As subject. Bench drill seems to be very vibey ? is there an adjustment
on a Sip bench drill to make sure the drill chuck is running true. Any
other reasons why i'd end up with a trianguar hole in thin sheet stock
? Drill bit is new (6mm) and is sharp and good quality.

Thanks

Paul.

Any

> other reasons why i'd end up with a trianguar hole in thin sheet stock
> ? Drill bit is new (6mm) and is sharp and good quality.
> 
> Thanks
> 
> Paul.


Drilling too fast ?

Dave

wrote in message 
news:1125756831.640483.299500@g47g2000cwa.googlegroups.com...

> As subject. Bench drill seems to be very vibey ? is there an adjustment
> on a Sip bench drill to make sure the drill chuck is running true. Any
> other reasons why i'd end up with a trianguar hole in thin sheet stock
> ? Drill bit is new (6mm) and is sharp and good quality.
>
> Thanks
>
> Paul.
>


Are you using Sheet Metal Drills?

zymurgy@technologist.com wrote:


> As subject. Bench drill seems to be very vibey ? is there an adjustment
> on a Sip bench drill to make sure the drill chuck is running true. Any
> other reasons why i'd end up with a trianguar hole in thin sheet stock


Do you have something behind the steel to drill into? A block of MDF is 
good. Otherwise the sheet will just tend to catch as the drill breaks 
through and then spiral onto the bit. This gives the characteristic 
triangular hole you describe.

-- 
Cheers,

John.

/=================================================================\
|          Internode Ltd -  http://www.internode.co.uk            |
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|        John Rumm - john(at)internode(dot)co(dot)uk              |
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On 3 Sep 2005 07:13:51 -0700, zymurgy@technologist.com wrote:


>As subject. Bench drill seems to be very vibey ? is there an adjustment
>on a Sip bench drill to make sure the drill chuck is running true. Any
>other reasons why i'd end up with a trianguar hole in thin sheet stock
>? Drill bit is new (6mm) and is sharp and good quality.
>
>Thanks
>
>Paul.



It sounds like the workpiece is moving around, Paul.

Do you have it firmly clamped down and on a block of wood to back it
up?

Is hte speed correct for the drill size and meterial?

If there's a lot of vibration when just running and the chuck looks
out of true, check to see if it can be removed (i.e. has a Morse taper
etc).   It may be that there is a piece of machining crud lodged in
there, so try cleaning thoroughly and reseating.   Do this by locating
the chuck, rest it on a piece of wood and steadily pull the handle to
apply pressure.


-- 

..andy

To email, substitute .nospam with .gl

wrote in message 
news:1125756831.640483.299500@g47g2000cwa.googlegroups.com...

> As subject. Bench drill seems to be very vibey ? is there an adjustment
> on a Sip bench drill to make sure the drill chuck is running true. Any
> other reasons why i'd end up with a trianguar hole in thin sheet stock
> ? Drill bit is new (6mm) and is sharp and good quality.


Although you say the drill is sharp, triangular holes are characteristic of 
a two-flute drill that is slightly blunt.

Colin Bignell

"nightjar .uk.com>" <nightjar@<insert my surname here> wrote in message 
news:yYKdncLk2OgwJoTeRVnyjQ@giganews.com...

>
>  wrote in message 
> news:1125756831.640483.299500@g47g2000cwa.googlegroups.com...
>> As subject. Bench drill seems to be very vibey ? is there an adjustment
>> on a Sip bench drill to make sure the drill chuck is running true. Any
>> other reasons why i'd end up with a trianguar hole in thin sheet stock
>> ? Drill bit is new (6mm) and is sharp and good quality.
>
> Although you say the drill is sharp, triangular holes are characteristic 
> of a two-flute drill that is slightly blunt.
>
> Colin Bignell
>

A sharp drill bit can tend to 'grab' and give a triangular hole. When I was 
a toolmaker we had a dodge - too complex to describe but it gave the bit 
less of a positive rake (not clearance).
Best to clamp the sheet between two sheets of MDF - this will stop the sheet 
from lifting. The pillar drill spindle is probably too light to resist being 
pulled and vinrating as the drill break through.

John

john wrote:

> nightjar wrote
> > zymurgy wrote
> >> As subject. Bench drill seems to be very vibey ? is there an adjustment
> >> on a Sip bench drill to make sure the drill chuck is running true. Any
> >> other reasons why i'd end up with a trianguar hole in thin sheet stock
> >> ? Drill bit is new (6mm) and is sharp and good quality.
> >
> > Although you say the drill is sharp, triangular holes are characteristic
> > of a two-flute drill that is slightly blunt.
> >
> > Colin Bignell
> >
> A sharp drill bit can tend to 'grab' and give a triangular hole. When I was
> a toolmaker we had a dodge - too complex to describe but it gave the bit
> less of a positive rake (not clearance).
> Best to clamp the sheet between two sheets of MDF - this will stop the sheet
> from lifting. The pillar drill spindle is probably too light to resist being
> pulled and vibrating as the drill break through.


Thanks for all the replies. Food for thought. Will try to recentre the
chuck, use a backing board and hold the work more firmly [1] !

Cheers

Paul.

[1] Was just wearing leather gauntlets, as it was a sheet of steel and
not so easy to clamp down ..

On 3 Sep 2005 09:42:52 -0700, zymurgy@technologist.com wrote:



>
>Thanks for all the replies. Food for thought. Will try to recentre the
>chuck, use a backing board and hold the work more firmly [1] !
>
>Cheers
>
>Paul.
>
>[1] Was just wearing leather gauntlets, as it was a sheet of steel and
>not so easy to clamp down ..


You could also try a dab of cutting fluid, Paul.


-- 

..andy

To email, substitute .nospam with .gl

On Sat, 03 Sep 2005 15:13:51 +0100,  wrote:


> As subject. Bench drill seems to be very vibey ? is there an adjustment
> on a Sip bench drill to make sure the drill chuck is running true. Any
> other reasons why i'd end up with a trianguar hole in thin sheet stock
> ? Drill bit is new (6mm) and is sharp and good quality.


Have you tried the cloth trick mentioned in the FAQ?

John Schmitt

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