4 jaw chuck

Brento

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Jan 23, 2021
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So i am thinking of buying a 4 jaw for my Derbyshire Elect. I was thinking of buying one from sherline with a 1/2-13 thread on it. After that my thought was to make a 5/16 arbor with a 1/2-13 thread on it to screw into the chuck. Would that be okay to do?
 

Jerry Kieffer

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So i am thinking of buying a 4 jaw for my Derbyshire Elect. I was thinking of buying one from sherline with a 1/2-13 thread on it. After that my thought was to make a 5/16 arbor with a 1/2-13 thread on it to screw into the chuck. Would that be okay to do?
Brento
Without research, I believe the Derbyshire Elect is a 8mm lathe.

If so, a 8mm collet is essentially a pot collet with a short holding depth of less than .250".

This in turn would likely be unstable and less than accurate method of mounting a chuck. I would suggest one of Sherlines chuck arbors designed to fit 8mm and 10mm spindles depending on your lathes requirements per attached link.


Jerry Kieffer
 

Brento

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I didnt see those there! Thank you. It is a 10mm system though which would hold the 5/16
 

Brento

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Well i am in the US. But Jerry fixed my problem bc i didnt even see the adaptors for my lathe. I saw them at one point but forgot about them.
 

wefalck

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I got a whole bunch of chucks (the smaller and the larger 3-jaw and the centric 4-jaw) from Sherline together with the 8 mm adaptors some 20 years ago, but was not aware that they do 10 mm stuff too. I also use my original Lorch 3-jaw-chuck, but prefer the Sherline chucks for heavier or longer work due to the deeper jaws.
 

praezis

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RDG Tools in the UK offers a small selection of 10 mm spindle tooling including arbors with 12x1 mm and 14x1 mm threads:.
Just a question: will those 10mm collets offered for Pultra, also fit a 10mm Lorch?

Frank
 

wefalck

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Checked in my sources: the thread pitch would be the same, 1 mm (which is quite strange for a British-made lathe), but the OD of the thread seems to be slightly different, 9.2 mm for Lorch and 0.389" = 9.88 mm for Pultra. Also, de Carlè gives the overall length as 44.5 mm for Pultra, while my Ortlieb catalogue gives 74.5 mm for Lorch.

Probably with a different draw-tube Pultra collets could be used in a Lorch lathe. Not sure whether the location pin would be at the right place though. In a Lorch with longer collets it should be further back.
 

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