I have an old Powermatic 65 tablesaw. The trunnion has been so sweet, it would raise and lower like a feather. Suddenly now it has slop in the raising mechanism. I first noticed it when the blade jumped on start. I have torn it down as far as I can. I can see that the worm gear just has slop against the rack gear. The only adjustment I can see is on the incoming shaft with that holds the worm and goes out to the handle. I tightened up the thrust collar that pulls the worm and shaft against the trunnion, pulling the worm back as far as possible towards the front of the saw. It feels too tight npw and is hard to raise and lower, but I still have slop in the gear mating and can get about an 1/8" up\down play and see the teeth are sloppy.
It seems crazy that it could sudddenly wear out and across the entire run of tge worm and rack gear. It seems the gears need to be held tighter together but there is no adjustment to change that alignment.
Any ideas would be nice. I really want a Sawstop but don't have the cash right now, just dumped $2k in wood speculating on a new product line, now I can't start cutting. Damn Murphy ;-(