Today machined 6.25" focuser parts on a 45* angle fixture mounted on mill. The center of a tooling ball is used to locate the datum for X,Y,Z axis using centering tool and height tool #1. After the center of the tooling ball is measured the X,Y,Z axis datums are calculated from the tooling ball center. Note that the part has three 0.376" precision holes. On this fixture only two of the 0.376" holes are used to located the part and one round locating pin and one diamond shaped pin is used in a quasi-kinematic way to locate each of the six sides for machining. https://www1.mcmaster.com/tooling-co...-locating-pins I designed the parts so that everything is symmetrical so that each side is rotated 120* and when the part is flipped over the other three sides are machined from the same program. The articulating arms use the same fixture/ locating pins and same program to machine them as there are only two part types: identical top and bottom plates and six identical arms
Angle fixture
Attachment 416524
Finding X,Y axis tooling ball center using center finding tool
Attachment 416526
Finding Z axis tooling ball center using height tool #1
Attachment 416528
Part on angle fixture