Thread: Mysterious saw marks

Does the mark match the distance to the riving knife, it may not be set properly.

Hi Groggy thanks for your thoughts, that was also one of mine. It has a fixed splitter rather than a rise and fall riving knife, but the marking persists even when I remove the splitter .

Perhaps a pic of the scoring and a bit more info on the saw, what model is it?

Hopefully this should give an idea of what's going on . It seems as though at a particular point there is lateral pressure on the cutting edge of the saw blade but I'm blowed if I know where it's coming from . The saw is a Carbatec model TSC 10HB

At a guess, I'd say the fence and blade, or blade and slots, are slightly out of alignment.

+1 what Groggy said. Have you recently changed the blade ?

It's a brand new saw and a brand new blade and it happens with other blades as well.

My first check would be to ensure the slots are parallel to the blade. You may need to loosen the top and tap it into alignment with a knockometer.

Curious?

The only time I have seen something similar was if the saw was turned off and the blade allowed to run down while the timber was still in contact. Any chance of this?

I would guess that the crosscut sled is a poofteanth out of square to the blade hence it is rubbing to make that mark.

Changing the rate at which you are feeding the timber into the blade may be the cause as well.
Are you slowing down just before you come through the edge. This would cause the blade to deflect slightly less than during the rest of the cut.

Dear Borer,

This one's a bit "left-field", but is it possible that the Spindle is somehow slightly loose in the Trunnion, to the effect that the extra cutting pressure when cross-cutting is pushing the Blade and Spindle backwards slightly, until the pressure is released when the front of the blade breaks through the near-face of the timber. The result of the sudden decrease in cutting-pressure could be that the Belt-tension might then pull the Spindle suddenly back to it's original position, causing the Blade to rotate slightly in plan, to the effect that the rear arc of teeth suddenly bites sideways a little into the timber perhaps (to leave that scored arc in your photo...)? Hmmm... One indicator in this regard would be if the problem seems to decrease on softer timber. The likelihood would probably also depend on exactly where the Motor sits with respect to the Spindle - fore or aft?

But, yeah, that consistent 200mm dimension that you mentioned has got me thinking "cutting-pressure" and "Spindle-movement". Unfortunately, it might be a bit hard to tell, too, because there's probably no way you can get at the Spindle with enough leverage to see if the thing wobbles a bit under force. You'd probably have to take the Belt off as a first step to investigate the possibility in any case.

Best Wishes,
Batpig.

Dear Borer,

It just occurred to me now - when you said "new" Tablesaw, did you actually mean new new, or did you instead mean new 2nd-hand? If the latter, badly worn Spindle Bearings could possibly lead to the same effect as described in my previous post. Could even be the reason why the previous owner sold the unit...

Best Wishes,
Batpig.

I have the same table saw and got a crapp cut,changed to a good quality blade and thing got good--then it started to do strange things like that you have,in the end it seized up.
The problem was that the bearing locks on the spindle shaft came loose,so it could be very much to do with the spindle.
Carba Tec were great in fixing it up picked up the saw(less all atthments)took in back ,fixed all and returned to me ,great service!!