

from "Hugh" 

> hello Kevin,
> just one thing to point out - although each closes down by up to 1mm - it a 
> good idea at the outset to decide if you are 'imperial or metric' - it
> isn't 
> true to say that a set will hold all cutting tools within the range of the 
> set.
> If you look at the link below, you will see that the 14mm collet will close 
> down to 13mm, but the next one down is a 12mm collet - so there isn't a 
> collet to hold a 1/2" tool - ditto 1/4".
> So you might need to buy extra collets to fill in - or go one way or the 
> other from the start!
> http://cgi.ebay.co.uk/ER32-Collet-Set-12-Piece-MT3-Metric_W0QQitemZ320199826872QQihZ011QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262

> Hope that helps without adding to any confusion!

It will cause confusion in-as-much-as the information is incorrect (I'm
sure many others on the group will also reply). ER collets are made to
cover the complete range of potential capacity. In the case of ER32 that
is 2mm to 20mm.

The eBay item cited is a set of 12 whereas the complete range would be a
set of 21.

JG

"Hugh"  wrote in message 
news:YNidneGpWNd0CO3V4p2dnAA@bt.com...
> hello Kevin,
> just one thing to point out - although each closes down by up to 1mm - it 
> a good idea at the outset to decide if you are 'imperial or metric' - it 
> isn't true to say that a set will hold all cutting tools within the range 
> of the set.
> If you look at the link below, you will see that the 14mm collet will 
> close down to 13mm, but the next one down is a 12mm collet - so there 
> isn't a collet to hold a 1/2" tool - ditto 1/4".
> So you might need to buy extra collets to fill in - or go one way or the 
> other from the start!
> http://cgi.ebay.co.uk/ER32-Collet-Set-12-Piece-MT3-Metric_W0QQitemZ320199826872QQihZ011QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262

However
http://tinyurl.com/6qjjws
Shows enough to cover the whole range from 1 to 20mm

Henry

On Sun, 6 Jul 2008 10:52:49 +0100, "Hugh" 
wrote:

>hello Kevin,
>just one thing to point out - although each closes down by up to 1mm - it a 
>good idea at the outset to decide if you are 'imperial or metric' - it isn't 
>true to say that a set will hold all cutting tools within the range of the 
>set.
>If you look at the link below, you will see that the 14mm collet will close 
>down to 13mm, but the next one down is a 12mm collet - so there isn't a 
>collet to hold a 1/2" tool - ditto 1/4".
>So you might need to buy extra collets to fill in - or go one way or the 
>other from the start!
>http://cgi.ebay.co.uk/ER32-Collet-Set-12-Piece-MT3-Metric_W0QQitemZ320199826872QQihZ011QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262
>
>Hope that helps without adding to any confusion!
>rgds
>Hugh
>

Dammit!
That must mean that my 13mm-12mm ER32 must have been incorrectly laser
marked then , as it grips 1/2" perfectly<VBG>.

One point worth mentioning, although each collet has a full 1mm range,
they have more gripping power close to the larger end of the size than
the smaller end.
There is information relating to this somewhere on the Rego-Fix site.

Peter

On Sun, 06 Jul 2008 12:08:56 +0100, Peter Neill 
wrote:


>
>One point worth mentioning, although each collet has a full 1mm range,
>they have more gripping power close to the larger end of the size than
>the smaller end.
>There is information relating to this somewhere on the Rego-Fix site.
>
>Peter


Given that I've go 65 imperial 5C collets and 25 metric ones and  would still
struggle with off sizes, one could stump up for a set of half sizes and still
be ahead of the game (if anyone sold them)


Mark Rand
RTFM

On Sun, 06 Jul 2008 14:58:48 +0100, Mark Rand
 wrote:

>On Sun, 06 Jul 2008 12:08:56 +0100, Peter Neill 
>wrote:
>
>
>>
>>One point worth mentioning, although each collet has a full 1mm range,
>>they have more gripping power close to the larger end of the size than
>>the smaller end.
>>There is information relating to this somewhere on the Rego-Fix site.
>>
>>Peter
>
>
>Given that I've go 65 imperial 5C collets and 25 metric ones and  would still
>struggle with off sizes, one could stump up for a set of half sizes and still
>be ahead of the game (if anyone sold them)
>
>
>Mark Rand
>RTFM

I was scratching my head wondering how you were using 5Cs on a Myford,
then I remembered that you bought a CVA didn't you?

