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What Bill said. Plus, in the unlikely event that you can't get a drill
bit
in the range of .002 - .005" less than your reamer size, it's okay to
drill smaller. I've reamed holes that were .010" smaller than finished
size with no apparent degradation in finish, but the tool life
certainly
suffered. OTOH, I would only expect that to be a problem if the
tool was expected to ream hundreds of holes.
Dale R.
wrjjrs@aol.com wrote:
For the mechanical engineering comment of the day; Most o-ring
seals REQUIRE a 32 microinch finish. This will NOT happen with a drill.
For your injector o-rings you are sealing gasoline. (obviously) No
halfway measures here! You simply MUST have a totally leak-free seal.
Get the correct reamer. They are easily available in metric sizes. For
the best finish leave .002-.005 in. of material when drilling. A 32
microinch isn't mirror-like, rather it is flaw free. (no scratches at
all) Usually a shiny surface.
Bill Jepson
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