In an earlier post I was trying to find a manual for a Polar 55 paper guillotine which had hydraulic problems. I never found a manual but found some info and dismantled the hydraulic valve block where I found the broken housing which has the valve stem running through it.

As a new part is unobtainable I was going to machine one. The valve spindle is 8mm dia and its about 28mm on the largest dia.

The existing material can just be filed and produces sharp sparks looking like carbon steel. I was hoping to avoid heat treatment.

The nearest material I can obtain is 24T, has anyone a better suggestion for material?

Peter

Thanks for the material suggestions, very helpful. I've managed to get hold of a small piece of EN19 and made one. I changed the design slightly to made radiused corners where the original broke at the sharp edges. Its now installed in the hydraulic block inside the machine and so far its now working and giving an adjustable pressure to the clamp (20-120bar) so I'm pleased with the progress. So pleased I forgot to take a pic!

Not sure if its going to hold also I'd like to make another better one just in case so I'd like to take up the offer of the P20, what the best way to arrange?

Peter

Thanks David, just sent pm.