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is this able to be separated or do i have to cut it off

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Martin Newbold15/12/2018 14:01:50
415 forum posts
240 photos

Hi I have just bought a new project a 5" chuck which I have separated. But is now connected to back of chuck should this come off or will I need to part it. It is from a 5" Bernard chuck which was camlock. Has anyone taken one of these apart before?

Thanks for looking. Cheers

20181215_134129.jpg

Martin Newbold15/12/2018 14:30:25
415 forum posts
240 photos

I thought it should be like this one ?20181215_142001.jpg

Howard Lewis15/12/2018 14:33:32
1945 forum posts
2 photos

Presumably, you wish to use the chuck on a machine which does not have a camlock facility? Otherwise, why bother?

By the looks of your picture, there are still two parts there, (visible in the centre and below the body proper) the body, which carries the three pinions, and a backplate.

Are there any tappings into blind holes? If YES, then setscrews (jacking screws) can be screwed in, and progressively tightened to push the backplate off the body. If there are no such tappings, you should be able to produce three, for the task.

Howard

Martin Newbold15/12/2018 19:36:59
415 forum posts
240 photos

Hi Howard yes there are three Alan bolts down the side of each of the pinons . The pinons screw in to the bottom plate as does the Alan bolt all removed its sitting on a new back plate as I do not have a cam lock lathe. I am wondering whether it is two parts pressed together and maybe need a press to part them or whether it is in one part and to part it of on the lathe.

 

Thanks for looking

Edited By Martin Newbold on 15/12/2018 19:42:02

Pete Rimmer15/12/2018 20:56:59
316 forum posts
7 photos

I had one of those exact same chucks. The piece you have there is one whole casting so the camlock fitting is integral to the chuck. Mine was ruined when I got it, the front was deformed so the jaws were bell-mouthed. I scrapped the front, used the perfectly good jaws in another chuck and made a camlock backplate out the the rear section. It's now a collet chuck for OZ15 collets.

Martin Newbold15/12/2018 22:12:46
415 forum posts
240 photos

Pete ,

Hi, Sounds like your conversion was a good one

Thanks but its a bit strange as the Allen bolts seem to be passing through the back plate and are tapped into the top image top part which fits inside the chuck. I felt it should separate . The back plate of the Chuck was really hard to get apart and I wondered if its the same here which this item pictured . The chuck is a Pratt Burnerd Catalogue Number 1212 31305. If its one piece why would it need three Allen bolts and three pinions passing through the cam lock back plate and the Allen threads & pinion threads right into it . I also notice that the center three Allen bolts that normally bolt that cover to the chuck were not drilled which is odd.

The chuck is no longer attached to it and came apart with some difficulty, but looks like any normal Burnerd chuck inards. I could mount as is onto my new plate as is but this would be better to retrieve and either part of in the lathe or push apart. I am considering re-drilling the plate securing holes and . Then put the pinions in on a few threads and position this over the new plate and use a large cramp to put pressure on it to see if it will part.


Thanks for looking

Edited By Martin Newbold on 15/12/2018 22:23:29

Pete Rimmer15/12/2018 23:05:44
316 forum posts
7 photos

Mine was like your top one. If I remember correctly it had long bolts through from the front holding the halves together. I had to loosen those bolts, fit longer ones and tap them in to drift the back half off - It was very snug.

I might be reading the image wrong but it looks like someone has taken a D1-3 camlock chuck and fitted a threaded backplate onto it. Are you saying that there are no bolts coming in from the rear face?

Martin Newbold16/12/2018 11:21:08
415 forum posts
240 photos

Hi Pete, thanks for responding . Yes the front of the chuck had Alan bolts through it into the threads in rear plate . I was referring to the rear of the chuck which usually has three threads in back to fix backing plate . These had not been drilled in back plate . The threads go right into the back piece and pass through the front with no threading

20181216_111552.jpg

You can see the are not threaded right through suggesting its two parts

20181216_111527.jpg

Edited By Martin Newbold on 16/12/2018 11:34:15

Pete Rimmer16/12/2018 11:43:36
316 forum posts
7 photos

I'm not sure I'm following you - I don't see any un-threaded holes. Your last two pics look exactly how they should. The three outside holes are threaded for the front bolts. The bigger holes with the sunken threads are for the camlock pins. The smaller threaded holes are for the pin retaining bolts.

Martin Newbold16/12/2018 12:07:35
415 forum posts
240 photos

Pete , thanks for replying, if you look at my last pic then you will see a centre lower stepped circle area normally this would have thee holes to mount it as a back plate to the chuck body. They are absent.

If you look at the holes on this last image you will see no thread on front backplate and on first image in last message 16/12/2018 11:21:08 you can see the thread and the towers the pinions screw into which are square on back which would allow it to be secured if it was in two parts

Martin Newbold16/12/2018 12:21:01
415 forum posts
240 photos

I think you might be right that its one piece . I put in the pinions and put a g cram around this and a plate to see if i could wind it out it never even stated to move . So guess I will have to cut it off in lathe. I will have to make up some brass bushes and a flanged bot to spin it .

 

Edited By Martin Newbold on 16/12/2018 12:31:47

Martin Newbold19/12/2018 11:12:42
415 forum posts
240 photos

I started cutting with an angle grinder with a stainless blade this has got me half way . I need to decide which parting tool to buy to get me through the rest. cheers

Thanks for looking

Martin Newbold21/12/2018 15:42:13
415 forum posts
240 photos

Ok its off now was quite hard material but my cobalt toll and a disk cutter did the job ok

 

dscn8720.jpg

Edited By Martin Newbold on 21/12/2018 15:44:05

Martin Newbold23/12/2018 12:00:44
415 forum posts
240 photos

Here is two parts separated. I have no use for bottom half as only require the part that fits into the chuck

dscn8722.jpg

Edited By Martin Newbold on 23/12/2018 12:00:57

Pete Rimmer23/12/2018 12:08:35
316 forum posts
7 photos

If you're scrapping the backplate I could use the pins Martin, happy to pay a nominal amount for them.

How do you plan to secure the section you cut off to the front half of the chuck?

Martin Newbold23/12/2018 21:03:02
415 forum posts
240 photos

No longer required anyone interested. The chuck has three threads as its a Burnard & Pratt I intend on drilling the holes and retro fitting machine screwsNo Longer required

Martin Newbold23/12/2018 21:09:53
415 forum posts
240 photos

This is the rear of another Bernard and Pratt I will be fixing my new back plate in the same way. The chuck has these threads as standard I just need to drill the plate to fit it. Am still looking for a 1" x 10TPI backplate for this one

dscn8726.jpg

Martin Newbold26/12/2018 10:21:56
415 forum posts
240 photos

Haave fitted fron piece into chuck just need to drill holes for machine screws. Does anyone know what size they are?

dscn8727.jpg

Martin Newbold28/12/2018 15:35:11
415 forum posts
240 photos

Have drilled new holes in backplate but have ordered screws to fit not sure when they will arrive

Martin Newbold29/12/2018 12:46:04
415 forum posts
240 photos

dscn8728.jpg

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