classic car forum header
Classic cars forum & vehicle restoration.
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
How To Register     Posting Photographs     Privacy Policy     F/book facebook.com/oldclassiccar

3 jaw chuck quandary
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Vintage Motoring-Related Toys, Tools & Accessories
Author Message
Kleftiwallah



Joined: 27 Oct 2016
Posts: 221
Location: North Wiltshire

PostPosted: Mon Aug 06, 2018 6:53 pm    Post subject: 3 jaw chuck quandary Reply with quote

Good afternoon everyone, I'm having a problem giving my Myford 3 jaw chuck an overhaul. After dismantling and looking for any identifying marks, cleaning out the old grease and inspecting all parts for wear, everything is fine.

The rebuild. I've sparingly coated all parts with new clean grease and on initial rebuild everything is fine, until I tighten the six screws the last turn.

The chuck startes to tighten up and with the screws fully tight the chuck is hard to operate. The only thing I can think of is the three fluted gears are site specific but I'm kiggered if I can find any marks to line up with the semi circular slots.

Over to you knowledgeable ones. Cheers, Tony. Confused
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
consul 57



Joined: 09 Nov 2017
Posts: 129
Location: somerset

PostPosted: Mon Aug 06, 2018 7:41 pm    Post subject: Reply with quote

the jaws need to go back in the right slots, my chuck has 1,2 & 3 on each jaw
Back to top
View user's profile Send private message
peterwpg



Joined: 10 Apr 2008
Posts: 2223
Location: New Brunswick. Canada

PostPosted: Mon Aug 06, 2018 8:50 pm    Post subject: Reply with quote

I used to have a lathe, with a 4 jaw. All the pieces were stamped and the only way to assemble was the right way.

https://www.youtube.com/watch?v=CP6tW2ge2xs

Re-assemble before fitting the jaws.
_________________
Peter L
Back to top
View user's profile Send private message Send e-mail
ukdave2002



Joined: 23 Nov 2007
Posts: 3330
Location: South Cheshire

PostPosted: Mon Aug 06, 2018 9:19 pm    Post subject: Reply with quote

yep they are usually numbered
Back to top
View user's profile Send private message Visit poster's website
Kleftiwallah



Joined: 27 Oct 2016
Posts: 221
Location: North Wiltshire

PostPosted: Mon Aug 06, 2018 9:27 pm    Post subject: Reply with quote

The problem isn't with the three jaws, the problem is when I close the two segments of the jaws (minus the threaded portion that afixes the chuck to the lathe) with the three fluted jaw adjusters in position.

These two parts are held together by 6 slotted cheese headed screws, when thses screws are finally nipped up the chuck key is difficult to turn (this is before entering the 3 jaws into their respective slots). I thought I made it clear the problem wasn't with these 3 jaws.

Cheers, Tony.
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
peterwpg



Joined: 10 Apr 2008
Posts: 2223
Location: New Brunswick. Canada

PostPosted: Mon Aug 06, 2018 9:51 pm    Post subject: Reply with quote

In the you tube link, at the end there is the reassembly. There is no grease used just a thin coating of oil. A good chuck is very precise and even a few thou layer of grease can affect assembly. Grease doesn't compress.
_________________
Peter L
Back to top
View user's profile Send private message Send e-mail
Kleftiwallah



Joined: 27 Oct 2016
Posts: 221
Location: North Wiltshire

PostPosted: Tue Aug 07, 2018 10:33 am    Post subject: Reply with quote

In the you tube display I watched he was slapping grease on with a paintbrush!

Not really an answer to the initial problem, BUT I've sorted it out. I've interposed a 14 thou shim washer between the two internal bosses on the castings, it seems to have done the trick.

Cheers, Tony.
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
peterwpg



Joined: 10 Apr 2008
Posts: 2223
Location: New Brunswick. Canada

PostPosted: Tue Aug 07, 2018 12:12 pm    Post subject: Reply with quote

Well, now that's sorted we can all move on.
_________________
Peter L
Back to top
View user's profile Send private message Send e-mail
Kleftiwallah



Joined: 27 Oct 2016
Posts: 221
Location: North Wiltshire

PostPosted: Tue Aug 07, 2018 6:25 pm    Post subject: Reply with quote

After we have learned something we can tuck away for future reference in the diminishing stock of 'grey cells'!

. Cheers Tony.
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
Mog



Joined: 30 Dec 2007
Posts: 598
Location: Sydney

PostPosted: Tue Mar 05, 2019 4:18 am    Post subject: Reply with quote

Not a good idea to use grease , it picks up all the steel file lings and makes good grinding paste ! A little light oil only .
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Vintage Motoring-Related Toys, Tools & Accessories All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Forum T&C


php BB powered © php BB Grp.