I have an old Craftsman table saw made in the 1940's and I tried to get
the old motor rebuilt. The man said it was too far gone. It is a 1/3
HP motor. I don't know how many RPM it is. The motor has a bracket
and it is connected to a pivot which allows the motor to hang off the
end of the wooden base the saw is bolted to. I feel as if I need to go
to a 1/2 HP motor, but I do not know what kind of motor to select. I
know I need a motor which has a bracket it I mount it back like the old
motor. Another problem is I do not know how many RPM's a table saw
motor should have. Any help would be appreciated as to the proper
motor and the RPM's. Thanks in advance.
Take a look at the diameter of the pulley on the motor and the pulley
on the saw arbor.
Commonly fractional horsepower electric motors are either a 1725 rpm or
a 3450 rpm motors.
The maximum arbor speed in rpm is a function of the blade diameter. The
larger the blade diameter, the faster (in feet/minute) the cutting rim
of the blade is running.
Here's a typical table. You can probably find more.
MAXIMUM R.P.M. TABLE
Dado Set Maximum
If the arbor pulley is 2x the diameter of the motor pulley, the arbor
will turn at 2x the rpm of the motor. Perhaps you can use logic to back
calculate the motor speed?
You say you know that it is a 1/3 HP motor. Is that all the information
you have on the nameplate?
Did you ask the motor rebuilder if he had any idea of the motor rpm? I
would think that someone skilled in the trade could deduce it from the
Good luck finding a replacement.
Thank you for the information. I am waiting on the motor-man rebuilder
to find me a replacement motor. He did say he could take the old motor
apart again and determine the
Yes, I have been thinking of buying another table saw, but I have a
much newer one that I am having the motor rebuilt on. What luck I
have. :-) It should be ready this week. I was hoping to get this old
Craftsman working and was hoping it was only the capacitor that was
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