Homemade QEV

[andrew67]

Just tested it! I pull the trigger on the blow gun the air vents out the blow gun so I guess the piston isn't releasing off the barrel! Is it possible the piston isn't long enough not going deep enough in the chamber behind it?

[jrrdw]

Take the chamber off and reach through the bottom of the tee and move the piston by hand, see what's happening that way.

[Labtecpower]

If you're filling the gun from the pilot area, you don't even need a spring

If the piston doesn't move back the piston probably isn't tight enough. Clean it very well, and give it a tight wrap of cellophane tape until it fits snug in the housing.

[andrew67]

Movement is fine,I can put a rod down the barrel and push the piston that way,it moves freely but if your saying/labtecpower to wrap the piston to seal it better that means mine isn't long enough because it doesn't seal at all,so I guess it should fit like a coaxial piston would with same concept! I think I'm understanding it better now!you build it the same as you would a coax!

[andrew67]

First test the QEV released all it's air out the pilot valve so I've made a new longer piston,it works fine now,but the whole setup seems to waste a lot of air or it's the blow gun wasting it!hopefully with some tuning it'll be better for multi shots!

[jackssmirkingrevenge]

It seems your piston isn't tight enough...

[andrew67]

I don't think I could get it any tighter!but I'll try a new one!see how it goes!

[jackssmirkingrevenge]

typically if all the air is going out through the pilot, too much air can get past the piston.

[andrew67]

Ok,no worries I'm understanding better as I go with your help!i think I was a bit miss guided at the beginning! Thankyou!or I missunderstood a tutorial