Posted by Janicholson on December 19, 2011 at 20:54:07 from (96.24.99.126):
In Reply to: Re: Drilling a shaft posted by rustred on December 19, 2011 at 20:33:44:
I machine parts every day, and teach it. I am not claiming it is a great solution, I would make a jig in the machine shop, and drill it. But that is not what he asked. Differential speed between them is not more than 700 or 800 RPM, with a 3/16 bit making a pilot hole, there is no issue. A dull drill bit, or a cheap drill bit never makes good holes. It might take a cobalt alloy bit to do the job, but he was interested in centering, not drill quality. I do not know what he needs the hole for, but again, it is his unit. If he needs to thread the hole, to retain a pulley or device, I would use a cross drilled hole, or the groove used in most shafts for retention. Jim
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