If I were doing it I would drill a 1/4" hole on center and then use a 1 1/8" drill bit at a slow speed. If it seemed hard I would get a masonary 1 1/8" drill bit. In my tool shop, rather than to wait 2 days to get a carbide I would, if I only needed one or two holes drilled quickly, run down to the hardware and get a masonary bit. They work just fine in harder steels.
Re: Drilling a 1-1/8 in reply to Dick L, 10-22-2012 08:44:24
We used drills like that in an old drill press we had at work. It didn't turn very fast, but would do the job. I found another big drill press in the Federal Stock System and I bought it back in the early 1980's before I retired. The man that replaced me has 51 years with the government and they still have both drill presses. His wife wants him to retire in Jan 2013. Hal
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