[TheForge] slitting and drifting help needed THANKS!

[robert hensarling]

Thanks to all of you for the answers, it really helped!  Looks like the 40% 
rule is the one to follow.  Demon, you're right, a 3/16th's" hole would be a 
little small to slit.
Appreciate the help all.
Robert
----- Original Message ----- 
From: <marc at ironringforge.com>
To: <theforge at mailman.qth.net>
Sent: Tuesday, February 14, 2006 6:34 AM
Subject: RE: [TheForge] slitting and drifting help needed


>I think by slitting you lose length. A slit length is actually longer than 
>the
> hole diameter. You can calculate each side of the slit to be 1/2 the 
> perimeter
> of the circle, minus a little for the eventual "stretching" when drifting. 
> When
> you drift, the sides of the slit bump out to form the circle, and that 
> will draw
> the top and bottom of the slit together, making tyhe piece shorter.
>
> A punch squishes the metal in all directions before the biscuit punches 
> through,
> and that would lengthen the piece.
>
> --Marc
>
>> -----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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