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Squeak's Second(and first practical) Gun
Posted: Wed Dec 20, 2006 6:55 pm
by squeaks
Ok, so here it is. It has a 4'10"x3" chamber and a 4'10"x2" barrel. The valve is a 2" porting barrel sealing piston. It has 2 o-rings to increase performance. The sealing face is 2 layers of truck tire tubes held on by a nice big washer and screw. It seals against a 2" coupler cut in half and the stop sanded out(so it would have a nice square sealing face). It's piloted by a 1" ball valve and has a quick connect and 1/4" ball vavle for filling.
Oh, yeah, I forgot to mention that I removed the stop from the tee and sleeved it with 3" pipe so the piston and o-rings have a nice smooth travel the whole way.
Posted: Wed Dec 20, 2006 7:16 pm
by Bluetooth
Thats very very cool! I just made a gun almost exactly like it but i don't think I'll get around to posting it very soon
.
Posted: Wed Dec 20, 2006 7:16 pm
by Insomniac
Nice! I like it, but isn't that piston a bit heavy? you should drill some holes in the back to hollow it out a bit.
Posted: Wed Dec 20, 2006 7:17 pm
by squeaks
Actually the piston is surprisingly light. It's not a hard wood so it's not that bad.
Posted: Wed Dec 20, 2006 7:17 pm
by Bluetooth
It's just wood. Some people use solid pvc rod for pistons. One of them is on advance spuds.
Posted: Wed Dec 20, 2006 7:48 pm
by MrCrowley
nice gun, but by making the seat diameter bigger wont the piston be slower as the sealing face diameter isn'that much bigger then the seat diameter.
Posted: Wed Dec 20, 2006 7:56 pm
by experament_u2
awsome gun nice and clean
Posted: Wed Dec 20, 2006 7:58 pm
by squeaks
Ok, since the seat is rather large there is less air pushing back on the piston. This makes it take much longer for the piston to move when your firing. Once the piston starts to move there is suddenly a large area that the air is pushing against and since most of the air is vented there is little resistance for the pistons movement. By increasing the seat it actually makes it work faster, wahahahahahaha!!!!!
Posted: Wed Dec 20, 2006 8:19 pm
by MrCrowley
if you say so,but then you would think they would be even as a small seat piston would start going back before the larger seat piston and then that piston catches up in speed......oh who gives a crap,its only a few miliseconds difference.
Posted: Wed Dec 20, 2006 8:25 pm
by squeaks
exactly. Same reason why there really is almost no difference in performance between a chamber sealing and barrel sealing piston. The big reason why chamber sealing ones usually work really well is that they must have o-rings, which also increases performance dramatically. Without the o-rings I can't actuate my piston with a 1/4 ball valve, yet Gort's mauler's easily actuate with that size of valve. Hooray for o-rings.
Posted: Wed Dec 20, 2006 10:32 pm
by MisterSteve124
Nice job! Especially on the piston. It looks great for your first one.
Posted: Wed Dec 20, 2006 10:54 pm
by squeaks
Funny story behind that piston. We got my physics teacher to turn a 4x4 down on a lathe, then we made one o-ring groove with a table saw at my neighbors house, got tired of making 'em that way(and ruining 2 previous pistons made of pvc) and made the second groove on the lathe. Ironically the table saw groove is the better of the two.
Posted: Thu Dec 21, 2006 5:57 am
by mark.f
Looks good. Is the wood holding up well?
Posted: Thu Dec 21, 2006 7:47 pm
by squeaks
Wood holds up great. Plus the caulk pad takes most of the impact.