Slightly embarrassing question about shop made reamers.
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 |
Slightly embarrassing question about shop made reamers.
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 *** |
Slightly embarrassing question about shop made reamers.
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 |
Slightly embarrassing question about shop made reamers.
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. |
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