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Any idea why this lathe is chattering? Spindle bearings?

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SteveT:
Sounds like you are getting close to the problem  :D but I note your comment that the back support bearing is tight on the spindle, in my last post I mentioned cross location i.e the spindle and bearing have no room to expand so preventing free expansion of the bearing arrangement. The back bearing should be a light transition fit on the shaft or the housing, if that back bearing is locked in position you can have a multitude of problems including short bearing life.

 

philf:

--- Quote from: SteveT on January 03, 2016, 11:28:22 AM ---e... in my last post I mentioned cross location i.e the spindle and bearing have no room to expand so preventing free expansion of the bearing arrangement. The back bearing should be a light transition fit on the shaft or the housing...

--- End quote ---

Steve,

The normal arrangement of two taper rollers is fail-safe in that, as the spindle expands with the heat, the inner races move apart thus increasing clearance.

I agree the rear bearing shouldn't be a tight fit on the spindle.

Phil.

Fergus OMore:
Apologies but I may be quoting the  obvious but a screwed to spindle chuck does not depend on the thread but to the register- or the backplate if there is no register.


Cheers


Norman

seadog:
I was in the middle of posting a reply, but beaten to it by Norman. The regsiter on the spindle must be identical to the opening in the backplate. The thread is just to hold it onto the spindle.

loply:
Thanks for all the input guys, few more things to check.

I don't suppose somebody with a similar sized lathe could chuck up a 6 inch bar, put an indicator on the chuck body and see how much the chuck deflects by when pressing by hand on the end of the bar?

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