I have made my second cube,40mm x 4.Slightly different method,quicker and easier.Milled ,chamfered and centre drilled.Held in the 4 jaw as previous and
machined the largest cbore to size on all 6 sides.
Held in a 3 jaw as previous and machined the 2nd cbore to all 6 sides
Finished the smallest cbore with a 12mm milling cutter to all 6 sides
With the carriage stop set for depth and using the dials its quick and easy
Dims are within 2 thou And concentric to about 3 thou.Havent yet separated
A woodruff cutter or int threading tool would do but i will probably grind down
a small boring bar for the inner ones and a slightly larger one for the bigger
cbores.This one took about 3 hrs.They get easier and like GREMLINS will
keep multiplying.Any thoughts on variations.O for CNC