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  #31 (permalink)  
Old 07-07-2007, 11:35 PM
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Originally Posted by Metal Twister
I want to answer you! but ive got to get a little work done today... advantage or disadvantage of self employment.Ha Ill be back this evening. thanks for everything guys!!!
A couple of build pics of the press. FYI







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  #32 (permalink)  
Old 07-22-2007, 01:35 AM
 
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pressbrake unequal pressure with off-center work

Don't know if you have solved your problem yet but here's my two cents. How about using a long heavy shaft as your fulcrum for both levers? Then you would need adjusting turnbuckles in your final link to accomodate any tapered brakes you may want to do. Can't think of any way of doing it in the hydraulics that would be possitive enough. Hope this helps. P.S. Thanks for all the great pics. Been wanting to build one of these things for years but didn't know how to go about it.
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  #33 (permalink)  
Old 07-23-2007, 01:52 AM
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Quote:
Originally Posted by gerald
Don't know if you have solved your problem yet but here's my two cents. How about using a long heavy shaft as your fulcrum for both levers? Then you would need adjusting turnbuckles in your final link to accomodate any tapered brakes you may want to do. Can't think of any way of doing it in the hydraulics that would be possitive enough. Hope this helps. P.S. Thanks for all the great pics. Been wanting to build one of these things for years but didn't know how to go about it.
Thanks, I found a mach/ fabricator forum, they seem to think a 50/50 splitter is th solution.? Im still looking into it. I will let you know what i find. Other than the one glitch the machine works great. I bend up 1/4 spindels on it or 20 ga sheetmetal, I encourage you to build one.
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  #34 (permalink)  
Old 09-27-2007, 02:08 AM
 
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Phasing rams

I hope you have solved your problem. If not we use phasing rams on some of the equipment we manufacture, which would solve your problem easily. phasing rams are plumped in series ie for 2 rams top port on first ram is plumped to lower port on second ram. You use for example one 3" & one 3 1/4" ram to allow for oil displacement.

http://members.westnet.com.au/ptehyd/slp.html
Methods of bypassing traditionally have included internal barrel grooving, pin holes (leading to port cap) in cylinder walls and flow dividing devices.
Flow dividers are expensive to purchase and have greater inaccuracies in rod extension rates, while barrel grooving continues to damage piston seals. Pin hole design also damage seals, in addition are prone to blockages by contaminants and cause the oil to heat and foam.
Another major advantage of Phasing Cylinders is its accuracy in synchronised lifting with multiple series cylinders having less than 2% variation between rod extensions. This reduces torsional stresses from misalignment and therefore reduces the amount of framework required in structural fabrication.

Phasing rams are commonly used on farm machinery so should be easily attainable.
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  #35 (permalink)  
Old 09-27-2007, 10:01 AM
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We have brakes at work and even with our new one, if you don't run parts in the center it will now set down evenly.

Kevin
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