Peter

On 6 Jul, 17:59, Peter Neill  wrote:
> On Sun, 06 Jul 2008 14:58:48 +0100, Mark Rand
>
>
>
>  wrote:
> >On Sun, 06 Jul 2008 12:08:56 +0100, Peter Neill 
> >wrote:
>
> >>One point worth mentioning, although each collet has a full 1mm range,
> >>they have more gripping power close to the larger end of the size than
> >>the smaller end.
> >>There is information relating to this somewhere on the Rego-Fix site.
>
> >>Peter
>
> >Given that I've go 65 imperial 5C collets and 25 metric ones and  would still
> >struggle with off sizes, one could stump up for a set of half sizes and still
> >be ahead of the game (if anyone sold them)
>
> >Mark Rand
> >RTFM
>
> I was scratching my head wondering how you were using 5Cs on a Myford,
> then I remembered that you bought a CVA didn't you?
>
> Peter

have you missed the HLV rebuild saga? I assume thats where they'll be
used,
assuming its finished ;)

Dave

On Sun, 6 Jul 2008 10:49:15 -0700 (PDT), dave sanderson
 wrote:

>On 6 Jul, 17:59, Peter Neill  wrote:
>> On Sun, 06 Jul 2008 14:58:48 +0100, Mark Rand
>>
>>
>>
>>  wrote:
>> >On Sun, 06 Jul 2008 12:08:56 +0100, Peter Neill 
>> >wrote:
>>
>> >>One point worth mentioning, although each collet has a full 1mm range,
>> >>they have more gripping power close to the larger end of the size than
>> >>the smaller end.
>> >>There is information relating to this somewhere on the Rego-Fix site.
>>
>> >>Peter
>>
>> >Given that I've go 65 imperial 5C collets and 25 metric ones and  would still
>> >struggle with off sizes, one could stump up for a set of half sizes and still
>> >be ahead of the game (if anyone sold them)
>>
>> >Mark Rand
>> >RTFM
>>
>> I was scratching my head wondering how you were using 5Cs on a Myford,
>> then I remembered that you bought a CVA didn't you?
>>
>> Peter
>
>have you missed the HLV rebuild saga? I assume thats where they'll be
>used,
>assuming its finished ;)
>
>Dave

With interest, but I got that wrong didn't I? 
It was Charles who got the CVA

Peter

On Sun, 06 Jul 2008 19:24:22 +0100, Peter Neill
 wrote:

>On Sun, 6 Jul 2008 10:49:15 -0700 (PDT), dave sanderson
> wrote:
>
>>On 6 Jul, 17:59, Peter Neill  wrote:
>>> On Sun, 06 Jul 2008 14:58:48 +0100, Mark Rand
>>>
>>>
>>>
>>>  wrote:
>>> >On Sun, 06 Jul 2008 12:08:56 +0100, Peter Neill 
>>> >wrote:
>>>
>>> >>One point worth mentioning, although each collet has a full 1mm range,
>>> >>they have more gripping power close to the larger end of the size than
>>> >>the smaller end.
>>> >>There is information relating to this somewhere on the Rego-Fix site.
>>>
>>> >>Peter
>>>
>>> >Given that I've go 65 imperial 5C collets and 25 metric ones and  would still
>>> >struggle with off sizes, one could stump up for a set of half sizes and still
>>> >be ahead of the game (if anyone sold them)
>>>
>>> >Mark Rand
>>> >RTFM
>>>
>>> I was scratching my head wondering how you were using 5Cs on a Myford,
>>> then I remembered that you bought a CVA didn't you?
>>>
>>> Peter
>>
>>have you missed the HLV rebuild saga? I assume thats where they'll be
>>used,
>>assuming its finished ;)
>>
>>Dave
>
>With interest, but I got that wrong didn't I? 
>It was Charles who got the CVA
>
>Peter

Yup. I thought about a Hardinge but went for a CVA.

