I've tried them all. Lautard's toolmaker's, Gingery's "d-bit" ,
Duplex's D-bit and professionally made reamers. The only one which make
a hole sized "correctly" for a given diameter of drill rod is the
professional one. The one's I make are making holes which are too
small. I somehow have managed to make W2 shrink in heat treatment!
Or more likely, I am not honing these things correctly after I
temper them. Are there any online guides as to how to sharpen then hone
shopmade reamers? I've read that your are to hone the flat, not hone
the flat, hone a radius on the leading edge, leave the end flat, etc...
Its such a simple thing, yet I am spinning around aimlessly.
I have the Howe Gunsmithing book and am reading it. Unfortunately, I
don't have the equipment to make multiple flute tools at hand. I want
simple holes for shafts. Am I expecting too much?
For example, I would very much like to make a simple coil winder. I
would expect that the winding shaft would go through a reamed hole in a
block of aluminum. That hole should have a "close" fit.
I know could use oilite bearings for this. However, aren't they
oversize on purpose so when pressed in they constrict to the intended
shaft size? If so, I need an accurate hole in which to press them. Back
to the reamers.....

Andy

TheAndroid wrote in message
ups.com...
I've tried them all. Lautard's toolmaker's, Gingery's "d-bit" ,
Duplex's D-bit and professionally made reamers. The only one which make
a hole sized "correctly" for a given diameter of drill rod is the
professional one. The one's I make are making holes which are too
small. I somehow have managed to make W2 shrink in heat treatment!

How about making your D bit reamers a thou oversize, ream a trial bore,
measure it and then polish the cutting end down accordingly until it cuts to
size?
--
Dave Baker
www.pumaracing.co.uk


*** Free account sponsored by SecureIX.com ***
*** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com ***

Try O-1.

With a 400 degree F temper to Rc 62 it should expand by .0014" per inch
dia.

Then polish to suitable dia.

Wolfgang

On the oilite questions, I have had several embarassing failures with
oilite bushings, particularly in smaller sizes. Some of the bushings
have to be machined after pressing (and not spin in the bores) , so I
give a good strong fit with a vise or hydraulic press. And the inner
bores look like washboards! I typically have to drill and ream the
bushings, which are intended to be a finished size.