[TheForge] slit & drift question

[Bruce Freeman]

Without trying it, the simple geometric answer to
question one is 1" - halfway around the  1/2" bar. 
This would anticipate stretching the outer edges of
the 3/4" bar around the picket.

Using the common bending assumption that you measure
in the middle of the bar to be bent (in this case, the
3/8" on either side of the split) the answer would be
1.25".  This would anticipate stretching on the outer
edges of the 3/4" bar, and compression on the inner
edges of the split (bringing the split back down to
1/2" square, after opening it up.

Ergo, I'd anticipate needing something BETWEEN 1" and
1.25".  Intuitively, I'd expect the shorter split to
be better, but I haven't tried it.

In principal, either of these should be true whether
you align the pickets on the diagonal, or square to
the 3/4" bars, but reality will probably rear its ugly
head and prove that simplistic notion wrong, too.

I won't hazard a guess as to best material for the
chisel.  I'd start with a coil spring from a car...

Bruce
NJ




--- Dave Mudge <dave at magichammer.net> wrote:

> Dear TheForge,
> I have a couple questions that I think some of you
> my have answers for.
> I have a job coming up where I will have to pass
> 1/2" square pickets
> through 3/4" x 1-1/2" flat bar.
> I want to use the split & drift method.
> 1. How long does the split have to be to be in order
> to drift it out
> to 1/2" square? even through 3/4" flat bar?
> 2. What is the best material that may be commonly
> found in a machine
> shop to make the splitting chisel from?
> 
> thanks in advance,
> dave mudge
> _______________________________________________
> 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
> ___________
> 
> 
> 



       
____________________________________________________________________________________
Yahoo! oneSearch: Finally, mobile search 
that gives answers, not web links. 
http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC