[TheForge] Power hammer questions

[Jerry Frost]

>
> I changed it to selfcontained.  I
> used frosthammer for theforge use.
> It's not like you were going to start
> getting royalty checks.  ;-)
>

I just didn't want folk thinking I invented the thing. Didn't think of
royalty checks though. DANG!

>
>
> I'd
> >suggest anybody wanting to follow this make their own sketches on graph
> >paper. (I like graph paper . . . A LOT)
>
>
>
> You're probably just saying that cuz
> you have some.
>

Well . . . . .YEAH. Lots. Take it everywhere, work, vacation, the coffee
shop on my days off. You mean . . . Everybody doesn't!?! <gasp>

>
>
>
> Having the ram down at idle is no problem
> for me. It should raise with a little tickle.
> The clamp I have no use for. I already have
> a vice.
>

I don't know how this configuration will act when you tickle the valve.
However, I THINK it would pump up over a few strokes possibly bouncing on
the anvil a couple times on the way up.

I haven't thought of a real use for the clamp function my vise won't perform
either. There is however something else this function does that is useful
and that's a dead blow. I wouldn't design valving specially for either
function, however with the Massey valve scheme, lift at idle and clamp/dead
blow come together and I like the ram lifted at idle.

> Another question is this. When the ram comes
> down on a piece of say 1" material where
> does the extra air from the pump go? Does it
> compress in the cylinder?
>
>
Yep, it compresses but from what I've heard even peak pressure spikes seem
to run around 15-20psi. If it caused overheating or motor drag it'd be easy
to put pressure reliefs in the compressor cylinder.

>
>
>
> How do these work? Where would they go in my
> drawing? Would they dump the extra air I
> mentioned above?
>
> Bob
>
> clear blue sky and cool air here
>
>

Where do which go?

In Massey's drawings the piston ports are centered in the compressor
cylinder wall and the compressor piston is very thick, just shy of the
stroke length. This way the top or bottom of the piston opens the ports at
the bottom of the stroke in either direction.

If the compressor has a 6" stroke, the cylinder would be 12" long and the
piston would be say 5 3/4" thick. The cylinder's balance ports are several
holes around the mid point of the cylinder. At top and bottom dead center
the 5 3/4" piston would expose the holes to ambient pressure on the vacuum
stroke.

What I called interrupted rods are flat spots like wrench faces in the
piston rods, close to one end of the stroke or the other. They open the
cylinder to ambient pressure when the piston stroke exposes the
flats/interruptions through the seals.

Clear, mid to high 30's light breezes.

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

Meadow Lakes, AK.