SpudFiles

I am having a problem with my pump head sealing and compressing the air. I dunno why its not working, because the O-rings are a nice fit, and I can move the pump up and down. I am just plugging one side with my thumb for now until I can get it to compress, but its not doing that. I made two different heads, one is a wooden piston, another is a CPVC piston. I will attach some pictures, and if you can help please comment.

View of the wooden piston fitting into the cylinder.



CPVC piston. The O-rings aren't actually that bad, just the angle I took the picture...



And the wooden piston.



Thanks for the help.

Wood isn't exactly the best component for something you want to hold air. It's pretty obvious that any air you may be compressing coming straight through your pump head

ditto on the above.. wood is not a good idea. also... even if it is the angle of the picture.. despite that.. your o-rings look extremely jank. The one surrounded by JBWeld looks very cracked and dried out.. I'd replace it.

Make a pump head like my bolt/washer pistons.

Gun Freak wrote:Make a pump head like my bolt/washer pistons.

I agree, did that with my homemade HP pump, worked really well(1000 psi!)
Just remember to epoxy the washers/bolts or the air will leak from there.

Gun Freak, I would if lowes or home depot carried washers to fit this!

JDP, Locked, the oring really isn't dried out. I swear. I have seen wood used before as a piston too, I will try and find the thread for it.

Oh come on, are you one of these guy who only knows to buy? There isn't many already made - functional parts to buy. My washers did fit, so I put them on a screw and tied them with bolts, then put the screw on a drill and start file/sand until they fit.

No, how do you think I made the wooden piston? I need to find washers that fit the rod without being far too small, or wayyyy too big.

Dremel with a metal cutting blade is also great for standing, or you can cut the washer to a semi circle with the diameter close to the tube, then sand it to a perfect circle.

Warhead, send me some bank and I'll send you some parts

Check inbox Gun freak.

Aren't you supposed to have a floating o-ring or some other design that lets air pass on the return stroke?

MrCrowley wrote:Aren't you supposed to have a floating o-ring or some other design that lets air pass on the return stroke?

Ya know....that just might work!


This works rather well.

Crowley, probably. I know, but I did it with a cpvc tube and a non attached oring and it compressed air. So I don't understand why this isn't work.

Well without a floating o-ring, or a design like Gippeto's, it will compress air but it wont draw in any new air when you pull the pump up; you will just create a small vacuum and when you push the pump down again nothing will happen (no air will be compressed).