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Chuck

Chuck dilemma

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john brown 1724/01/2021 10:17:50
132 forum posts
3 photos

Was left a as new 4 jaw chuck on the door step from a chap up the road ,opened up the box with joy then now comes the dilemma its a TZU Sheng 4 jaw chuck with a 3/4 x 16tpi thread that have now found out is for a wood lathe ,now do l move it on or make an adapter an use it on the myford for light work its a very nice thin chuck and do not think over hang an weight would be a problem and being a 6" chuck would be useful at times ,will se what you experts think even for light duty.

john

Howard Lewis24/01/2021 10:25:47
4448 forum posts
8 photos

What sort of jaws does it have?

Wood lathes usually grip the work by moving outwards, where chucks for metal work move inwards to grip, and are reversible.

If suitable for metalworking, could you bore out the backplate and machine the thread and register for the Myford?

Howard.

john brown 1724/01/2021 10:41:20
132 forum posts
3 photos

Morning howard , the jaws are reversible but you have to have a gap at the back as the jaws have nuts as well as well sa go in and out with the key so no back plate as sort ,a dummy spindle coming off a back plate would be needed then it could be mounted to a myford plate ,hope that makes sence

john

Derek Lane24/01/2021 10:42:59
avatar
395 forum posts
83 photos

It may have a 3/4" X 16 but what type of jaws does it have. Yes older woodturning lathes used this thread up until recently where many lathes are now a 33mm thread. Have you a picture of the chuck

Howard woodturning chucks hold both in compression and expansion and many have various jaw designs which can be interchanged. The most common and safest is by compression as many tend to make the mistake of over tightening when used in expansion with some dangerous pieces of wood flying around when the lathe starts to turn and a tool applied. If in doubt about this I have been woodturning for 12years. Some of my work can be seen here

john brown 1724/01/2021 10:49:45
132 forum posts
3 photos

Right machine mart sell the same looking chuck for there range of wood lathes so you can se the jaws ,am not that great with the computor to put up a picture,hope this helps

Bo'sun24/01/2021 10:59:54
358 forum posts

If it's for woodturning, it's almost certainly going to be a self centring 4 jaw chuck.

Derek Lane24/01/2021 11:11:33
avatar
395 forum posts
83 photos
Posted by john brown 17 on 24/01/2021 10:49:45:

Right machine mart sell the same looking chuck for there range of wood lathes so you can se the jaws ,am not that great with the computor to put up a picture,hope this helps

Is it the one described as Clarke 4 Jaw Chuck for CWL1000b & CWL1000cf if so it is not suitable for holding wood. Why they keep advertising them as such is beyond me unless you want to hold metal in a wood lathe. Many woodturners would not class it as a woodturning chuck. You may be better converting it for a metal working lathe.

Howard Lewis24/01/2021 11:13:52
4448 forum posts
8 photos

Never had a self centering 4 Jaw. Have always used an independent, and clocked. In that way can be sure of how much eccentricity, (acceptable or required ) is present.

Do 4 Jaw SC produce the same sort of eccentricities as 3 jaw SC chucks? I would be surprised if they didn't.

Anyone like to confirm / deny?

Howard

john brown 1724/01/2021 11:27:40
132 forum posts
3 photos

Hi derek yes thats the chuck,so think will take your advice and indeed convert to fit the myford for the odd use .

john

not done it yet24/01/2021 11:31:31
5628 forum posts
20 photos
Posted by Howard Lewis on 24/01/2021 11:13:52:

Never had a self centering 4 Jaw. Have always used an independent, and clocked. In that way can be sure of how much eccentricity, (acceptable or required ) is present.

Do 4 Jaw SC produce the same sort of eccentricities as 3 jaw SC chucks? I would be surprised if they didn't.

Anyone like to confirm / deny?

Howard

Hi Howard,

I have two 4 jaw 160mm TOS chucks - one S/C and one independent.

Good quality chucks so no real issue for the centring of the S/C one. But I don’t particularly like it for anything unless perfectly round or square bar. If ‘out-of-round’ it will only clamp on one pair of jaws properly. So I still retain my 3 jaw chucks.

The only square item I chuck in it is my Stevenson’s collet block.

Brian Wood24/01/2021 12:37:09
2340 forum posts
37 photos
Posted by Howard Lewis on 24/01/2021 11:13:52:

Never had a self centering 4 Jaw. Have always used an independent, and clocked. In that way can be sure of how much eccentricity, (acceptable or required ) is present.

Do 4 Jaw SC produce the same sort of eccentricities as 3 jaw SC chucks? I would be surprised if they didn't.

Anyone like to confirm / deny?

Howard

Hello Howard,

I have a 5 inch 4 jaw self centreing chuck, Pratt made and it is a joy to use. I would class it as the best in my workshop. I found it on the Home and Workshop stand years ago at Harrogate. Second hand I know but hardly used and so badly fitted to it's backplate it must have been a real disappointment.

On a trustworthy section of ground thick walled tube it is good to a TIR of 1 mm at 12 inches from the jaws.

Regards Brian

Howard Lewis24/01/2021 12:48:35
4448 forum posts
8 photos

Thanks Brian

Another bit of useful info.

Being a Pratt, it would be good.

Howard

john brown 1724/01/2021 16:12:15
132 forum posts
3 photos

Well looking at it now , it should be a simple job to fit a myford backplate ,just a section between the chuck an backplate so a good register can be turned can then hold it in place with a 3/4" unf stud with a bit of loctite as the register keeps it true,well thats my thinking.

john

old mart24/01/2021 16:13:14
2691 forum posts
176 photos

I would sell it and put the proceeds towards a chuck more suited to your lathe. ARC have a range and backplates for Myford.

john brown 1724/01/2021 16:23:55
132 forum posts
3 photos

As a rule old mart l would do that ,l do have a small 4 jaw chuck for the myford,but as l was given this one plus l have a couple myford backplates just gathering dust for a bit of turning and being a bit bigger thought it would be handy for the odd job.

john

old mart24/01/2021 16:30:54
2691 forum posts
176 photos

Some of the wood lathe type chucks have changable top jaws which bolt on. If yours is this type, then you could make a set, or sets of custom jaws for it. Having a backplate ready to modify for it does make a difference.

john brown 1724/01/2021 16:44:00
132 forum posts
3 photos

Very good thinking old mart,yes indeed it would be worth while ,plus it also becomes a small face plate,how comes a little turning job always turns in to yet another project ?

john

Nicholas Farr24/01/2021 16:54:19
avatar
2625 forum posts
1225 photos

Hi John Brown 17, I have one of those that I used to use on my fathers RandA lathe and it will hold metal. I bought it from Home & Workshop Machinery at one of the exhibitions many years ago for a fairly cheap price, but I had to bore it out and put a thread to suit the lathe. Quite useful for doing short tube with a large diameter, but wouldn't recommend it for big heavy lumps of any great length. Keep meaning to make an adapter plate so I can fit it to my mini lathe. I have also got a similar one without any jaws and was thinking of making a face plate with that.

Regards Nick.

Edited By Nicholas Farr on 24/01/2021 16:57:17

john brown 1724/01/2021 17:04:27
132 forum posts
3 photos

Thanks Nick good info ,yes would not use it for heavy or long work if l ever did then would use a centre with it but would think twice before l did , so thanks

john

john brown 1730/01/2021 15:10:42
132 forum posts
3 photos

Update on chuck ,fitted it to the myford back pate ,and very pleased should be very handy for light work ,squared off some 75mm x 73mm thick walled box section and was great,another string for the myford use plus its cheaper to run than the big southbend so thanks nick for your idea.

john

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