Author Topic: Sticking threads/ jammed chucks and face plates  (Read 3430 times)

Offline Redtails5

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Sticking threads/ jammed chucks and face plates
« on: September 14, 2019, 12:04:04 PM »
Hi one of the last times i was on this forumthere was a piece about sticking faceplates/chucks to lathe spindle threads.
If i remember rightly they were a bit of a pig to shift ?
In the end what was the cure to stop it happening again please?

Offline Paul Hannaby

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Re: Sticking threads/ jammed chucks and face plates
« Reply #1 on: September 14, 2019, 01:33:25 PM »
Some sort of washer helps prevent sticking - either paper, leather or plastic

Offline Twisted Trees

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Re: Sticking threads/ jammed chucks and face plates
« Reply #2 on: September 14, 2019, 05:44:17 PM »
Definitely the washer as Paul suggested, I am also a fan of PTFE spray on many of my machine parts e.g. https://www.axminster.co.uk/ambersil-dry-ptfe-film-anti-stick-952137.

It is a dry lubricant so doesn't collect sawdust, I also use machine wax on machine tables, lathe bed etc. e.g. https://www.liberon.co.uk/product/lubricating-wax/
TT, AKA Pete, but that name is taken :-)

Offline burywoodturners

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Re: Sticking threads/ jammed chucks and face plates
« Reply #3 on: September 16, 2019, 07:57:13 PM »
I can only remember one sticking chuck, and that was from switching the lathe on before taking the chuck up the he mating faces. I always just take it up to the mating faces and just  so they touch, you will feel that.
I never leave the chuck, face plate on the lathe when not in use, some people suggest that it is rust creeping in which makes it stick, but I wonder if it is really fine dust absorbing moisture.
I have never usesd a washer and my main lathe was bought new over twenty years ago.
Do not forget that both the spindle threads, the internal thread on you chuck and the MT on your lathe need cleaning now and again, I use a wire brush, bought from the plumbing section of a DIY Shed and is used by plumbers to clean and deburr 15mm copper pipe.
If you do need to uses force to move it, do not use the indexer to lock the shaft, most use recesses in the pulley wheel which is made from aluminum and is too fragile.
Ron

Offline Redtails5

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Re: Sticking threads/ jammed chucks and face plates
« Reply #4 on: September 23, 2019, 03:19:21 PM »
Hi
Many thanks for the replies, i got the face plate without doing any real damage.
Where you have two mating face that are not damaged with good threads cut to within tolerance you may find this is the reason for this to happen.
I bought some 2mm thick leather washers that cured the problem many thanks once again.

Offline Lazurus

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Re: Sticking threads/ jammed chucks and face plates
« Reply #5 on: September 23, 2019, 05:03:09 PM »
Before I got the VB36 (Bayonet fitting) I used washers cut from simple waxed paper - worked a treat
Living and working on the Norfolk Broads

Offline The Bowler Hatted Turner

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Re: Sticking threads/ jammed chucks and face plates
« Reply #6 on: September 26, 2019, 09:22:21 AM »
Hi
Many thanks for the replies, i got the face plate without doing any real damage.
Where you have two mating face that are not damaged with good threads cut to within tolerance you may find this is the reason for this to happen.
I bought some 2mm thick leather washers that cured the problem many thanks once again.
Just be careful usung leather as it can compress more in one place than another possibly causing a distortion of mating surfaces.

Offline hughie

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Re: Sticking threads/ jammed chucks and face plates
« Reply #7 on: October 25, 2019, 12:40:35 PM »
I do it a bit differently, as I never do up the chuck hard or use any sort of washer. I just bring the two faces together so the make merest of a tap and a leave it there. I rarely if ever have any difficulty in undoing chucks or face  plates, OK my lathe wont go in reverse so that isnt going to be an issue for me

Offline Wood spinner

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Re: Sticking threads/ jammed chucks and face plates
« Reply #8 on: October 25, 2019, 05:52:30 PM »
I make you own washers out of milk bottles ( plastic ) using stanley blades
Beauty is in the eye of the beeholder,
careful how you hold the bee as you may get stung !

Offline Mark Hancock

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Re: Sticking threads/ jammed chucks and face plates
« Reply #9 on: October 25, 2019, 06:42:10 PM »
I make you own washers out of milk bottles ( plastic ) using stanley blades
It's easier with double sided tape, spinning on a lathe and cutting with a skew chisel. :)

Offline The Bowler Hatted Turner

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Re: Sticking threads/ jammed chucks and face plates
« Reply #10 on: October 25, 2019, 10:06:07 PM »
I still have a sheet of gasket paper, remember that? I cut my washers out of that.

Offline Wood spinner

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Re: Sticking threads/ jammed chucks and face plates
« Reply #11 on: October 25, 2019, 10:36:57 PM »
I make you own washers out of milk bottles ( plastic ) using stanley blades
It's easier with double sided tape, spinning on a lathe and cutting with a skew chisel. :)

If you have DS tape , currently I don't  ;D
Beauty is in the eye of the beeholder,
careful how you hold the bee as you may get stung !

Offline John Plater

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Re: Sticking threads/ jammed chucks and face plates
« Reply #12 on: October 26, 2019, 09:52:12 AM »
I was given to understand that many of the occasions when faceplate or chuck seem to get locked come after a catch when the two mating surfaces are not mating properly. The force of the catch, the torque from the motor and the momentum of the rotation make the final turn of the thread and lock the two together very powerfully.
ATB John
If I had a better lathe, I would be able to show my ineptitude more effectively.

Offline Duncan A

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Re: Sticking threads/ jammed chucks and face plates
« Reply #13 on: October 26, 2019, 10:17:38 AM »
I use a washer scribed from a margarine tub using a pair of dividers  - no need for scissors.
Very rarely needed but handy on occasion. I do wonder if stainless steel as used on some lathes and chucks is more prone to locking up - certainly, anti-galling paste is advised when screwing SS components tightly together.
Duncan

Offline hughie

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Re: Sticking threads/ jammed chucks and face plates
« Reply #14 on: November 26, 2019, 08:27:29 AM »
I was given to understand that many of the occasions when faceplate or chuck seem to get locked come after a catch when the two mating surfaces are not mating properly. The force of the catch, the torque from the motor and the momentum of the rotation make the final turn of the thread and lock the two together very powerfully.
ATB John

Thats pretty much what happens.