I am having a problem with my table saw that is about to make me lose my mind (up in here, up in here). I am about to finish my first year of woodworking. I have a 90s model craftsman table saw that I have had for about 9 months. It is the 315.228390, essentially the same thing as thishttps://www.purplewave.com/auction/121017/item/E2208. I can't decide if this problem has existed since I purchased the saw and I have just gotten to the point where I notice something small like this, or if it is a new problem.
I cannot cut a 90 degree cut. The cuts look angled or rounded, like there is a slight swoop to them, with more material removed from the bottom. If I rip a small piece of wood, something like 3x10 and then stand the piece on the side that was ripped you can see that the piece is leaning a couple degrees. Putting a known square triangle square up to the piece, while standing on edge, makes it very apparent.
It happens on both rips and miters. It happens with plywood and softwood, haven't tried hardwood yet.
Here is what I have checked so far (not necessarily in order):
1) Checked blade for square with table with a known good square
2) Checked blade for square with magnetic digital angle checker (Wixley)
3) Ensured insert is level with table
4) Checked table surface for flat with a quality straight edge and a feeler gauge. Had a couple of spots between .01-.03 out of flat. Basically flat except for scratches in the surface.
5) Tried a different blade<br>6) Attached the magnetic digital angle checker (Wixley) to the blade and moved the blade all the way up and down. Digital angle checker said 89.8-90.2 throughout even while in motion.
7) Checked arbor for wobble by using dial indicator, less than .01 off
8) Took the insert out and ripped a piece of 10x20 scrap plywood, was still off
What else should I be checking? What am I missing? Is there some other part of setup I have forgotten?