On 2/6/2021 3:37 PM, Jim Wilkins wrote:
"Paul Drahn" wrote in message ...
On 2/2/2021 10:20 AM, Bob La Londe wrote:
My bigger import lathe is not bad. I can dial stuff in by hand to
about 3 tenths. The problem is under power the indicator needle turns
into a blur about 1.5-2 thousandths wide. For 99% of what I do that
is fine, but that other 1% is growing. Is the only answer to install
a 3 phase motor? I'm not completely against it, but its a bit of a
job to move the lathe, swap the motor, and reconfigure the controls.
Not something I can do in an afternoon.


Are sure the problem is the motor and not the gears driving the spindle?
Paul

-----------------------

The motor may be the easiest potential cause to confirm or eliminate.


I'm not 100% sure of anything anymore. I may just not have dialed it in
as close as I thought. Just for the heck of it I turned a piece of
medium hard pin stock and slapped an indicator on it as cut and only got
a couple tenths runout with the motor turning the chuck at 300 RPM.
Now I am thinking I must have shifted the chuck at some point when I was
adjusting the set tru part. Either that or there was a bad spot on the
first dowel I used that was making the indicator jump when running.

Either way I'll have to loosen it up and reset it when I need to do a
job that has to be flipped in the middle.

Anyway, a motor swap is probably not needed at this point.

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