[TheForge] slitting chisel / drift

[Grant Marcoux]

Dave:   This offset slitting is done by slitting an offset hole and drifting
the hole at an angle, using first an undersized round drift and then a final
size drift of the shape you want.  In other words, you make two slits, one
at the upper face of the member the pickets go through, and a slit on the
lower face.

 These length of these slits must be equal to the total length of a slit you
would use for a non angled picket.  The key here is to make the ENDS of
these slits overlap, one on the upper face, one on the lower face, with your
center being the center where the slits overlap.  Once these slits are
opened, the angle will be present when drifted, it is the overlapping of the
slit ends on two faces that makes the angle possible.

Try this in modeling clay,and you'll see

Grant

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net]On Behalf Of Dave Mudge
Sent: Tuesday, January 22, 2008 12:36 AM
To: theforge mailist
Subject: [TheForge] slitting chisel / drift


Friends, I need a little advice on two issues.
1. Although my new shop is not up and running yet I have a temporary
set-up in the machine shop where I work.
Air hammer, gas forge, anvil, swage blocks etc.
We have a job coming up where I will need to slit & drift 1/2" square
holes in 3/4" x 1-1/2" flat bar on 6" centers.
I have no identifiable tool steel (other than automotive coil springs)
from which to make the slitting chisels and drifts.
Can someone give me the process for hardening & tempering forging
tools made from automotive type coil spring?

2. This is a railing. Imagine the afore mentioned 3/4" x 1-1/2" flat
bar as a wave running the length of a section of railing.
The 1/2" square pickets will pierce the wave on 6" centers.
The holes to be slit & drifted to size will have to be on an angle
that would be on tangent with the straight pickets and the
curves of the wave. Piercing the bar on the flat would be one thing,
but piercing it on an angle is quite another.
Any advice on how to do this would be appreciated.
thanks,
dave mudge
Bogalusa, Louisiana
dave at magichammer.net
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