There's a couple of pictures listed under radial arm saws at
http://www.owwm.com/MfgIndex/Detail.asp?ID=650. Is this what yours looks
like? Definitely a different setup.
The fact that the motor spun up OK is a good sign - no need to worry about
the motor windings.
Most motors are sealed, which means you can't lubricate it. If you grab the
blade (with the power off, of course) and give it a spin, it'll probably do
one of three things. If it spins smoothly but slows to a halt quickly,
then your bearings are fine and there's probably not a lot you can do about
the noise. If it spins smoothly and takes a while to slow to a halt, then
your bearings have lost most of their grease, and are on their way out (but
still OK to use). If it doesn't spin smoothly and/or makes an awful
grinding noise, it's time to replace the bearings.
You can probably get the bearings replaced for $100 or so at an electric
motor shop, but I don't know your motor. Before you do that, make sure
there's no "fatal" problems with the entire radial arm saw, e.g. a bent
arm, slop in the bearings the arm rolls on, etc.... This could include
wear in non-adjustable parts or worn out parts that you can no longer
obtain.
You also might want to give Porter Cable a call. Most of these tool
companies are more than happy to help you out, and they may still have a
manual or two lying around, and possibly help with spare parts.
Good luck!
--
Michael White "To protect people from the effects of folly is to
fill the world with fools." -Herbert Spencer
Better performance - the motor can produce more force because of the shorter
distance (torque = force x distance, with torque being constant). Sort of
like putting a bicycle into a lower gear. That's one of the nice things
about a radial arm saw - you can put on a smaller blade to get a little
more applied force. I have a 14" radial arm saw, but use a 10" dado and
12" blades for ripping and plywood. I only have one 14" blade.
If you buy a new blade for it, look for a blade that's meant for a radial
arm saw. These blades have a lower hook angle than most of the blades you
find. Typically it'll say it's for a radial arm saw (along with other saw
types).
bob g.
bob g.