Alster370 wrote:Ahh why dont my pictures appear on the post
hectmarr wrote:You have to make many weapons, because this field is long and short life
That's a new oneTechnician1002 wrote:Naw
Did you epoxy all of the joints?I dont want to epoxy the barrel in until I know that the piston works.
I know. I wanted it to be mostly maintanance free, like a commercial gun would be but to do that I need a solid piston and well I dont have the right material or proper tools to do that at the moment. The gun itself will probably be in use for about 6 months before I decide to make another one so hopefully It would last. I could also do a piston of epoxy too, but that would be more expensive.Your design doesn't permit removal of the piston though
its not finished yet. and it seals well enough for my low pressure tests. my main focus has actually been getting the piston to operate properly first, then sealing the barrel for higher pressures, second.Why doesnt your piston have a sealing face?
yes it works pretty well. its airtight and its 4500psi epoxy too so strength is not an issue. I would solder but I dont have any flux or a propane torch to heat up the connections with.Did you epoxy all of the joints?
your piston is way to big you could 1/2 it
yes by about 1.5-2mmpiston a bit bigger than the barrel
The trouble is there is a little bevel 1/3 of the way in each side of the tee to stop the pipe from going all the way though the tee. I suppose I could sand it off if nessessary.the seat about 1/2way in the tee
Im using some white grease I got from a motorcylcle shop yesterday, seems to work fairly well.lube it up good
around 40-50 psi, I glue the barrel in with hot glue, then pump to 40 or so psi, release the pilot to see if the piston slams back or not. Do you think I should just epoxy it up and hope it works at high pressure?how low is your low pressure testing
Yes it will work fine if you attach it securely.can a piece of innertube be used as a suitable sealing head for the piston?
That is because your piston isn't airtight and your shock pump doesn't have enough air flow. You can fill it to the max of your floor pump then switch to your shocky and it will work then.Also my piston takes a while to move forward and seal the chamber, like 2-3 pumps on the floor pump and will not move when the shock pump is used.
That just created more pilot volume and allowed more acceleration room for the piston... you only harmed it by doing that.managed to slide the pipe going to the pilot further out from the piston tee so now The piston has more space.
European QEVs have been taken up to 800 psi I believe.I know that most are limited to 10bar, but I assume they can operate at higher pressures?
It was nessesary, because now the pipe is not in the the tee as much , so the piston can be the same diameter all the way across its length. When the pipe was fully in, a piston like that wouldnt have moved so it had to have the back at a smaller diameter to fit into the pipe so it could actually move. This is what I believe caused the sealing problems, as the new piston seems to be sealing much better. I hope that all made sense.That just created more pilot volume and allowed more acceleration room for the piston... you only harmed it by doing
that
Good to know that, I only intend to run at 350psi max, as I cant physically pump any higher with my shock pump. This is with the pump secured the the frame of the gun too.European QEVs have been taken up to 800 psi I believe.
