"Dave Baker" wrote in message
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Harold and Susan Vordos wrote in message
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"Philippe Gravelle" wrote in message
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I can only assume the subject says it all.

The only way to repair rusted reamers is to regrind them to a different
size--------unless one can be happy with a tool that doesn't cut well.
It's
not something that one can do without a cutter or precision grinder, but
best done on a precision grinder. Even then, the results would be
questionable.

Harold

Got to disagree I'm afraid. As reamers only cut on the leading edge I
don't
find it makes much difference what condition the flutes are in provided
there are no high spots. I've got a selection of old reamers with rust
specks all over them which I get from the local second hand tool shop for
a
quid or so each and they all cut fine and to their nominal size. A quick
lick down the flutes with an oilstone to remove any burrs is all any of
them
have needed to become perfectly serviceable. The leading edge can be
resharpened as often as you like without altering the size.
--
Dave Baker - Puma Race Engines (www.pumaracing.co.uk)

There's rust, and then there's rust. There was no information provided so
I responded to the worst case scenario. Can't speak for you, but I've
ground (for size) and sharpened more than my share of reamers in my day and
have a pretty good idea of what it takes to get one to cut size------and not
seize in the hole, or tear it up due to chip welding.

I agree with your comments if the reamer has superficial rust. I totally
disagree if it has more. Notice I didn't say the reamers wouldn't
cut----I simply claim they cease to be a precision tool, such as reamers
are.

Harold