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Steve,
Reaming will usually produce a better finish than boring. Carefull boring CAN produce a good finish but it is much slower.
Bill Jepson
-----Original Message-----
From: cozy4pilot@gmail.com
To: flyrotary@lancaironline.net
Sent: Thu, 26 Oct 2006 5:50 AM
Subject: [FlyRotary] Re: Rotary Roundup
Dale or Bill,
I was told that a boring bit would yeild a smooth bore. Is that the same as a reamer, or is it different ?
Steve Brooks
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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