I just overhauled a nice 12" Rockwell Delta Radial Arm saw (Model
L-40C or revised model 33-527).I had to repair a broken casting but
the weld is holding nicely.
What ISN'T so nice is the motor is running backward! The motor is a
Rockwell model 438-02-314-0017 dual voltage single phase 2 HP motor. I
have it set up for 230V (rather than 115V). The input wiring seems
straight forward: 3 wires (2 hot; 1 neutral). There is a wiring
diagram on the motor's coverplate but it says nothing about reversing
the rotation - just how to change the voltage.
How do I get this motor to rotate the other way?
Just for to make sure, if you're facing the saw arbor the rotation is
If so, you there should be a start winding lead on the start switch and
the other end on one of the caps, reversing their positions will reverse
the motor. The polarity of the start winding has to be reversed to gain
the other rotation.
The problem is that motors come in thousands of connection choices and
configurations and not all are reversible and there's no consistent
numbering/labeling of terminals. :(
My suggestion would be to try Delta directly--if you're _really_ lucky
there may be a better diagram online, if not perhaps you can get some
technical support guru.
Just as examples, here are a couple sample connection diagrams that
probably won't help but give an idea of the disparities... :(
Sorry can't be more help...
And, if this is the motor that came w/ the saw, it would seem highly
unlikely it would have been supplied as "changeable rotation direction
enabled" since one would never want the blade spinning the other
direction--which makes one highly suspect that it was swapped or somehow
reassembled/wired incorrectly or...???
_IF_ (the proverbial "big if" :) ) it really is running backwards (CCW
instead of CW) and otherwise seems ok and you can't decipher where the
connections outlined earlier are fubar'ed, you could try taking it to a
local motor shop and see if they can decipher it and/or cobble it to run
in correct rotation.
I'm sure the motor is indeed running backwards. But just in case, the blade
should be turning clockwise as you are looking at the arbor nut side of the
blade. Some have been known to mount the blade backwards.
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