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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Mon Aug 06, 2018 6:53 pm Post subject: 3 jaw chuck quandary |
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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. _________________ It may work in practice, but not necessarily in theory! |
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consul 57
Joined: 09 Nov 2017 Posts: 491 Location: somerset
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Posted: Mon Aug 06, 2018 7:41 pm Post subject: |
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the jaws need to go back in the right slots, my chuck has 1,2 & 3 on each jaw |
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Mon Aug 06, 2018 8:50 pm Post subject: |
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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. |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4120 Location: South Cheshire
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Posted: Mon Aug 06, 2018 9:19 pm Post subject: |
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yep they are usually numbered |
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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Mon Aug 06, 2018 9:27 pm Post subject: |
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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! |
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Mon Aug 06, 2018 9:51 pm Post subject: |
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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. |
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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Tue Aug 07, 2018 10:33 am Post subject: |
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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! |
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Tue Aug 07, 2018 12:12 pm Post subject: |
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Well, now that's sorted we can all move on. |
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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Tue Aug 07, 2018 6:25 pm Post subject: |
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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! |
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Mog
Joined: 30 Dec 2007 Posts: 661 Location: Sydney
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Posted: Tue Mar 05, 2019 4:18 am Post subject: |
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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 . |
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