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

Sat Jul 12 19:35:01 2003

Charles, If you could get the bottom of the die section flat........then
shimming is an easy task.  You could even drill and pin in a new bottom for
the 1/16 to 1/8 you'd be removing to allow a single steel shim to be used to
bring the die to correct height and not have dovetail problems on the
shoulders.

Ralph
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Saturday, July 12, 2003 1:14 PM
Subject: Re: [TheForge] Re: Advice? Air hammer die and anvil fit-up

>
>
> Mike Spencer wrote:
>
> >Charles wrote:
> >
> >
> >>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
> >
> Didn't catch that it was two 5"x12"  areas.  I can see why you are
> looking for powered alternative.   For some reason, I was picturing it
> an inch or two wide.   The problem with filing really wide flat areas
> like yours  is  there are too many file teeth in contact.   I have a
> couple of large files with a VERY slight belly side to side in them that
> work in this mode, but have not seen them sold new.   I have also used
> vixen files in a carrier that will put a slight belly end to end in
> them, but have only used these on mild steel.  I would expect cast iron
> would take the edge off the teeth of a vixen pretty quickly.    In your
> case, maybe the 16 guage sheet metal screwed down with countersunk
> screws would work best.    Someone suggested a router with carbide bit ,
> but this would lower the dovetail floor, not raise it.   Typically,
> cleaning up the anvil would result in the top surface being removed,
> with the dovetail floor too high, in which case that would be a great
> way to go, but you seem to have the  opposite problem.   Someone with
> more experience of large power hammers should correct me if I am wrong
> here, but I would expect that what you want is all of the force of the
> hammer transmitted to the floor of the dovetail slot, not the cheeks.
> Unless the top surface of the anvil interferes, the wedges will force
> the die into closer contact with the floor of the dovetail.  This being
> the case, you may want to use an even thicker spacer in the bottom to
> insure that the primary contact is on the floor of the dovetail.
>
> Charles
>
>
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