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Bolt on chucks

Bolt on chucks

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3404612/03/2019 11:32:27
374 forum posts
2 photos

My new Sieg has a bolt on chuck.

Would like to know if there are advantages over a screwed on chuck please ?



JasonB12/03/2019 11:40:06
15175 forum posts
1548 photos

Biggest advantage is you can run the machine in reverse without worry or modification and less likely to get stuck. Downside is they can take a little longer to change particularly if you have chubby fingers.

If yours has nuts and washers on the back of the flange then some users change to flanged nuts so there are less bits to drop in a tray full of swarf.

Hopper12/03/2019 11:53:18
3527 forum posts
68 photos

I think the bolt-on is a good thing. Screw on chucks on Myfrods etc can be a pain in the derriere. Both for jamming in situ and causing unsuspecting operators to shear off back gear teeth by locking the spindle to remove chuck, and for coming unscrewed if used in reverse rotation for screwcutting from a shoulder or parting off etc.

The ultimate of course is cam-lock which is like bolt-on without the fiddle in behind the flange with tiny nuts. But you're not going to get it on a hobby lathe.

3404612/03/2019 11:57:17
374 forum posts
2 photos

Thanks replies gents - all clear now.

Just checked and mine is nuts only, no washers.

Paul Lousick12/03/2019 11:58:25
1045 forum posts
473 photos

I have a screw-on type chuck which is quick to change but wish it was bolted (prefer camlock) so I could run in reverse.


not done it yet12/03/2019 12:17:58
2814 forum posts
11 photos

No advantage at all apart from being able to run in reverse (as long as the drive is not braked in the case of a screwed chuck) while working -, as far as I have noticed. There are better alternatives but both these methods are reasonably suited to hobby engineering.

I prefer the screwed-on chucks for speed and ease of change-over.

SillyOldDuffer12/03/2019 12:44:41
4130 forum posts
832 photos

Fixing a lathe with a stuck screw-on chuck can cause serious damage trying to get it off! Missing teeth on Myford gear-wheels for example, or worse. Several posts on the forum.

I rate bolt-on chucks above screw-ons but below fancy attachments like camlocks.

Helps to have small fingers...


Bazyle12/03/2019 13:03:56
4488 forum posts
184 photos
Posted by Bill Chugg on 12/03/2019 11:57:17:

Thanks replies gents - all clear now.

Just checked and mine is nuts only, no washers.

That is because the previous owner dropped them. Use tank washers as replacements so there is more to get hold of when refitting.

Neil Wyatt12/03/2019 13:04:59
15829 forum posts
672 photos
73 articles

Bolt on chucks are perhaps less likely to be fitted out of true due to bits of swarf as the registers are easier to clean. You don't hear reports of bolt on chucks getting seized in place either.

Plus bolt on fittings scale up to larger sizes better as well.

In good condition neither option offers fundamentally better accuracy.


Howard Lewis12/03/2019 20:52:49
1878 forum posts
2 photos

If you are worried about dropping the smallish ( M6) nuts behind the chuck on mini lathes, Danny M2Z came up with a simple and easy to make a means of holding the nuts whilst a spanner is used to rotate them. Highly recommended.

A scaled up version would be equally useful for larger sizes.

One lathe has a screw on chuck, with dogs, to allow reverse running. I do not use back gear to slacken the chuck. Each chuck has a 8mm hole drilled in it. A long bar with a 8mm round silver steel fixed to the end is inserted in the hole before being given a smart blow with a copper/;hide mallet. (Belts tight, to maximise the inertia ) Works a treat!

The mini has a bolt on chuck.


David Standing 112/03/2019 21:01:26
1201 forum posts
45 photos

I have a screw on (Myford Speed 10), a bolt on (Myford 254S), and a camlock (Boxford 330).

Camlock wins every time, but to me bolt on is much preferable to screw on.

Phil Francis 112/03/2019 21:30:47
20 forum posts
2 photos

Bazyle, as the previous owner I can assure you that they were not dropped as there were never any on there.


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