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Bosch tablesaw running backwards?!?

Jesse's picture

I am building a stair handrail for some friends. I have all my tools set up in their living room, and the other day, while I was gone, they were ripping a piece of plywood on my tablesaw and said it started binding and he quickly shut off the saw.

Well, when you turn it on, it now spins backwards very very slowly (I only turned it on for a split second).

What's the diagnosis? We are in small town Montana and there are no tool repair places nearby. I am guessing fried motor = new saw? It's the portable 10" I loved that thing.

(post #123908, reply #1 of 14)

don't know exactly what type of motor you have, but, ....the start winding is damaged,

the motor will now run in either direction ......;.just don't try it with the blade on......if you spin the shaft by hand and the power is on

Edited 12/30/2005 2:23 pm by maddog3

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(post #123908, reply #4 of 14)

I had a motor like that on a jointer many years ago.  Run windings OK, start fried.  Having no money at the time, I came up with a sash cord pull start using the other shaft of the motor.  Pull to get it spinning and the cord free, then hit the switch.  Kinda like starting a gas engine.



-- J.S.




-- J.S.


(post #123908, reply #5 of 14)

oh man the memories...LOL

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(post #123908, reply #7 of 14)

had a table saw like that too at least on a long extension cord

it wouldnt start on a long cord or would run backwards

i would spin the blade the right direction by hand and hit the switch!!!!!

oh god some of the stupid things we used to do

(post #123908, reply #8 of 14)

Better done with the same hand.... 



-- J.S.




-- J.S.


(post #123908, reply #2 of 14)

I'm optimistically thinking that if it's a 220 volt saw that you popped one of the phases - hopefully you can reset the 220 breaker at the panel and all will be working. It would be unusual, but I've seen it happen where that tandem didn't quite kill both phases.

If it's a 110 saw, then I'm not sure...

Let us know what else you find.

(post #123908, reply #3 of 14)

I agree with maddog. Your start windings are toast. If it has a capacitor start (a big lump stuck to the side of the motor) it might be bad.



(post #123908, reply #6 of 14)

Never hurts to ask.. Did the blade nut come loose?


--> measure once / scribble several lines / spend some time figuring out wich scribble / cut the wrong line / get mad


--> measure once / scribble several lines / spend some time figuring out wich scribble / cut the wrong line / get mad

bosch table saw running backwards (post #123908, reply #9 of 14)

I had the same thing happen to mine. i replaced the soft start switch and the field windings for less than 100 bucks onling. it runs perfectly now.

I jes' gotta know how you (post #123908, reply #10 of 14)

I jes' gotta know how you replaced the field winding onling! 

Bought copper wire online? 

Is the $100 a typo, should be < ten dollars for switch and wire

I have been a professional (post #123908, reply #11 of 14)

I have been a professional carpenter and GC for over 20 years, and the same thing happened to me when trying to rip a green 2 x 12.  The saw stopped and then only ran backwards slowly.  I call the rep at Bosch and he literally laughed at me, and told me the saw motor was fried.

I took it to my local repair shop and it wouldhave cost more to fix it than just buy a new one.  So, I bough a Makita 2703 that I still use to this day.  It is a much better saw.

Keep in mind that many motors (post #123908, reply #12 of 14)

Keep in mind that many motors of this class have a start switch -- a centrifugal swith attached on one end of the shaft.  The malfunction may be there, or in the start capacitor, or in the start winding.  (I would think the winding would be the least likely part to fail.)

Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

 Great saw a small garage (post #123908, reply #13 of 14)

 Great saw a small garage workshop. Take the time to get the angles calibrated at the beginning. I work on small projects, furniture, and decorative boxes. The stand will take a little time to put together. It took me about an hour and a half to get everything put together and calibrated like I wanted. This saw has been well worth the money. I love the stand for quick takedown and storage. Pull a lever and park it in the corner out of the way.

Easy fix (post #123908, reply #14 of 14)

Put the blade on backwards and turn the saw around.