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Reply by docholladay

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Posted on Question on cutting miters with a table saw

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docholladay

1287 posts in 1813 days


#1 posted 05-03-2012 07:27 PM

First of all, when you say that it cuts again on the back of the blade, is it really cutting or just are the carbide teeth just kissing the wood a little bit as you pass the rear of the blade? If the latter, I woudn’t worry too much about it. If it is really cutting (removing wood), then you have a problem. The blade has got to be out of parallel with the miter slot. I’m not sure what you mean by the dial indicator reads .002” from the miter slot. The actual reading is not important, but you should be measuring at the front of the blade and at the rear of the blade (preferably rotating the same exact tooth front to back and measuring on the same tooth). I assume that you mean that there is .002” difference from front to rear. That isn’t much, but ideally those measurements should be exactly the same or as close as you can possibly manage. In my opinion, this is an area where zero tolerance is acceptable. Another question is, does the blade tend to lift the workpiece up when you pass the back of the blade on a cut. If so, that is yet another indicator that something is out of kilter. If it were me, I would double check the blade being parallel to the miter slots. Check it against both slots just for grins. Check to be sure both slots are parallel to one another as well. Choose a miter slot that you will use primarily (for me it is the one to the left of the blade) and then adjust it to as close to exactly parallel as you can. Then try it. Finally, check the blade for runout. It is entirely possible that it could have some warpage. If there is any doubt at all, change the blade. Also, remove the blade and clean the surface where the blade mounts and clean the threads. Any dust can create some runout of the blade. Last of all, if you do make any adjustments that affect the alignment of the blade, be sure to re-adjust your fence before doing any ripping. Even if the fence was in alignment, it will need to be re-adjusted. The only fixed item is the miter slot. Unfortunately, you can’t change that.

Doc

Doc

-- Hey, woodworking ain't brain surgery. Just do something and keep trying till you get it. Doc


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