No machining is required without the drill rod using acme screws. Screw carrying shaft collar, thrust bearing, radial bearing in bearing block, second thrust bearing, second shaft collar, motor coupler. That's it. The drill rod, as I said, is to prevent the thrust bearing races from falling into the screw threads on fine pitch screws. Personally I don't like it as now the screw is not support directly in radial bearings. |