Charles

Peter Neill wrote:
> On Sun, 6 Jul 2008 10:52:49 +0100, "Hugh" 
> wrote:
> 
>> hello Kevin,
>> just one thing to point out - although each closes down by up to 1mm - it a 
>> good idea at the outset to decide if you are 'imperial or metric' - it isn't 
>> true to say that a set will hold all cutting tools within the range of the 
>> set.
>> If you look at the link below, you will see that the 14mm collet will close 
>> down to 13mm, but the next one down is a 12mm collet - so there isn't a 
>> collet to hold a 1/2" tool - ditto 1/4".
>> So you might need to buy extra collets to fill in - or go one way or the 
>> other from the start!
>> http://cgi.ebay.co.uk/ER32-Collet-Set-12-Piece-MT3-Metric_W0QQitemZ320199826872QQihZ011QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262
>>
>> Hope that helps without adding to any confusion!
>> rgds
>> Hugh
>>
> 
> Dammit!
> That must mean that my 13mm-12mm ER32 must have been incorrectly laser
> marked then , as it grips 1/2" perfectly<VBG>.
> 
> One point worth mentioning, although each collet has a full 1mm range,
> they have more gripping power close to the larger end of the size than
> the smaller end.
> There is information relating to this somewhere on the Rego-Fix site.
> 
> Peter

My Hardinge collets are imperial by 1/64ths, the full set has never left me 
short of a collet of the right size. Though an exact fit will always give you 
the very best grip of course.

I hate to think about how many years it took me to afford the full set for the 
lever operated collet, but have never regretted it.

-- 
Karen

If you can't be a good example, then you'll just have to be a horrible warning.' 
Catherine Aird

Dragon Wrote: 
> 
> However
> http://tinyurl.com/6qjjws
> Shows enough to cover the whole range from 1 to 20mm
> 
> Henry

Be careful of these direct from Hong Kong sales.
Read the current feedback, some is in other languages but the trend is
for customs to start checking these parcels.

When you get hit with a VAT and duty bill plus no redress on faulty
goods it's a risk you have to take. Fine on a £2 laser pointer but on
precision gear I'd like to see what I'm buying.

There is still some rubbish out there and it's bound to filter down to
the lowest priced goods. At least with Warco, Chronos and Arc you do
have some redress.

P Riedie.


-- 
P Riedie
------------------------------------------------------------------------
P Riedie's Profile: http://www.rcgroups.com/forums/member.php?u=145351
View this thread: http://www.rcgroups.com/forums/showthread.php?t=888450

I was about to put some imperial F type collets on eBay, but (not 
knowing anything about this type of collet) I assume that I need to do 
more than just say "F type". Can anyone enlighten me about the critical 
dimensions for sub-types?

If anyone's interested in them they were made by Perfos.
3 sizes: 1/2, 9/16, 5/8.

Dave

> Be careful of these direct from Hong Kong sales.
> Read the current feedback, some is in other languages but the trend is
> for customs to start checking these parcels.
>
> When you get hit with a VAT and duty bill plus no redress on faulty
> goods it's a risk you have to take. Fine on a £2 laser pointer but on
> precision gear I'd like to see what I'm buying.

Thanks for the pointer though I was not about to purchase and used the link 
to demonstrate the full range.

I used the EBay negative feedback site to check the supplier I quoted.
It seems folks are content with the collets but got caught by 'officialdom' 
which pushed up the cost.
Also seems the supplier is not communicative.

