I need to drill a (fairly) accurate 5mm hole in aluminium to hold a 5m
silver steel rod, which will be acting as a pivot. I thought silve steel was fairly accurately cut to diameter, so I first drilled a 4. mm hole in the aluminium as I read that drill bits tend to cu oversize. The s.s. wouldn't fit, wouldn't even enter the hole. So opened the hole out to 5mm. Still wouldn't enter (and a micromete check on the s.s. showed it as about 4.97 mm). A tiny touch of filing still no fit. In the end I had to use a 5.1mm drill before I could ge the s.s. through. What gives? Should I invest in a 5mm reamer?
Brenda
-- anotheri
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