Ok all so I got a Dewalt SCMS 12 inch and having seen someones zero clearance insert i decided to put one in my own saw.
As always while doing this kind of work I thought I would check out the accuracy of the saw and see if it needed adjustment since I had never done that since time of purchase.
So now I have the insert and checking the angles with a digital protractor I come to the question of how accurate is realistically achievable on these machines.
Anyone want to chime in here about what would be a realistic tolerance to settle for.
I now realize why some guys have the Incra type mitre gauge for the TS.