[TheForge] Power hammer questions/Frosty

[Jerry Frost]

----- Original Message -----
From: "Shannell Sugrue" <sjs@ihug.com.au>
To: <theforge@mailman.qth.net>
Sent: Thursday, April 10, 2003 3:33 PM
Subject: Re: [TheForge] Power hammer questions/Frosty


> >I've left it out
> >simply because I have no idea what kind of partial vacuum to expect but
for
> >my own guestimating I've been using -10psi
>
> Did you mean negative 10psi? or 10 psi, 0psi would be a perfect vacuum
> wouldnt it, or did you mean -10 psi from atmospheric so 5 psi? or when
> talking about vacuums on earth with its atmosphere do we use negatives if
> under 14.6???
>

As you've so admirably demonstrated I don't even know how to describe a
vacuum properly. <grin>

What I meant is 10 psi. below ambient. (-10psig?)

An absolute pressure would be a variable. And a negative absolute pressure
science fiction. In practical terms the machine will have to operate in
ambient pressure. So the pressure differential between the positive and
negative sides of the piston is what counts.

I'll be more than happy to agree to a proper or common term so we all know
what we're talking about. Preferably something simple like psi. so I can
keep the force figuring easy. (for me anyway <grin>)

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

Meadow Lakes, AK.