[TheForge] 15Ton Press

Thu Jan 17 13:56:00 2002

Hey Ed,
You have gotten me a little confused,
A "22 gpm" 2 stage pump  puts out 22 gpm / 6.5 gpm at 3600 rpm with a 10 hp
motor.
When you couple it to a 1800 rpm 5 hp motor you now have an 11 gpm / 3.25
pump, not 22 gpm.
So at low pressure Keith's ram is moving about 2 ips. Once it contacts the
work at high pressure it is moving a little over .6 ips.
You need to read Jim's primer again.
Also look at my design again.  The bottom die is stationary. The top die
moves. The square guides resist all side loading forces and you can attach
the cylinder to the frame with enough clearance (slop) so that it doesn't
see  the side loading.
 If you intend to do extreme  off center work , that you know will be
generating large  side loading forces, I would recommend using the 2
cylinder version of my design to avoid over stressing the frame.

The bigger pump and new cylinder should work better. The rod diameter should
also be fine in my design.
Chuck

----- Original Message -----
From: Ed Fasula <[email protected]>
To: <[email protected]>
Sent: Thursday, January 17, 2002 5:37 AM
Subject: Re: [TheForge] 15Ton Press

> Steve and Chuck,
>
> I just got the video on Bob S.'s tip ("keith johnson did a demo at the
> bemidji minnesota meet last spring using his hyd press. if you are an umba
> member you can get the video from rog degner for a few bucks. well worth
it.")
>
> Keith is running a 5" cylinder using 22 gpm.  Whoa!  Thats over 4
> ips.  Have you guys seen the video?  It doesn't seem like its going too
> fast, but its way more than you guys and Batson recommends.  Keith holds
up
> Batson's book, so I don't know what the deal is.   He's also using a 5 hp
> motor while Batson recommends a 10 hp for that pump.
>
> He does demonstrate using a bypass valve.  I wonder if he doesn't have it
> set partially open all the time.
>
>  From what I hear about noise and rpm, it may be worth considering getting
> a larger capacity pump and running it at a lower rpm (less than 1800)
using
> the vfd we discussed before.
>
> Ed
>
>
> _________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com address at http://mail.yahoo.com
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  [email protected]
> password:  anvil
> ___________
>
>