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Posted by Dan on April 5, 2008, 10:26 pm
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I found loose spinde bearings caused my lathe to chatter real bad
while parting. I tightened up the bearings and the chatter went away.
Something to look at.
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Posted by T.Alan Kraus on April 6, 2008, 1:35 pm
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Dan wrote:
> I found loose spinde bearings caused my lathe to chatter real bad
> while parting. I tightened up the bearings and the chatter went away.
> Something to look at.
I have to agree, I have had the same experience.
cheers
T.Alan
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Posted by Joseph Gwinn on April 6, 2008, 2:48 pm
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> I found loose spinde bearings caused my lathe to chatter real bad
> while parting. I tightened up the bearings and the chatter went away.
> Something to look at.
I did think of this possibility, based on other postings, so I went
through the checkout procedure in the Clausing manual.
Basically, with a 9" drive plate (well, mine is 6") in place and the
leadscrew not connected, let the lathe run for an hour to warm up, then
stop the lathe, pull the pin so the spindle is disconnected from the
drive, and give the spindle a spin by hand. It should spin to a stop in
about one turn.
It spun down in about one turn when I followed the procedure, and made
no odd noises, so loose spindle bearings do not appear to be a problem.
Joe Gwinn
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Posted by DoN. Nichols on April 7, 2008, 12:28 am
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>> I found loose spinde bearings caused my lathe to chatter real bad
>> while parting. I tightened up the bearings and the chatter went away.
>> Something to look at.
>
> I did think of this possibility, based on other postings, so I went
> through the checkout procedure in the Clausing manual.
>
> Basically, with a 9" drive plate (well, mine is 6") in place and the
> leadscrew not connected, let the lathe run for an hour to warm up, then
> stop the lathe, pull the pin so the spindle is disconnected from the
> drive, and give the spindle a spin by hand. It should spin to a stop in
> about one turn.
>
> It spun down in about one turn when I followed the procedure, and made
> no odd noises, so loose spindle bearings do not appear to be a problem.
Hmm ... with a 6" plate instead of 9" you have less flywheel
effect, so I would make the test time about 1/2 turn.
Enjoy,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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Posted by Joseph Gwinn on April 7, 2008, 9:58 pm
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> >
> >> I found loose spinde bearings caused my lathe to chatter real bad
> >> while parting. I tightened up the bearings and the chatter went away.
> >> Something to look at.
> >
> > I did think of this possibility, based on other postings, so I went
> > through the checkout procedure in the Clausing manual.
> >
> > Basically, with a 9" drive plate (well, mine is 6") in place and the
> > leadscrew not connected, let the lathe run for an hour to warm up, then
> > stop the lathe, pull the pin so the spindle is disconnected from the
> > drive, and give the spindle a spin by hand. It should spin to a stop in
> > about one turn.
> >
> > It spun down in about one turn when I followed the procedure, and made
> > no odd noises, so loose spindle bearings do not appear to be a problem.
>
> Hmm ... with a 6" plate instead of 9" you have less flywheel
> effect, so I would make the test time about 1/2 turn.
Hmm. Rotational momentum will vary with the moment of rotational
inertia, which will vary as the square of diameter: (6/9)^2= 0.444,
call it one half.
Joe Gwinn
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> while parting. I tightened up the bearings and the chatter went away.
> Something to look at.