[TheForge] Re: Advice? Air hammer die and anvil fit-up

Sat Jul 12 08:31:00 2003

Mike ,If the upper area is flat, you can use a router with a carbide bit to
machine the lower area. You won't get it all but you will establish a flat
that you can finish with hand work. This is a tip from Sid Seudimeier.
----- Original Message -----
From: "Mike Spencer" <[email protected]>
To: <[email protected]>
Sent: Friday, July 11, 2003 11:32 PM
Subject: [TheForge] Re: Advice? Air hammer die and anvil fit-up


>
> Charles wrote:
>
> > Cast Iron has great strength in compression, but has relativley poor
> > strength in tension or shear ( the reason so many dovetails are
> > broken off power hammers,
>
> Yeah.  The edge of the dovetail slot in the anvil is badly chipped,
> too, but I think there's plenty to hold the die if I make a good,
> full-length wedge.  It also has a key in the side opposite the wedge
> that will prevent the die from moving lengthwise along the slot.
>
> > As far as lowering it, the traditional method would be a cape chisel
> > to create grooves, followed by cold chisel, followed by files.
>
> Right.  I did know that.  I was hoping someone would have had
> experience using a belt sander and could tell me it would be easier and
> faster that either chisels or  grinders.  I *am* going to have to do
> some chisel work on the keyway mentioned above.
>
> > M.T. Richardson's Practical Blacksmithing quotes a reasonable
> > repeatable days work with a chisel to be a 3/4 " wide, 1/16 " deep
> > groove 600" inches long in cast iron.
>
> Gee, that's 3 square feet of surface.  I'll have to fool with that a
> bit.
>
> > Personally, for what you have left, I would use a 16 inch nicholson
> > double cut file.
>
> I use small files and a 10" mill smooth or mill 2nd cut a lot.  I
> don't think I even have a big mill/flat bastard.  Cut down two
> ca. 5"x12" surfaces by 1/16 or so?  Seems like a whole lot of
> filing. Maybe I've underestimated the power of big, coarse files.
>
> > ...no sparks or embers flying into every ship recess.
>
> In the case of cast iron, it's graphite dust everywhere.
>
>    "You're not just dirty.  You're *incredibly* dirty!"
>
> - Mike
>
> --
> Michael Spencer                  Nova Scotia, Canada
>
> [email protected]
> http://home.tallships.ca/mspencer/
>
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