[TheForge] slitting chisel / drift

[dan tull]

Dave,
Why go to the trouble of heat treating HOT work tools?
How long would it take a thin slitting chisel to reach 700dF when in contact 
w/ 2000dF
orange hot steel?
I have been using spring, as forged, for about 19 yrs. w/ good life.
IMHO.


----- Original Message ----- 
From: "Dave Mudge" <dave at magichammer.net>
To: "theforge mailist" <TheForge at mailman.qth.net>
Sent: Tuesday, January 22, 2008 3:36 AM
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
> _______________________________________________
> Manage membership or unsubscribe at:
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  blacksmithblacksmith at hotmail.com
> password:  anvil
> ___________
>
>