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

Tue Jul 15 02:02:01 2003

How bout  using the hammer to seat the die on a hot shim that would  be 
forced into the depression beneath the die?   PF

Ralph Sproul wrote:

>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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>>Login:  [email protected]
>>password:  anvil
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>>    
>>
>
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