Hi All
My jet contractor tablesaw 1-1/2 hp motor has recently started to basically stall out on extended 3/4 plywood ripping sessions (after about 3 or 4 minutes). The blade is new, I’m not overtaxing the saw – it just dies without tripping the breaker. I have to wait a few moments and hit the “thermal reset button” on the motor itself, then it will let me continue for a short while before cutting out again. Is the motor toast? Or should I open it up and blow it out with compressed air? I thought all these motors were totally enclosed…any advice would be appreciated.
Dave
Replies
How hot is the motor when it trips out? Can you leave you hand on it? If so, it's more than likley a bad overload on the motor. Swap it out for a new one of the same spec. Should be about $5.
Dave Koury
The motor is a little warm - definitely not hot. What is it that I would be swapping out, the thermal sensor I would assume?
Thanks DJK
Thermal safety switches can pack up with fine sawdust, before you replace it, just try taking it off of the motor and blowing it out.
John W.
Just a suggestion. Are you supplying good power to the saw?
Too long of cords or too small?
David,
Actually, I do have an extra cord connecting the saw to a 20 amp breaker...although for the first year I had the saw I wasn't having this problem. I will switch to a heavier shorter cord (this cord I have adds about 10 feet to the run...
Good suggestion - thanks.
Dave
Yep, you should be using 12ga wire for any extension cord you're using. I took the original cord off mine and installed a longer, heavier (12 instead of 14) cord.forestgirl -- you can take the girl out of the forest, but you can't take the forest out of the girl ;-)
A few other "maybe-ifs":
A new saw blade doesn't necessarily mean "sharp." Should be, but not always, nor properly ground.
And is the blade - type - properly suited to what is being cut?
Blade alignment may have gone off (dust in the mounting, etc)... or the new blade wobbles more. Subtle binding between wood and blade may not be obvious unless it is excessive (burn marks). But any (new) extra load well may be enough to cause a problem, heretofore escaped when things were a bit better, i.e., you were living on the "thin edge of survival" and got away with it... but now the slight extra load pushes you over the cliff, the motor dies.
Dave,
Have had this same problem with my Jet contractor saw in the past. As Forestgirl suggests, a longer, heavier extension cord has worked wonders for me. I say that tongue in check, however, as I was about to give up and get a new table saw (I bought mine used) when I was told to shorten and use a heavy guage cord.
Good luck!
RR
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