Question Re Camlock Chuck Fixings

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Question Re Camlock Chuck Fixings

This topic has 9 replies, 6 voices, and was last updated 7 May 2022 at 22:36 by Pete Rimmer.

Viewing 10 posts - 1 through 10 (of 10 total)

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28 April 2022 at 16:30 #14545
Colin Heseltine
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@colinheseltine48622
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28 April 2022 at 16:30 #596205
Colin Heseltine
Participant
@colinheseltine48622
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,

Thanks,

Colin
28 April 2022 at 16:35 #596207
Chris Evans 6
Participant
@chrisevans6
Are the advertised back plates just showing a generic picture of a cam lock and not the actual article ?
28 April 2022 at 17:04 #596213
Dave S
Participant
@daves59043
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
28 April 2022 at 17:09 #596214
Dave S
Participant
@daves59043
A small amount of poking later : **LINK**

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

Dave
28 April 2022 at 17:14 #596215
Pete Rimmer
Participant
@peterimmer30576
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.
28 April 2022 at 17:49 #596219
Henry Brown
Participant
@henrybrown95529
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
28 April 2022 at 17:58 #596220
Roger Williams 2
Participant
@rogerwilliams2
Hello, I purchased my D16 backplate from Chronos , excellent quality and 6 pins , for an E40 collet chuck adaption. Good service too.
7 May 2022 at 20:30 #597361
Colin Heseltine
Participant
@colinheseltine48622
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.

Thanks,

Colin
7 May 2022 at 22:36 #597376
Pete Rimmer
Participant
@peterimmer30576
L0 chucks sell quite readily. I don't think you'll struggle with that.
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