Taking Chinese 3 Jaw Metal Lathe chuck apart for cleaning
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Jim Woodworth
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This is going to require some "fun" in the shop to test. I'm very intrigued. Thanks for enlightening me.
JimDobson
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I made one a few years ago -
The square stock is mounted in the tool holder with the bearing vertical. The square stock is either perpendicular to or inline with the axis of the spindle, depending on which face you want to align.
With your work piece snug in the chuck, you slowly advance the bearing in toward the workpiece. Contact will be made at the "high" spot on the work piece, and the bearing will push the work piece a bit "lower." Eventually the bearing will be making light contact with the entire piece, and the piece is aligned. You can then finish tightening the chuck.
With your work piece snug in the chuck, you slowly advance the bearing in toward the workpiece. Contact will be made at the "high" spot on the work piece, and the bearing will push the work piece a bit "lower." Eventually the bearing will be making light contact with the entire piece, and the piece is aligned. You can then finish tightening the chuck.
Jim Woodworth
Member
Jim Woodworth
Member
Worded very well, added to the visual above I think I'm buying in to the process. Thanks, Jim
Jim Woodworth
Member
Tim1974 notes my one concern, Would spinning the chuck by hand suffice?
I can remember way back in school the instructors being very strict with students about not tightening work in the chucks thoroughly before powering up.
I can remember way back in school the instructors being very strict with students about not tightening work in the chucks thoroughly before powering up.
Jim Woodworth
Member
Thanks Jim Dobson for the original chuck cleaning post,
Because of your post I got brave enough to take down and clean up at least enough to function a 3-jaw that I had never used. it was stuck solid.
Because of your post I got brave enough to take down and clean up at least enough to function a 3-jaw that I had never used. it was stuck solid.
mcostello
Member
Hand speed will work also.
goldstar31
Well-Known Member
Of course. it is a wonderful way to 'bell mouth' a chuck.
A piece of exact diameter metal to the work to be machined and placed inside the chuck would avoid this.
Ah well?
Norm
A piece of exact diameter metal to the work to be machined and placed inside the chuck would avoid this.
Ah well?
Norm
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If you wanted to use oil you could try steam oil - it’s much thicker and more ‘gloopy’ so doesn’t tend to get thrown off things so quickly. Personally, although I’m no where near an expert I use grease in mine as it tends to stay put for the most part.
Nick
harborfreight8x12
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Hello all. In answer to Tim1974, safety is my primary concern and I always wear a full face shield that meets Z87.1+ standard. That said, first I try re-chucking the piece to see if it centers on its own, if not, then I use the 'bump' center but only turning the chuck by hand. At this point, the chuck is only lightly snugged so as not to damage or 'bell mouth' the jaws. Others have said that they use a bar of nylon pressed against the piece, but I love to make gadgets and skateboard bearings are reliable and inexpensive.
Kind regards, Al
Kind regards, Al
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