Skil 3310 Table Saw Usually won't turn on
I bought a Skil 3310 Table Saw several years ago. At the time my table saw was an old pile of junk which didn't even have a fence, and apparently I traded it in for a new pile of junk. While its several years old, I really haven't used it much... maybe 1 hour of total time at most over the course of its life. Other than having saw dust covering it, it basically looks new. A couple weeks ago I went down to my basement to use it and found it wouldn't turn on. I completely forgot about and two days ago, I tried again. And it worked. I thought nothing more of it, but then I went to go use it again, and it wouldn't turn on... and hasn't successfully turned on since... and then I remembered the incident from a couple weeks ago. Prior to that, I never had an issue with the saw.
I pulled the switch out, and confirmed that the switch is a SPDT switch that seems to work perfectly. That is, there is no short between the two inputs. No short between the outputs, and when switched on each input shorts to its respective output, otherwise all four terminals are open.
I measured the resistance across the two outputs of the switch (with the motor connected) and found it to be 1.5-1.7 ohms (bear in mind a dead short reads about .2-.3 ohms on the meter). I tried slowly turning the blade by hand, and found it turned freely, without noise. it generated some AC voltage. When I turned it and watched the resistance the resistance briefly jumped to a few ohms negative, and then went back to 1.5-1.7 ohms within 1-2 seconds.
My conclusion is: switch is good... there appears to be a nearly dead short across the motor.... but its not tripping the breaker (on my breaker box). I was thinking there might be some sort of internal breaker or thermal switch, but I can't find one.
I use table saws infrequently, I like having one, but I don't want a big one, because it would just be wasteful (of both space and money). I realize the 3310 isn't a high-end saw, but I would expect it to last more than it did.