05-31-2016, 12:22 AM
When I had to stub the spindle motor shaft for my mill I was really pressed for a way to cut the keyseat. I only had the one mill so I mounted the shaft (5/8" dia) in a QC tool holder and an endmill in a collet in the lathe spindle. I dialed in the QC tool holder prior to installing the tool block. I also centered the shaft with the CL of the spindle using an edge finder in a collet and used the appropriate gage block to raise the tool holder. Used a 1/16" undersized endmill to rough in the keyseat then finished the width & depth with an on-sized cutter. Not the best key seat in the world, but good enough for gov't work. 