Thread: that was a bit interesting- compact chuck flew apart

Originally Posted by chuck1

wow that's scary! I never heard of that happening! good to hear it missed you! and well done getting it back together!
I have heard of them unscrewing if the Lathe is stopped to fast!

I,ve had mine unscrew while the lathe is running

Originally Posted by DaveTTC

I,ve had mine unscrew while the lathe is running

Would usually only do that if you had reversed the spin direction.

Originally Posted by tea lady

Would usually only do that if you had reversed the spin direction.

dont have reverse, just left the lathe running while I swapped chisels , I'd do a shrug icon but none on this app and I dont know the short-cut

Hi Dave,
Are you using anything between the Chuck & the Head.
I just keep my Pieces Clean, & have only ever used Steel to Steel
When I want to remove my Chuck, I normally use my Knockout Bar, across the Jaws. So much easier than using my Tommy Bars, as that can Elongate the Chuck Holes in my Chuck anyway, & I can lock the Spindle, to do this.

Originally Posted by issatree

Hi Dave,
Are you using anything between the Chuck & the Head.
I just keep my Pieces Clean, & have only ever used Steel to Steel
When I want to remove my Chuck, I normally use my Knockout Bar, across the Jaws. So much easier than using my Tommy Bars, as that can Elongate the Chuck Holes in my Chuck anyway, & I can lock the Spindle, to do this.

Steel to steel, though it has been suggested I use something like a large tap washer

I use a bar in the jaws too

I've had it come loose on a few occasions

Hi Again,
So what Lathe do you have Dave, & is it Variable.
My Lathe is a " Tough ", Variable now, & 3000 RPM to Zero in 3 Sec.
Never had any of my Chucks come loose though.
At a loss to know what is going on ?.

the issue was on a HAFCO MC 900, now I have a NOVA 3000 (less then a week). Have not had much turning time on it yet, one project only. Noticed an immediate difference

Just screwing the chuck on finger tight can lead to the chuck unscrewing when switching the lathe off.

I seen this happen a couple of times at club events.

This problem is made worse with modern variable speed lathes that have electronic braking.

A large heavy lump of wood wants to keep spinning when the brake is applied.

The safest method of mounting the chuck onto the lathe spindle is to use the tommy bar to bump it up tight onto the spindle.

I use the palm of my hand to do this. It doesn't take much force.

With my Vicmarc key chucks I use the T bar.

For big bowl blanks I use the clamp supplied with my VL300 to make sure nothing takes off for a trip aroung the workshop.

Cheers

Tim

I have the nova 3000 upgraded to vs i put the chuck on with a light touch metal to metal ( keep the regestering faces clean ) then tighten the grub screw I have taped into the chuck insert it dose not loosen and comes of no trouble. If you use a washer the chuck will not run true as that is what the register is for unless you get a proper made washer then there is no point as it is still metal to metal. just my 2 cents for what it's worth. A i wash my chucks in kero it leaves a nice coating on the when dry.

Ian

Originally Posted by DaveTTC

Steel to steel, though it has been suggested I use something like a large tap washer...

I don't like that idea, any sort of a washer can 'pack' the chuck out from where it was supposed to seat square & true, I've heard blokes using a washer complain 'cos there expensive 'XYZ' brand chuck doesn't run true on their lathe.

Originally Posted by Tim the Timber Turner

...
The safest method of mounting the chuck onto the lathe spindle is to use the tommy bar to bump it up tight onto the spindle.

I use the palm of my hand to do this. It doesn't take much force...

I keep a small rubber mallet at the end of my lathe for this & all the cam locks, using your palm to bump it will eventually cause problems with your hand/wrist/arm.

I see we have a "new" Cliff on here now

Originally Posted by Chesand

I see we have a "new" Cliff on here now

I've had that since February, thought I had better update it.

Originally Posted by Cliff Rogers

using your palm to bump it will eventually cause problems with your hand/wrist/arm.

30 plus years and no problems yet Cliff.

Probably only 10 years left.

I might just make it.

I think a better statement would have been:

"using your palm to bump it MAY eventually cause problems with your hand/wrist/arm".
Cheers

Tim

Yeah well, you can lead a horse to water etc.... there are already a couple of members on here who are suffering from that sort of injury, you might be just lucky.