SpudFiles

This is my shock pump it is similar to Btbs style pump but with a modification just ask questions if you don't understand somthing.

looks nice....... hows that piston head holding up for ya? its simpler than the epoxy style...... Me likey........

I would say it holds up just like any other pump head really.

How well does this piston work?

This just goes to show you how easily a piston can be made.

Nice job, makes me want to build my own.

If you could go into how you made the piston head that would be great...

im constructing one of theese over the summer for my .40 cal dartgun and yours is the simplest ive seen yet.

That's what I go for ease of construction instead of moderately complicated as hell For the end of the pump I used 3 5/16'' nuts
one brass washer that fits the 1/2'' pipe I had to drill the middle a little larger and a o-ring that fits the 1/2'' pipe

The washer is epoxied onto one of the 5/16'' nuts then that is epoxied to the 5/16'' threaded rod and other nuts and o-ring go as shown

EDIT: if you atemt to use this pump head design and you use 1/2'' pipe you need to use the thinner wall diameter pipe if you can tell me what type it is I think it is type m that would be great.

You could even use a .5 inch locknut to negate the need for epoxy.....

is the washer free-floating? or attached to the nut airtightly (NEOLOGISM!)

and the type of copper is type M copper, its "low pressure" copper even though its rated to nearly 400 PSI..........

Thanks VH-man and yes the o-ring is free floating but the washer is glued to the 5/16'' nut above the o-ring what is neologism?

its a made-up word... lol sorry i didnt point that out before.

thank you, im proboably going to construt one of these this weekend.................. that is if Crew gives me my weekend free.

I need to tell you that the modification I made was I put a endcap with a hole drilled in it on the end of the piece of pipe that goes into the 3/4''x1/2''x1/2'' tee this allows the pump to reach higher pressures without the end of the pipe cutting into the sealling face on the piston in the check valve I needed to tell you that before you make the pump.

Im planning on using a commercialy availiable check valve, but thanks for the heads up!

What did you use to screw the pump onto the schrader? did you just take one off a regular pump head?
Nice pump btw, i plan on making one soon

FordGtMan, I have a better way to connect homemade pumps....

if possible, replace your Schraders with Quick Disconnect fittings. that way, you can plumb a Quick-disconnect into your pump and not have to worry about things like leaking or the fill popping off.

however, im pretty sure if you wanted to stick with schraders you could take one of the thread things off the end of one of the CO2 Inflators

What I did was use 1/4'' id braided pipe and a hose clamp you clamp the hose onto the shrader it works great! It never poped off.

With ½" pipe you wont get a whole lot of flow, so you might want to cut a bit down on that pressurehose if its possible, or maybe sleeve it on the inside with some smaller diameter hosing to decrease volume. Believe me, it will save you some sweat