[TheForge] Speaking of hammers

Sun Apr 18 14:16:19 2004

While we're on the topic. <grin>

Sure, you could design a circuit to make a hammer do almost anything as long
as it involves going up and down. Pneumatics would be a poor choice though
as air compresses so the ram would have the characteristics of a spring.

Hydraulics on the other hand are solid. All you'd need to do is adapt a
Kinyon type control circuit to use hydraulics. A detail to consider is
cylinder pressure though. Self contained hammers operate with low pressure
high volume air, they have airways measured in sq/in where Kinyou type
hammers operate with high pressure low volume air and have airways measured
in fractions of a sq/in.

Designing a Kinyon type hammer to run on hydraulics would require a pump
rather than a compressor and considering they usually have a smaller ram
piston area need around 100 +/- psi. This is just a matter of figuring out
the volume/psi and ordering the pump.

The only problem I see would be the effects of a failure probably in the
valving that resulted in the ram stopping while the valve is open. It could
result in a catastrophic failure. (flying metal, broken and exposed bones,
blood etc.)

Frosty
------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

----- Original Message -----
From: "Andy Vida" <[email protected]>
To: <[email protected]>
Sent: Saturday, April 17, 2004 8:42 AM
Subject: Re: [TheForge] Speaking of hammers

> Now that we're on the topic, I have a couple questions.
>
> First, I'm more than a bit perplexed as to why nobody appears to have
> incorporated multiple valving schemes on a single hammer.  For example,
> having a hammer valved as in the KickAss would be very useful in some
> cases, assuming the proportions of the hammer loaned themselves to
> treadle-type work that the KA was designed for.  A simple switch of
> flow from the normal rapid fire scheme to the single shot/clamp
> valving for precise single blow operation.
>
> Also, not knowing that much about pneumatics, I have now long wondered
> if it's possible to have a control system that traces motion of the
> control device precisely in the ram.  What I mean is this: as the
> control device (let's just say it is a treadle to keep it simple) is
> depressed, the tup would advance that precise amout, proportionally
> speaking.  So if the treadle had a 4" travel and the tup 40", again
> to keep it very simple, and I depressed the treadle 2", the tup would
> advance 20", or half its travel.  I know this can be done hydraulically,
> e.g., when setting the depth of an implement suchas a plow in the
> ground,
> the tractor has a lever whose length of travel represents the range of
> depth the implement can be set to.  Can it be done pneumatically?  I
> suspect it can, but would like to know how.
>
> Related to this, can the speed of advance be controlled by the speed
> with which the control is operated?  So if I depress my treadle very
> rapidly to 2" the tup will advance downward with great force, but if
> I depress the treadle very slowly, the tup will kiss the work very
> gently.
>
> It would seem to me that for certain operations, having such precise
> control over both travel and force would be advantageous.
>
> -Andy
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