On May 25, 5:02*pm, Spehro Pefhany
wrote:
Sorry for the metal content, but there might be someone here who knows
the answer!

I would like to find the center of a 6" metal disk (center the mill
spindle precisely over it).

Here is my plan...

Use an edge finder and find 3 points at roughly 45 degrees to the
center by moving only the X axis, then only the Y axis (forming
a right triangle) with the hypoteneuse over the disk. Go halfway on
both X and Y between those pairs of X and Y numbers.

Does this sound like a reasonable plan?

Another option might be to pinch a straightedge between a blank in the
spindle and the edge of the disk. Adjust until the straight edge is
perpendicular to the x-axis. Then move to the center of the disk on
the x-axis (allowing for the diameter of the blank). (Similar to the
trick of setting a tool bit when turning a round on a lathe.)