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Chuck

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Peter Love 114/03/2020 21:26:46
17 forum posts
3 photos

I was watching Abom 79 on Utube and saw this, one way of machining small items on a very large lathe.

Peter.lathe chuck.jpg

peak414/03/2020 21:33:11
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1190 forum posts
143 photos

I've even done that on the Myford, using a Simat chuck, but I did at least use all the jaws on the big one.

Bill

Paul Lousick14/03/2020 21:57:13
1541 forum posts
578 photos

Thats how I did the wheels for my engine to machine the inside of the rims where the park brake rubs. (They are 2 foot diameter). Holding a 3 jaw chuck in a 4 jaw chuck also allows you to easily centre it.

Paul

rear wheel machining.jpg

Steviegtr15/03/2020 14:13:16
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1495 forum posts
163 photos

Could I fit one of them to my Myford s7. laugh

Steve.

Howard Lewis15/03/2020 14:39:13
3605 forum posts
2 photos

So that's how preserved railways keep a wheel lathe in work, when business is slack!

Howard

Neil Wyatt15/03/2020 20:15:10
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Moderator
18232 forum posts
714 photos
77 articles

I've read reports of hard-steel chucks held in hard steel chuck jaws coming loose, so care needed.

Less risky with a CI chuck.

Neil

Nigel Bennett16/03/2020 13:56:03
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362 forum posts
11 photos

Similar to Bill, I've used Unimat chucks in both Myford & Boxford lathes; I turned up a flanged mild steel spigot with M14 x 1 thread on it and the setup is excellent for gripping little fiddly things that can't easily be held in bigger chucks.

Henry Brown16/03/2020 16:15:33
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296 forum posts
83 photos

We always used copper jaw pads to protect the small chuck and help avoid slippage...

peak416/03/2020 18:04:11
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1190 forum posts
143 photos
Posted by Nigel Bennett on 16/03/2020 13:56:03:

Similar to Bill, I've used Unimat chucks in both Myford & Boxford lathes; I turned up a flanged mild steel spigot with M14 x 1 thread on it and the setup is excellent for gripping little fiddly things that can't easily be held in bigger chucks.

Yes I did exactly that, on spec, at Doncaster show a couple of years ago, got it home then realised mine's a Simat, so 14x1.4mm blush

Yes, I've now made one that fits, the main advantage for me is that the jaws are smaller, so they fit and expand into smaller holes.

Bill

Bandersnatch17/03/2020 00:30:10
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1719 forum posts
60 photos

Is there any guarantee that the OD of a chuck is accurately concentric with the jaws?

Hopper17/03/2020 00:52:41
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4804 forum posts
105 photos
Posted by Bandersnatch on 17/03/2020 00:30:10:

Is there any guarantee that the OD of a chuck is accurately concentric with the jaws?

No. Always double check it. Its usually within a thou or three but no guarantee. 

Edited By Hopper on 17/03/2020 00:55:07

not done it yet17/03/2020 01:24:53
5010 forum posts
20 photos
Posted by Bandersnatch on 17/03/2020 00:30:10:

Is there any guarantee that the OD of a chuck is accurately concentric with the jaws?

Does it matter if there is a 4 jaw independent chuck involved?[

Bandersnatch17/03/2020 13:44:30
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1719 forum posts
60 photos

Good point!

Hard to tell from the first pic. The second looks like a 4-jaw though.

not done it yet17/03/2020 15:35:00
5010 forum posts
20 photos

First one looks like a self-centring 3 jaw in an independent 3 jaw.

mgnbuk17/03/2020 15:44:20
800 forum posts
61 photos

First one looks like a self-centring 3 jaw in an independent 3 jaw.

The main chuck seems to be an independant 2 jaw to me.

Nigel B.

Bandersnatch17/03/2020 15:45:58
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1719 forum posts
60 photos

ndiy ... but I can only see 1 jaw in the large chuck (despite blowing up the image). Certainly can't see a another regular jaw 120 deg from the visible one.

Perhaps it's using fixed preset stops in two slots and using a single jaw to tighten?

Edited By Bandersnatch on 17/03/2020 15:47:01

Keith Long17/03/2020 16:02:17
845 forum posts
11 photos

In the top picture it IS difficult to see but there is another jaw at 90 deg clockwise from the one that's obvious. You can just about make out the lines across the jaw steps if you look closely.Just ba pity it's all the same colour of muck and rust all over with flat frontal lighting.

Bandersnatch17/03/2020 16:09:41
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1719 forum posts
60 photos

Nice going, Keith - nothing wrong with your eyesight! If you import the pic into a graphics program and increase the brightness by 50% and the contrast (a bit) it pops right out .... along with suggestions of the other two jaws.

Like this (somewhat over-sharpened):

 

chuck.jpg

Edited By Bandersnatch on 17/03/2020 16:15:12

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