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Pump problems.

A place to ask general spud cannon related questions.
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Pump problems.

Unread postAuthor: warhead052 » Tue Mar 20, 2012 1:37 pm

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.

Image

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

Image

And the wooden piston.

Image

Thanks for the help.
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Unread postAuthor: Lockednloaded » Tue Mar 20, 2012 1:55 pm

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
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Unread postAuthor: JDP12 » Tue Mar 20, 2012 2:03 pm

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.
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Unread postAuthor: Gun Freak » Tue Mar 20, 2012 2:42 pm

Make a pump head like my bolt/washer pistons.
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Unread postAuthor: wyz2285 » Tue Mar 20, 2012 2:46 pm

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.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: warhead052 » Tue Mar 20, 2012 3:47 pm

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.
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Unread postAuthor: wyz2285 » Tue Mar 20, 2012 5:43 pm

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.
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Unread postAuthor: warhead052 » Tue Mar 20, 2012 5:47 pm

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.
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Unread postAuthor: wyz2285 » Tue Mar 20, 2012 6:06 pm

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.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gun Freak » Tue Mar 20, 2012 6:16 pm

Warhead, send me some bank and I'll send you some parts :wink:
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Unread postAuthor: warhead052 » Tue Mar 20, 2012 6:35 pm

Check inbox Gun freak.
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Unread postAuthor: MrCrowley » Tue Mar 20, 2012 7:43 pm

Aren't you supposed to have a floating o-ring or some other design that lets air pass on the return stroke?
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Unread postAuthor: Gippeto » Tue Mar 20, 2012 7:49 pm

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! :lol:


This works rather well. :)

Image

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Unread postAuthor: warhead052 » Tue Mar 20, 2012 10:25 pm

Crowley, probably. :P 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.
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Unread postAuthor: MrCrowley » Tue Mar 20, 2012 11:41 pm

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).
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