I've trammed the head of my mill for the first time and was wondering how close is close enough for most of you?
I used a .0005" indicator bolted to the end of a 1/2" rod that I bent 90deg and put in an R8 collet. I indicated directly off the table surface. The sweep radius of the indicator was just over 6". I checked along the X axis then along the Y (moving the table to reach) and when the head was tight I swept across every surface of the table I could reach. I ended up with less than 0.0015" of indicator travel all the way around.
Is .0015" in 12" considered "square" enough for most operations up to using a 2-1/2" face mill or 3" fly cutter?