Quote Originally Posted by BillTodd View Post
Did you use a parallel or similar between the bed and the DTI? It helps to smooth out bed irregularities.
I measured it two ways to compensate for the lumpy bed, but seem to have cocked up :nope:

I reckon my -4 mils East measurement was actually a +4 mils, giving a +-6 mil East West tilt. I mean the tilt has to show even either side, doesn't it? :whistling:

6 mils over a 9cm radius translates to nigh on 0.3mm of packing at the column base, it's around 0.1 degrees out. I could see it was a bit bent when facing with larger endmills but didn't think it was that far out.

New plan. I have some 0.47mm brass sheet, I'll put a strip of that down the West side of the column base then shim the East side until it comes true(ish).

Not much of a plan, but hey, it's a plan. Now where did I put my piercing saw? :naughty: