[TheForge] sesaw treadle hammer

Tue Feb 11 15:12:03 2003

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 =AF 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. =20

(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)
=20
 Bruce Freeman <[email protected]> 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.=20
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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