[TheForge] Treadle Hammer Anvil Stand

[Andrew Vida]

I must agree.  Rigidity is more important than mass.  A 50# chunk of 
good steel will function far better than 5000# of raspberry Jello.

xlch58 at swbell.net wrote:
> Bruce Freeman wrote:
>> What matters is the overall weight of your TH anvil.  I vaguely recall
>> a recommended hammer-weight to anvil-weight ratio of 1:5 or 1:10.  So
>> if your TH hammer is, say, 50#, you want an anvil of at least 250#.
>> 5" square x 36" tall steel is ~250".  6" round x 36" tall is a little
>> more.  Hence, skip the stand and just use a vertical piece of steel.
>>
>> Bruce
>> NJ
>>
>>   
> Sorry, I have to disagree.  Mass is not mass when it comes to anvils.  
> What matters is maximizing the contiguous mass directly in line with the 
> hammers blow.   I have noodled over the dynamics of anvil and hammer for 
> as long as I have had both.  After many years I found an older book 
> about stress wave propagation in solid materials, which was a difficult 
> read, but I think pointed the way for me.  Since then, I have had the 
> opportunity to see some finite element analysis of stress wave 
> propagation from impact (generally bullets, but sometime something more 
> prosaic)  If the material is contiguous, then the impact will reflect 
> back directly and there numerous secondary impacts as a result as the 
> system "ringing"  If there are discontinuities, then the reflections are 
> refracted and not as much energy goes into the secondary impacts.  This 
> is why vertically oriented material does better than welding up 
> horizontally oriented material, though solid is still supreme. 
> Charles
> 
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	-Andy V.

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