Author Topic: Sticking threads/ jammed chucks and face plates  (Read 301 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/

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.