Re: Lowering Lathe Speeds With A Rheostadt. OK idea? Bad idea?
KIMOSABE wrote:
I had an earlier thread asking about a Jet wood lathe, and one of the
things that people get concerned about is that some lathes do not have
a slow speed that is as slow as they would like it. Turners doing
outboard stuff seem to prefer to be able to get down to speeds in the
300's.
The lathe I'm looking at has a bottom speed of about 550.
Question: If I put a variable resistor in line with the motor to cut
the voltage when I need a low speed, would that do the trick or would
that be bad for the motor?
A rheostat will work with a universal (AC/DC) type motor but will burn
out an induction motor. Jet lathes have induction motors.
--
Jack Novak
Buffalo, NY - USA
novasys@xxxxxxxxxxx
.
Relevant Pages
- Re: Turning speeds re-visited
... Many of the home shop lathes are compromises as Don stated. ... are better performed at 50-100 RPM. ... The supplied motor with the 9x20 model is a fixed speed AC induction motor ... requiring additional belt changes for low speeds and original/normal speeds. ...
(rec.crafts.metalworking) - Re: Turning speeds re-visited
... There are very few ideal machines in the price range of the generic Chinese home shop lathes. ... Many 9x20 users were more concerned with bringing the minimum ~120 RPM to a lower speed, for threading under power and cutoff/parting operations, which are better performed at 50-100 RPM. ... The supplied motor with the 9x20 model is a fixed speed AC induction motor with a stated 3/4 HP, but actually might be closer to 1/2 HP. ... If a user wanted to add a couple of pulleys on a jackshaft for speed reduction, it would require more mounting space behind the machine, and add the inconvenience of requiring additional belt changes for low speeds and original/normal speeds. ...
(rec.crafts.metalworking) - Re: Turning speeds re-visited
... Digital SFM readout at a glance, and RPM too ... Many of the home shop lathes are compromises as Don stated. ... requiring additional belt changes for low speeds and original/normal speeds. ...
(rec.crafts.metalworking) - Re: looking for Recommendations on a lathe
... You need the slower speeds on the "larger diameter capacity" ... With these lathes you need to go slow because the outer perimeter ... turning and the like do not need slow speeds on small lathes. ...
(rec.woodworking) - Re: Turning speeds re-visited
... so) that have spindles which go down to only about 120-160 rpm. ... To get spindle speeds in the double figures one has to go a size (and ... I think the small lathes have low speed capability because they use variable ...
(rec.crafts.metalworking) |
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