> You can get away with using
> just a taper tap for a through hole in relatively thin material.
Through holes, use a gun tap. And don't back off. The gun tap pushes the
chips forward, so you you tap in one pass.
One instructor I had always used a gun tap in blind holes, also. He did
half the hole with the gun tap (no backing off), then removed it, blew out
the hole, and finished with a plug tap.
> Good cutting fluid is a must when tapping.
Except in cast iron. Always tap cast iron dry or the stuff can crumble on
you.
Phil Ethier West Side Saint Paul Minnesota USA
1970 Lotus Europa 65/2597, 1992 Saturn SL2, 1986 Suburban, 1962 TR4 CT2846L
pethier@isd.net http://www.mnautox.com/ http://www.lotusowners.com
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