Table saw

[mailee]

Help! Today I have been using my 12" SIP cast iron table saw for about three hours and it cut out! After a short time it started up again and ran for about another 30 mins afterwhich it again cut out? It looks like the thermal overload is kicking in as it runs when I hold in the start button but stops as soon as it is released. After giving it time to 'cool down' it is fine again? Anyone any ideas why? :?

 

[Dibs-h]

Help! Today I have been using my 12" SIP cast iron table saw for about three hours and it cut out! After a short time it started up again and ran for about another 30 mins afterwhich it again cut out? It looks like the thermal overload is kicking in as it runs when I hold in the start button but stops as soon as it is released. After giving it time to 'cool down' it is fine again? Anyone any ideas why? :?

Sounds like a dodgy NVR switch - I've had that sort of thing before.

 

[9fingers]

Two possibilities.

1) The thermal trip in the NVR is playing up

2) The motor is drawing more current than it used to and the thermal trip is sensing this and protecting the motor as it should do.

Try this and report back.

Record the setting on the thermal trip inside the NVR
Note the current rating on the motor plate.

The trip should be set a little higher than the figure on the motor.

As a test (only!) increase the trip current by 10-20% and see if the saw will run longer. If it does then this suggests that the motor is probably OK and the NVR is probably at fault. Return the original current setting after the test as this is not a solution.
No significant change in the running time suggests that the motor has a problem and is drawing significantly more current that it should. In this cae the motor will be hot to the touch - usually hotter than you can bear to keep your hand on it.

Bob

 

[cutting solutions]

what material are you cutting
which saw blade are you using (number of teeth and diameter)
is the blade sharp?

 

[cambournepete]

After a lot of use a couple of weeks ago my Kity cut out and behaved as you described.
I had a feel of the motor - well for a split second as it was 'kin hot!
I was rather glad it had cut out so the saw survived...

Perhaps yours is behaving normally?

 

[Carlow52]

2 suggestions:
is the motor rated for continuous work?
Is the motor clogged with sawdust?

 

[mailee]

Well thanks for all the replies guys. I was only cutting light cuts on some MR MDF so wasn't overloading the motor. Having said that it had been running for about two hours. Er, Bob, I am afraid that is over my head mate. How do I record the setting on the thermal trip or indeed adjust it if need be? I think before I get involved with anything over my head I will give the cabinet and motor a good clean out and see if that helps. I have cut a lot of MDF and the fine dust gets everywhere as you all know so maybe it is this. Will keep you posted as to what happens. I did manage to get the cuts finished with the table saw I am glad to say though.

Oh, by the way, this is what I was doing on it: I know, I know, wheres the crown guard.

So I could build this:

 

[9fingers]

Maybe you had better stick to the clean up idea :lol:

If it still cuts out then see how hot the motor is.

Adjustment is normally by moving a little lever or turning a screw or knob inside the NVR.
As with everything electrical take care and get expert advice in person if in doubt.

Bob

 

[9fingers]

Oh, by the way, this is what I was doing on it: I know, I know, wheres the crown guard.

Crown guard?? Where is the dado head? Just the job for that task!

Running & Ducking

Bob

 

[Digit]

I can't say about the 12 incher Bob but my 10 inch SIP does not have an adjustable TOC in the NVR.
One test not mentioned Mailee is to remove the belt and spin both the motor and the blade by hand to see if they spin freely.
Sawdust is a great friction brake!

Roy.

 

[JoinerySolutions]

Sounds like thermal overload kicking in.

3hrs straight with no break is a lot for a machine that is hobby/light industry use rated. Even some pro machines would throw a fit at 3hrs no tea break, or would that be the operators :lol:
What does your manual say?

Rob.

 

[mailee]

Looks like you are right Rob, I gave the saw a good clean out today and it is running fine. I think I overworked it and stuffed it full of dust, it just spat out it's dummy. Glad I hadn't killed it though Phew!

 

[chrishyde]

I had the same experience with the Jet 10inch table saw.
The motor would cut out and then start up again without warning. It turned out that the motor on my saw was from a batch that were faulty and Jet sent an engineer to replace it and several others that were also. faulty. I have had no problems since.

It is possible that SIP are using the same motor and having the same problem. I would go back to the dealer and let them deal with the problem.