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Question Re Camlock Chuck Fixings

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Colin Heseltine28/04/2022 16:30:11
661 forum posts
230 photos

I have recently swapped out my Colchester Student lathe with L0 chuck fixing and replaced it with a Colchester Triumph 2000 which has D1-6 chuck mount on the spindle. I have the standard 12" 4 jaw, and 8" 3 jaw chucks as well as a Burnerd Multisize chuck.

I had a 6" Burnerd GripTru chuck on the Student which has a backplate with the L0 fixing. I wish to be able to use this on the new lathe and so need to replace the L0 backplate with a D1-6 camlock backplate. I have been looking on Ebay and there are quite a few D1-6 camlock backplates available for chucks around the 6" to 8" diameter range but they all appear to only have 3 camlock pins rather that the full 6. Can a 3 pin fixed chuck work as safely as a 6 pin mounted one? The only 6 pin one I can see on the market at a reasonable price is that marketed by RDG, although that ideally needs turning down from the supplied 200mm to be closer to the required 6" diameter.

Any thoughts,



Chris Evans 628/04/2022 16:35:16
2057 forum posts

Are the advertised back plates just showing a generic picture of a cam lock and not the actual article ?

Dave S28/04/2022 17:04:21
370 forum posts
90 photos

IIRC the late Sir John Stevenson of this parish used to run D1-6 with only 3 pins in it.

The pins pull the taper together. 3 is most likely sufficient for most uses.

Somewhere on the internet (might be the home shop machinist bbs site) there is a long discussion about this and how 3 pins are plenty enough based on the strength of them.


Dave S28/04/2022 17:09:10
370 forum posts
90 photos

A small amount of poking later : **LINK**

John was running D1-5 not 6, but the principal is the same


Pete Rimmer28/04/2022 17:14:34
1233 forum posts
65 photos

My 8" 3 jaw is held by three D1-3 pins. I see no problem with holding the same size chuck with 3 of the much stronger D1-6 pins.

Henry Brown28/04/2022 17:49:05
552 forum posts
117 photos

I use a 250mm ( 9.75" ) on 3 x D1-4 pegs on my Warco GH 1332 without issue so you should be fine.

Edited By Henry Brown on 28/04/2022 17:49:46

Roger Williams 228/04/2022 17:58:03
346 forum posts
3 photos

Hello, I purchased my D16 backplate from Chronos , excellent quality and 6 pins , for an E40 collet chuck adaption. Good service too.

Colin Heseltine07/05/2022 20:30:07
661 forum posts
230 photos

Thanks for the responses. I had hoped to put my 6" Griptru chuck onto the D1-6 backplate. When I tried to remove what I thought was the L0 backplate, I very quickly found that it was an integral part of the chuck. Oh well, that is another chuck I need to try and sell along with my Burnerd Multisize collet chuck.



Pete Rimmer07/05/2022 22:36:38
1233 forum posts
65 photos

L0 chucks sell quite readily. I don't think you'll struggle with that.

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