Quote Originally Posted by EvolveES View Post
My second issue is when i measure the edge of the center precision T-slot i am getting a variation of 0.0115", i have always wondered why the vices we use will not align with the keys in them.
Which is why a lot of shops with professional level equipment don't rely on vise keys to align their vise. Sweeping a vise with a DTI to align within 0.001" should only take you 2 minutes (with some practice). I bought a set of keys (DAMW), but haven't even bothered to install them to see if they work.

Why do you call it "precision t-slot"? It looks like it is milled, not ground, just like any other (non-precision) t-slot I see on other machinery.

wrt to table flatness... I am thinking it is not that the table is not flat (although that might be true), but is that the head or column is out of tram.

I don't agree with all of the approaches John took in the video below, but what he did works... and you can see an amazing change in indicated readings from a pretty simple process:
https://www.youtube.com/watch?v=lle-k_ccFAA