How perfect I don't know, but according to my tape, folding rule and square, it's so close I can't tell. I checked mine against my SSC panel saw and saw that the panel saw was almost 1/32 out of square in 24'. Then of course, slid the scale to dead center zero and was set. I then bolted the Excalibur legs to angle iron and bolted that to the TS. Mine only required a very fine adjustment. I clamped the board to the slider's fence where the brad just grazed the front of the blade, then slid the fence back and checked it with the rear of the blade. Then put a brad nail into a 1 X 2 X 3' board. This worked for me: I set my Biesemeyer fence over the blade and used a large layout square against the fence and the slider fence to get it *real* close. Also, the scale only shows 90 degrees with the fence in the front of the slider. I currently am using a straight edge against my miter to true the fence. Through trial and error I am able to set up, but am looking for easier ways. I've never used a slider before and want a little more instruction than what came with the unit.
I recently bought an Excalibur slider which is supposed to make cross-cutting much easier.