Henry

Dragon wrote:
>> Be careful of these direct from Hong Kong sales.
>> Read the current feedback, some is in other languages but the trend is
>> for customs to start checking these parcels.
>>
>> When you get hit with a VAT and duty bill plus no redress on faulty
>> goods it's a risk you have to take. Fine on a £2 laser pointer but on
>> precision gear I'd like to see what I'm buying.
> 
> Thanks for the pointer though I was not about to purchase and used the link 
> to demonstrate the full range.
> 
> I used the EBay negative feedback site to check the supplier I quoted.
> It seems folks are content with the collets but got caught by 'officialdom' 
> which pushed up the cost.
> Also seems the supplier is not communicative.
> 
> Henry 
> 
> 

Keep the price below £18 and there is no VAT - actually it's the £8 (PO) 
or £10 (DHL) charge for collecting the VAT which gets you, not the VAT 
itself.

There are two or three HK sellers, they seem communicative enough though 
they don't reply to "it isn't here yet" comments until several weeks 
have passed. You have to be patient.


Not the world's best quality, but everything I have bought has been 
perfectly adequate - and the price is right.

-- Peter Fairbrother

Yes Peter that's true about the VAT and the £18 limit and this will
cover some of the cheaper articles but when you get into the realms of
collet chucks and sets of collets the £18 limit doesn't apply.

I bought two pipe centres, even though the seller agreed to combine
postage he didn't as that is where they make up some profit. Both
centres were absolute junk you could see the wobble spinning them by
hand. No contact afterwards other than a cryptic remark "Why you not
tell us ?"

I left negative feed back and at this time the seller was also able to,
they gave me negative feedback saying I hadn't contacted them.

So by the time I had paid two lots of shipping, two lots of VAT, two
lots of handling just to throw these in the bin proved a costly
experience that I'm not prepared to undertake again.

I replaced one from Chester and one from Chronos at Warwick last year
and finished up paying less than Mr Hong Kong Wong charged and got
better value to boot.

PR.


-- 
P Riedie
------------------------------------------------------------------------
P Riedie's Profile: http://www.rcgroups.com/forums/member.php?u=145351
View this thread: http://www.rcgroups.com/forums/showthread.php?t=888450

P Riedie wrote:
> Yes Peter that's true about the VAT and the £18 limit and this will
> cover some of the cheaper articles but when you get into the realms of
> collet chucks and sets of collets the £18 limit doesn't apply.

FULL ER25 COLLET SET
http://cgi.ebay.co.uk/FULL-ER25-COLLET-SET-15-PCS-CNC-MILLING-LATHE-NEW-A05_W0QQitemZ120273119058QQcmdZViewItem?_trksid=p3286.m20.l1116
£16.50

There's usually a better and slightly cheaper 13-piece set too.

ER32 COLLET SET (10 PCS)
http://cgi.ebay.co.uk/ER32-COLLET-SET-10-PCS-CNC-MILLING-LATHE-NEW-A06_W0QQitemZ120277987929QQcmdZViewItem?hash=item120277987929&_trkparms=72%3A12%7C39%3A1%7C65%3A12&_trksid=p3286.c0.m14
£13.00

ER25 and ER32 collets chucks, in straight shank, MT2, MT3, R8,  are 
widely available for less than a tenner.

You have to add postage, but for light things, especially ER25 collet 
sets, the price is still remarkably low. Don't combine postage where it 
takes the total price over £18 though!

I have bought half a dozen ER chucks and sets, from 3 different HK 
sellers - they are all of acceptable quality. And cheap as ninepence.

No guarantees, YMMV

-- Peter Fairbrother


> 
> I bought two pipe centres, even though the seller agreed to combine
> postage he didn't as that is where they make up some profit. Both
> centres were absolute junk you could see the wobble spinning them by
> hand. No contact afterwards other than a cryptic remark "Why you not
> tell us ?"
> 
> I left negative feed back and at this time the seller was also able to,
> they gave me negative feedback saying I hadn't contacted them.
> 
> So by the time I had paid two lots of shipping, two lots of VAT, two
> lots of handling just to throw these in the bin proved a costly
> experience that I'm not prepared to undertake again.
> 
> I replaced one from Chester and one from Chronos at Warwick last year
> and finished up paying less than Mr Hong Kong Wong charged and got
> better value to boot.
> 
> PR.
> 
>