Following on from the mounting vice thread.
Assume two objects with flat surfaces which need to be positioned against each other in both xy directions, to a high degree of accuracy, say a couple microns, a tenth of a thou, or so.
In order to improve positioning you have to know how close they are to the desired alignment, and some method like clocking a vice on a mill table can be used for that.
It would be convenient to be able to reposition the vice without reclocking and readjusting - David mentioned a key made as a close fit to your table slots, though I don't know whether that would be accurate enough?
Would the use of pins be any good?
Which is better, hardened, or spring? Why?
I expect people know this, but I don't ...
OK, now I have a bearing holder for the main bearing for a lathe which is supposed to be fairly/very accurate. It is mounted on a flat surface at right angles to the axis of rotation, the front face of the lathe if you like.
I need to align it to within a micron or less. I may need to move it 3 microns down and 2 microns left. It then gets bolted down. The first problem is, how to move it than little, under control?
Second problem, when bolting down it moves.
-- Peter Fairbrother