"RacinBob" (racinbob)
08/31/2020 at 01:05 • Filed to: None
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"RacinBob" (racinbob)
08/31/2020 at 01:05 • Filed to: None | 0
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My bro in law inherited this wood lathe. The problem is the prior owner mounted the chuck in a way that was unintended and is not true. Somehow he fastened it into the ID of the shaft. It wobbles and he wants to move a new chuck to the OD. It doesn’t want to come apart. How would you pull it?
Chinny Raccoon
> RacinBob
08/31/2020 at 01:33 |
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That’s creative. Looks like they used a threaded MT adapter to adapt to a different thread pitch and forgot to put the thread protect back on. Is there a hole for a knockout bar on the other end of the shaft?
415s30 W123TSXWaggoIIIIIIo ( •_•))°)
> RacinBob
08/31/2020 at 01:34 |
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RacinBob
> Chinny Raccoon
08/31/2020 at 01:40 |
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Hate to ask, what is a a Knockout Bar. I searched it and came up with this....
Merkin Muffley
> RacinBob
08/31/2020 at 01:43 |
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The odds of that ever being true to run-out tolerances?
Uh zilch.
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RacinBob
> Merkin Muffley
08/31/2020 at 01:51 |
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Gotcha, the question is how do you get the present chuck out of the shaft.....
Longtime Lurker
> RacinBob
08/31/2020 at 02:06 |
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Cut the Chuck off with a reciprocating saw, then use a bolt or screw extractor to remove the remainder.
Distraxi's idea of perfection is a Jagroen
> RacinBob
08/31/2020 at 03:24 |
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Pretty sure that if you had that lot o n the other end of your shaft you’d be wobbling too.
barnie
> RacinBob
08/31/2020 at 05:43 |
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Spray the chuck shaft at both ends with PB BLaster or similiar. Go have a cuppa.
1. Then apply a pry bare to the back of the chuck and gently tap on the chuck. Spin the chuck a bit and repeat pry/tap. Don’t use enough pressure to maul the shaft threads.
2. Might also be able to clamp the tail stock to the chuck and draw it out. Crank the tails tock out a bit, put some roll stock in it’s chuck and clamp it in this chuck. Wh en both tight, crank the tail stock chuck back in (rightward in those pics). Tapping the back of this chuck as you crank may help.
Maybe apply a bit of heat to the exposed threads .
Just Jeepin'
> Longtime Lurker
08/31/2020 at 07:10 |
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Cut the Chuck off with a reciprocating saw
What’d Chuck ever do to you?
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Merkin Muffley
> RacinBob
08/31/2020 at 07:26 |
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Understood.
Just trying to fathom what they thought they were doing to assemble it like that.
dumpsterfire!
> RacinBob
08/31/2020 at 08:41 |
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i think my first approach would be PBblaster the day before and then light heat to expand the threaded part, spinning by hand, then 2 pry bars. follow that by a large steel BFH.
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RacinBob
> RacinBob
08/31/2020 at 09:31 |
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Thanks for all the thoughts.
1. I suppose step one is to see if the shaft is true. Because if it isn’t, changing the chuck won’t help.
2. Is it a fair assumption t hat the ID is threaded? If yes, is it fair to assume that the direction of loosening is same as the direction of rotation ?
I a m thinking that he should borrow an impact wrench, chuck a bolt into the end of it and see if it loosens it up.
Here is a different view.
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RacinBob
> Chinny Raccoon
08/31/2020 at 13:42 |
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Or is the shaft hollow and they use an interference taper like this and all he has to do is hit it with a plastic hammer?
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RacinBob
> Chinny Raccoon
08/31/2020 at 14:06 |
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I think I have it. The chuck has a taper into the ID of the shaft like with the Harbor freight . What the thread is for is to put a nut on so that you can back the nut out and pop the chuck/taper out of the shaft. See description below.
If that is the design, I have a hard time believing that the chuck is not true and wonder if the shaft is bent.
https://sherline.com/wp-content/uploads/2016/04/tip_014.pdf