Reply by Jim Jakosh

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Posted on How can a standard sized drill hole be accurately enlarges?

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Jim Jakosh

26813 posts in 4353 days

#1 posted 11-20-2015 02:14 AM

Hi Mike, You could take a 11mm drill and spin it backwards over a belt sander until it get to .406” (11.3mm).

13/32 is just the right drill for that hole so you can make you one from a metric.

But it sounds like you are drilling wood so the best way to do that uniformly is to drill the 10mm hole. Then take a small wood dowel , saw a slit in the end about 1/2” long and then cut strip of about 100 grit sand paper to wrap around the dowel and trim the length until it is snug in the 10 mm hole and lap it out to 10.3mm. It won’t take much to remove .012”. (By the way, that seems like a lot of clearance for an 10mm shaft)
We used to do that in the tool room to lap out hardened steel blocks for the proper dowel fit when we did not have a regular lap with compound on it. I have used this method many times for a proper fit in wood, too.

cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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