[TheForge] slitting and drifting help needed

[April & Bill Clemens]

>From " A Blacksmith's Craft - The Legacy of Francis Whitaker"

Round Hole Slit Length: Hole Diameter PLUS 40%

Square Hole Slit Length: Hole Perimeter TIMES 45%

Bill Clemens

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of robert hensarling
Sent: Monday, February 13, 2006 8:38 PM
To: theforge
Subject: [TheForge] slitting and drifting help needed

Guys, is there a reference, or chart maybe, of what size slitting chisel
to use for a given drifted hole diameter?  In other words, if I want a
drifted finished hole size to be 1/2", what size of slitting chisel
would I use, not only for this size, but 3/16th's, 1/4, 3/8th's etc. I'm
referring to the "canoe" shaped slitting chisel.
 I understand that a slit and drifted hole will increase the overall
length of a given piece of steel, and a punched and drifted hole will in
fact be a little less.  Do I have this correct, or am I backwards?  
Thanks for the info!
Robert Hensarling
Uvalde, Texas
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