I've decided to add a piston type quick change toolpost from Chronos (same 
as the Arc Euro one) to my Bantam 800 (MK1); the problem is that the current 
toolpost is retained by a large diameter clamping bolt (looks to be about 1 
1/4" or 32mm diameter) threaded into the top slide and there is no obvious 
way to mount the new toolpost, i.e. no T slots.
I thought about machining a threaded plug to go into the existing hole and 
locking it in somehow and mounting the new toolpost to that; any other 
suggestions?
Martin
-- 
martin<dot here>whybrow<at here>ntlworld<dot here>com

"Martin Whybrow"  wrote in message 
news:XX_kk.111697$wd5.68966@newsfe17.ams2...
> I've decided to add a piston type quick change toolpost from Chronos (same 
> as the Arc Euro one) to my Bantam 800 (MK1); the problem is that the 
> current toolpost is retained by a large diameter clamping bolt (looks to 
> be about 1 1/4" or 32mm diameter) threaded into the top slide and there is 
> no obvious way to mount the new toolpost, i.e. no T slots.
> I thought about machining a threaded plug to go into the existing hole and 
> locking it in somehow and mounting the new toolpost to that; any other 
> suggestions?
> Martin
> -- 
> martin<dot here>whybrow<at here>ntlworld<dot here>com
>
>
Well I described the topslide completely wrong; it has a tubular boss about 
1 1/4"mm diameter and perhaps 1 1/2" to 2" tall that the toolpost locates on 
and that is threaded to take the hold down bolt which is approximately 3/4" 
in diameter. I guess I'll need to bore the QCTP to receive this boss 
instead. If anyone's fitted one of these to a MK1 Bantam, please tell me how 
you did it!
Martin

Martin Whybrow wrote:
> "Martin Whybrow"  wrote in message 
> news:XX_kk.111697$wd5.68966@newsfe17.ams2...
>> I've decided to add a piston type quick change toolpost from Chronos (same 
>> as the Arc Euro one) to my Bantam 800 (MK1); the problem is that the 
>> current toolpost is retained by a large diameter clamping bolt (looks to 
>> be about 1 1/4" or 32mm diameter) threaded into the top slide and there is 
>> no obvious way to mount the new toolpost, i.e. no T slots.
>> I thought about machining a threaded plug to go into the existing hole and 
>> locking it in somehow and mounting the new toolpost to that; any other 
>> suggestions?
>> Martin
>> -- 
>> martin<dot here>whybrow<at here>ntlworld<dot here>com
>>
>>
> Well I described the topslide completely wrong; it has a tubular boss about 
> 1 1/4"mm diameter and perhaps 1 1/2" to 2" tall that the toolpost locates on 
> and that is threaded to take the hold down bolt which is approximately 3/4" 
> in diameter. I guess I'll need to bore the QCTP to receive this boss 
> instead. If anyone's fitted one of these to a MK1 Bantam, please tell me how 
> you did it!
> Martin 
> 
> 
Hi Martin,

Is that boss part of the topslide casting or maybe you can remove it and 
make up a more suitable part to fit?
Must admit I did not look that closely at the tool post when we 
collected the machines.
Bob

you may find that the toolpost is hardened so you won't be able to bore
it out. When I fitted my Dickson post onto my lathe I put the topslide
onto the mill and use a boring head to reduce the boss diameter as it
was just cast iron.

As has been said the boss may be removable, A T1 size Dickson post has
a 31.75mm counter bore but its only 6mm deep.

Jason


-- 
jasonballamy
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"Bob Minchin"  wrote in message 
news:xeglk.115612$wd5.34731@newsfe17.ams2...
> Martin Whybrow wrote:
>> "Martin Whybrow"  wrote in message 
>> news:XX_kk.111697$wd5.68966@newsfe17.ams2...
>>> I've decided to add a piston type quick change toolpost from Chronos 
>>> (same as the Arc Euro one) to my Bantam 800 (MK1); the problem is that 
>>> the current toolpost is retained by a large diameter clamping bolt 
>>> (looks to be about 1 1/4" or 32mm diameter) threaded into the top slide 
>>> and there is no obvious way to mount the new toolpost, i.e. no T slots.
>>> I thought about machining a threaded plug to go into the existing hole 
>>> and locking it in somehow and mounting the new toolpost to that; any 
>>> other suggestions?
>>> Martin
>>> -- 
>>> martin<dot here>whybrow<at here>ntlworld<dot here>com
>>>
>>>
>> Well I described the topslide completely wrong; it has a tubular boss 
>> about 1 1/4"mm diameter and perhaps 1 1/2" to 2" tall that the toolpost 
>> locates on and that is threaded to take the hold down bolt which is 
>> approximately 3/4" in diameter. I guess I'll need to bore the QCTP to 
>> receive this boss instead. If anyone's fitted one of these to a MK1 
>> Bantam, please tell me how you did it!
>> Martin
> Hi Martin,
>
> Is that boss part of the topslide casting or maybe you can remove it and 
> make up a more suitable part to fit?
> Must admit I did not look that closely at the tool post when we collected 
> the machines.
> Bob
I've had a better look today, the boss is part of the casting and it's 1 
1/2" in diameter and 1 5/8" tall. I probably should have looked a bit more 
closely before I bought the toolpost but I was getting fed up looking 
through my collection of packing trying to get on centre height with the 
assortment of tools I've got, most of which are more ML7 sized than Bantam 
sized.
The lathe's going well by the way, I'm gradually working my way through the 
list of missing or broken parts (not too many broken bits, thankfully).
Martin
-- 
martin<dot here>whybrow<at here>ntlworld<dot here>com