01-11-2015, 05:55 PM
If your hel bent on cutting that pristine shaft, (just joking) how about a compromise. Cut one inch off and make the bore in your adaptor 2 inches deep. The extra support there should stop any flexing.
Try doing the bore first and see how it goes. Drill out to 5/8 and you won't have much to machine, go deep with the drill and ignore the point on the bottom of the hole.
Can you machine the adaptor with the lead screw attached? If so i'd be tempted to bore the hole 2 thou undersize heat it up and shrink fit it to the lead screw then machine the adaptor to run true to the thread. With a shrunk fit there would be no flex and all the elements would run true.
Try doing the bore first and see how it goes. Drill out to 5/8 and you won't have much to machine, go deep with the drill and ignore the point on the bottom of the hole.
Can you machine the adaptor with the lead screw attached? If so i'd be tempted to bore the hole 2 thou undersize heat it up and shrink fit it to the lead screw then machine the adaptor to run true to the thread. With a shrunk fit there would be no flex and all the elements would run true.
Free advice is worth exactly what you payed for it.
Greg
Greg