Originally Posted by MachineTom
...but it will be far better than a fax stuck to a disk and marked out in blue...
I think I see what you mean if one is going for direct indexing - but the rotary table I am working with is geared at 120:1! So even a 5 deg error on the plate, which would be really, really sloppy work, results in a table error of <.05 deg.
The downside is that I will be counting high numbers of turns, and I'm likely to drop one now and again. The table has protractor marks around the rim which will help as a check, and maybe I should rig up a cam and 'clicker' counter - I have some somewhere I was saving for an electrical coil-winding setup.