I've had this table saw for at least 20 years. Lately, it's
been tripping the breaker with greater frequency. I'm
wondering if the motor is wearing out, or if I should
check something else.
If the compressor is tripping it too you might have a bad breaker. Do you
have another tool that can simulate the same load as the saw but stay just
within the breaker's limits? Breakers are much cheaper than motors.
OTOH, the motor in my old Craftsman started shooting craps at around 20
years. I had to replace the starting capacitor and internal switch and got
another 5-6 years before it died. It never threw breakers unless I just
bogged it down (easy with the 1hp motor).
Eliminate the breaker before you start looking for motors.
Very likely the bearings are going and the motor is having to work harder
trying to get up to speed. They can be replaced. Also possible that he
bandsaw wheel bearings are causing the problem. Remove the blade and the
wheels should spin freely.
Please don't use that joke, there are far too many people who would not
notice the happy face.
Don't replace a breaker with a larger one unless you have verified that
the entire circuit will be able to handler the current and still meet code.
Open the motor case, and clean out the sawdust.
These motors have a centrifugal starter switch at one end.
The contacts pack with sawdust, and can't close.
Causes high-current draw during the start cycle.
( it was a regular maintenance job with my radial-arm saw )
I have an old Craftsman table saw of about the same age (1968). Mine
started to give me trouble several years ago. I took it to a small motor
repair store. They cleaned the ancient sawdust from inside of the motor
and oiled it. It has worked fine ever since.
The reason I am posting is that on my motor there were no obvious places
to oil it. The unit can be oiled at both end of the shaft. There is a
small rubber plug that has to be removed. Added about 10 drops of oil
once per year and replace the plug.
Breakers loose a little strength every time that they trip. Hence, over
time, they will trip at a much lower current level.
Testing the motor is not a simple matter. I suggest you take it to a motor
repair place where they have tools adequate for the testing.
Is it a 15A or 20 A circuit? What does the amperage draw on the motor
label read? What else is on this circuit? Add it all up. It could be you
just have an overloaded circuit. Have you added something new recently?
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