[TheForge] Power hammer questions/Frosty

[Jerry Frost]

----- Original Message -----
From: <schade@acegroup.cc>
To: <theforge@mailman.qth.net>
Sent: Tuesday, April 08, 2003 11:42 AM
Subject: Re: [TheForge] Power hammer questions/Frosty



>
> i have been working thru this and have one more question. Do you know what
the relationship (volume) between the pump cylinder and the ram cylinder is
on the Massey hammers?
>
> Mark Krause suggested 2-1 for his Nazel takeoff. 2-1 seems to me to be too
much extra air to get rid of. Theoretically 1-1 seems like it would be
enough but...?
>
> Thanks.
>
> Bob Schade
>
>

I don't know Bob.

What I've done though is use calipers and scale to guestimate the
relationship between cylinders on the 3-4 patent drawings I downloaded and
they seem to average around 1.2 : 1,  Compressor : ram. I'm not averaging in
the Nazel fluid drive hammer. Also, some of the pistons are so complicated
my guestimate is on the extreme side of guessy. (maybe gassy? <grin>)

If I recall correctly three people have said the modern hammers are running
1 : 1 @ 15 psi. Of course I may be recalling one person more than once.

The basic assumption I'm making regarding displacement and ram weight goes
something like this:

The ram piston's movement is determined by the compressor's, delayed by the
distance and time necessary to accelerate the ram weight.

If this is true then as long as the volume ratio is balanced, oversizing the
pistons will mean a closer synchronization between them with less effect
from ram mass.

In short oversized pistons will lessen the working pressure and the chance
of the ram piston bottoming out on the return stroke.

It will not reduce the amount of motor necessary to power it of course,
probably increase it actually due to the added friction of the larger
pistons.

Of course that's just my opinion, I could be wrong.

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

Meadow Lakes, AK.