[TheForge] sesaw treadle hammer

Wed Feb 12 12:29:00 2003

Not sure how it's applicaple but just running it through my mind, and well I'm using my mind so...       
 Bruce Freeman <[email protected]> wrote:Not sure how the compound bow mechanism would help. A compound bow delivers a strong pull through most of its stroke, but only a weak one at full extension � where you have to hold the arrow to aim. How is that applicable to a treadle hammer?

The Grasshopper uses an eccentric pulley - effectively a continuously changing lever arm - to balance the continuously changing force of the spring with the (surprise!) continuously changing torque of the ram. Yes, the torque of the ram changes as the arm changes angle. 

(If instead, you put the ram on rollers or sliders and hang it from a cable above, then there is no torque per se, and the weight of the ram is unchanging. Get a strong equal-force spring and you're home free. Unfortunately equal-force springs are typically quite weak.)

Good luck,

Bruce
NJ

>>> [email protected] 02/11/03 02:08PM >>>

Bruce, hmm maybe a self contained weightless ram.
Been thinking, and darn I know it is dangerous, but that never stopped me before.
Wondering about the compound bow mechanism anybody played with that one??
too nice a day to be inside (BIG LONGING SIGH)

Bruce Freeman wrote:Mike,

Between the speed and the pine test, it sounds like you've pretty much confirmed my observations from 1998.

You could skip the see-saw mechanism, and simply balance the ram by a means similar to that used in the Weightless Eammer. I suspect the mechanism used in the Grasshopper Treadle Hammer might also work, but that was calculated for a slightly different mechanism than a swing-arm hammer, so I'm not sure.

Bruce
NJ

>>> [email protected] 02/10/03 01:51PM >>>

Well it belongs to a friend of mine I'm guessing a at a 10,15lb head and maybe twice that or a bit more on the back side. 
he kinda just stuck it together, had to beef up the arm, 1-1/2" pipe, (it kept bending)
We stuck a piece of pine in it and stepped on the pedal. it would compress the pine about what you'd expect from swinging a ten lb without a lot of oomph behind it.
DragonsWatch wrote:Hi Mike,
What is the total weight of your ram/counter weight? Do you figure you are getting a comparable blow to another TH with the same weight?
Inquiring minds want to know :-)

Thanks,
Larry

Mike Sweany wrote:

> I did see a sesaw/counterweight style treadle hammer last weekend .
>
> Upright, hammer arm was mounted at and angle to the upright, bush down on treadle, whack. Counterbalance returns the hammer head for the next blow.
>
> Not fast not elegant but it will sure deliver a good whack. the anvil was adjustable in height to maintain a square blow .
>
>
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