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

Mon Jul 14 07:03:00 2003

A steel shim would work best for Bob's idea of a totally flat surface done
with a carbid bit.   The copper shim would work for a surface that is
inconsistent.

Ralph
----- Original Message -----
From: "Mike Spencer" <[email protected]>
To: <[email protected]>
Sent: Sunday, July 13, 2003 3:02 AM
Subject: [TheForge] Re: Advice? Air hammer die and anvil fit-up

>
> ralph> Mike, If you do have it to 1/32 of flat and perpendicular with
> ralph> the tup - why not put a piece of 1/8 to 3/16 copper under it to
> ralph> let it pound itself into a flat plane.
>
> I don't know why not.  Would that hold up fair to middling, do you think?
> Would a mild steel shim be better?  Worse?
>
> ralph> Copper plate under the die seems like the fastest way to correct it
> ralph> (especially if your just trying to get it running to see if it will
> ralph> work for you...
>
> That's the idea.
>
> bob> If the upper area is flat, you can use a router with a carbide bit to
> bob> machine the lower area.
>
> Yow!  Good idea -- for next time.  I've already leveled the floor of
> the dovetail with a cup stone.  Had to take off a lot of metal and
> that's why the top surface of the anvil is now too high.
>
> charles> Someone suggested a router with carbide bit , but this would
> charles> lower the dovetail floor, not raise it.
>
> Exactly. (That was Bob Bergman.)
>
> charles> ...maybe the 16 guage sheet metal screwed down with
> charles> countersunk screws would work best.
>
> So, has anyone seen dies shimmed this way, either with copper or m/s?
>
> charles> ...I would expect that what you want is all of the force of
> charles> the hammer transmitted to the floor of the dovetail slot, not
> charles> the cheeks.
>
> That's right.  But the working surface of the die extends out over the
> cheeks.  If the cheeks of the die stand above the anvil surface, blows
> struck such that all the impact is over the cheek will tend to tip
> the die, creating hugely exagerated upward force on the opposite side
> of the anvil dovetail.
>
> I may be worrying about this more than I need to but the suggestions
> and comments are helping my thinking about it.  I took the day off
> from working on the hammer to see what you guys had to say and to
> think about it.
>
> Instead, I worked on a "comeback" job.  Years ago I made a pretty nice
> firetool set and stand, wood rack with roses, shelf brackets with
> padulas [1] and other sundries.  Their house burned down and pretty
> much all they recovered from the front 2/3 of the house was my iron
> stuff.  Badly rusted and a bit warped but everything is cleaning up
> pretty well.  Have to make three replacement parts.
>
> - Mike
>
> [1] His wife is a hooker.  Er, rug hooker, that is.  Hookers call
> generic flowers of no particularly identifiable type "padulas".  Not
> in my dictionary but I think it's in the OED.
>
> --
> Michael Spencer                  Nova Scotia, Canada
>
> [email protected]
> http://home.tallships.ca/mspencer/
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