[TheForge] need help from heavy metal math guys

Sat Nov 22 18:29:01 2003

I agree with Chuck. I made a C style press that I use for hot forging. 
I'm quite happy with the press, but it could take up a lot less space 
built as an H style and I don't think I'd ever miss the open side. If I 
make another, it will be H style. This depends, of course, on if you can 
get by without the open side. Maybe your work requires it.

If I understand you right, you want a C press with a 20 inch throat. 
This is very large for a C. For example, my press is sized for 36 tons 
(I'm only using it at 30 tons), and the distance from the column to the 
far edge of the die holder is 10". The column consists of an I beam with 
an 18" web; the front of the I beam is reinforced with a piece of grader 
blade 3/4" thick and 8" wide running the full 7' length of the beam. It 
flexes visibly (just a bit) at 30 tons pressure. Doubling the throat, 
even at a lower tonnage would require a very strong column.

I built mine following Jim Batson's discussion of press design in his C 
frame hydraulic forging press plans. He has since added H frame plans. I 
think these are well worth the money for anyone building such a beast. 
You can get them from Norm Larson ([email protected]).

Steve Smith

Chuck Robinson wrote:
> Forget the "C' frame and make an "H" frame instead.
> The "C" frame press would have to be pretty massive to avoid frame flexing
> with your rams tonnage. You should also cycle the piston with compressed air
> to measure the length of stroke.
> Chuck
> ----- Original Message -----
> From: "John Emmerling" <[email protected]>
> To: <[email protected]>
> Sent: Friday, November 21, 2003 8:48 PM
> Subject: [TheForge] need help from heavy metal math guys
> 
> 
> 
>>I recently came upon an 8x20x3.5" double acting hydraulic cylinder.  I
>>would like to build a "C" frame press and basically sandwich the
>>cylinder in the opening at the top of the C. I want the opening to be
>>approx. 20"h x 20" deep. My thinking is to use 1" plate with stiffeners
>>btw the two plates. Is 1" enough,  and if so, how much surrounding steel
>>is necessary? From rough calcs, the cylinder will push 120k and pull
>>105k. All help and suggestions are greatly appreciated.
>>Thanks
>>John Emmerling
>>
>>
>>
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