swellwelder
Stainless
- Joined
- Sep 21, 2002
- Location
- Valley City, ND USA
I was trying to use my hydraulic brake press today,(shop built by me, but that has nothing to do with the problem!) and had nothing but problems. I was bending 1/4" steel, but was unable to get a full 90 degree bend because pressure would only go to 5-600psi and no more. This is a 2 stage pump that I have tested and it will deliver 3000 psi, so that isn't the problem. What will happen though, and this is the head scratcher, is if I deadhead the punch into the die it will build full pressure, but with a piece of steel in place to be bent, will only develop the pre-mentioned 5-600 psi. This was with a 2"wide opening die, so there is about 1" of vertical travel of the punch. So this made me think there is something amiss with a cylinder, scored or something. So I got the idea to raise the die up by placing a 2" thick spacer under the die, so I would be using a different area of the cylinders, but the same thing happens, if I deadhead it, it will go to 3000psi, but with the 1/4" steel in the die, will only go to 500 psi. I have a Parker elec/hyd control on it, hard to see how that could be contributing to the problem. I will add that I rebuilt the cylinders last winter with all new seals, and could find no scoring in any place on them. Under normal conditions, the cylinders are extended about 6" when using typical punch/die combinations, and they were extended about 4" when I experimented with raising the die.
Anyone have any suggestions?
Anyone have any suggestions?