what to do with a free scrap dumpster find ?

Maybe I'm lucky as I get custom brake lines made by my local specialist hose shop and they have never let me down. He carries 4mm fittings.

CPVC piping which is suitable for hot and cold water distribution has a 400 psi pressure rating at room temperature, and a 100 psi pressure rating at 180°F.
It is cheap and will actually increase your storage by going to a 1" or larger header. Air hose is always a bottleneck.

i was thinking maybe a bigger diameter hard line to the machine might be something to think about but never thought of using plastic, the 50ft hose is probably why i am seeing the 10psi pressure drop from the compressor to the machine.

i will have to look and see what size the outlet is on the compressor tank? i think it's a 1/2 NPT but it's been good to me the last 25 years and held up to some heavy use. it has a 60 gallon tank and is 6.5 HP so keeping up is not the issue. more on supply lines like your thinking. it needs some TLC on that end for sure.

Most of the hose is 3/8 and 50 feet is a lot of drop.
The light PVC will normally work, but I don't like to push it. It is a lot easier than black iron.

machinedude wrote:

good news is my power draw bar works. but i can only get 90 psi at he machine so my force is not as high as i want as a result of this. i have 100psi at the compressor but by the time it gets over to the machine i can not get over 90psi. the long hose might have something to do with the drop taking a guess? 

No. Not at zero flow (ie, with a cylinder that is not moving). It's more likely that one or both gauges are not to be trusted.

I had a similar problem and fixed it with a tandem cylinder (two pistons on one rod) 

i know they make air cylinders like this and have more force as a result. i actually watched that video before

if i can get mine up to 110psi it should be able to completely compress my Die spring. the total force is slightly over 1,300lbs for this. i had the draw bar set to about 900lbs and it would start the ejection @90psi but stall before it completed. @90 psi. the force is close to 1,100lbs so it seemed like the 90 psi at the machine was as to be expected at he drawbar. my air cylinder has a 100mm bore diameter so it should have the force needed as is once the pressure issue is sorted out.

everything on the compressor is close to 30 years old so maybe that regulator is off? i did find a leak from the pump to the tank that i fixed that must have worked loose over time? never heard it leaking there but never paid much attention either until now the regulator was second hand at the time 30 years ago as well. so that's probably the first place to look.