On Wed, 1 Jul 2020 at 17:12, Gene Heskett <ghesk...@shentel.net> wrote:
> My problem is getting an accurate diameter for the bolt circle. 1) Measure the chuck hole-centres: Measure 1 hole with a digital caliper. Zero the caliper at the full diameter. Measure between the outsides of two holes. The offset zero will subtract two radiuses, so you get the bolt hole centres, ie one side of an equilateral triangle. Multiply by 1.1547 to get the PCD. Re-zero the caliper to true zero before you forget. 2) Centre the backplate under the spindle. Use a dial indicator in the spindle to locate the spindle directly over the centre. 3) Offset by half the diameter calculated above and drill, roate, drill, rotate. Or: coordinates are: +0.50L, -0.289L 0.000, +0.577L -0.50L, -0.289L -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
