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Posted: Mon May 09, 2011 5:28 pm
by shardbearer
I just thought of this, it sticks better to the original QDV design:
Take 2 bushings (1 inch x 3 inch maybe?), and sand out the ridges. Over the bushings, put 3 inch couplers, then PVC pipe between them. Put the pipe which holds the piston straight through both bushings, then solvent weld her up. Voila!
Posted: Mon May 09, 2011 6:49 pm
by Technician1002
That is the way my ABS cannon is built. 2 inch barrel in 4 X 2 inch bushings in 4 inch couplers with 4 inch pipe in between. Ridge is sanded out on the bushings so the 2 inch pipe goes through them.
I assembled my cannon from the breech and moved forward. The rear bushing was installed on the pipe, a coupler added, then the chamber pipe. A 2nd 4 inch coupler was added and last the muzzle end bushing. This last bushing is the one that is not pushed all the way in as it became stuck in assembly.
This photo is the breech end showing the barrel, rear bushing, and rear coupling just prior to adding the 4 inch chamber.
Posted: Mon May 09, 2011 9:25 pm
by shardbearer
Doh.
Should have remembered that one.
Has anyone made a QDV in a tee? I think that might be my first pneumatic gun.
Posted: Mon May 09, 2011 11:59 pm
by jackssmirkingrevenge
shardbearer wrote:Has anyone made a QDV in a tee? I think that might be my first pneumatic gun.
Yes.
Posted: Tue May 10, 2011 1:46 am
by shardbearer
I meant with the chamber attached to the bottom of the tee like an over under.
Posted: Tue May 10, 2011 1:51 am
by qwerty
Biopyro has made one but i think he only posted it on UKSGC which has been closed down finally...
Posted: Tue May 10, 2011 6:13 am
by jackssmirkingrevenge
shardbearer wrote:I meant with the chamber attached to the bottom of the tee like an over under.
That should work just as well.
Posted: Sat May 14, 2011 3:18 pm
by Gun Freak
Posted: Sat May 14, 2011 8:00 pm
by shardbearer
Not a true QDV because the piston cannot move on the rod.
A nice cannon, but it doesnt help me much cause that is small diameter brass/copper (I cant tell which) tee, and I am thinking of basing mine around a 2" PVC tee.
Posted: Thu May 19, 2011 9:17 pm
by Gun Freak
shardbearer wrote:Not a true QDV because the piston cannot move on the rod.
Who says a QDV's piston has to be able to slide freely?
A nice cannon, but it doesnt help me much cause that is small diameter brass/copper (I cant tell which) tee, and I am thinking of basing mine around a 2" PVC tee.
So scale it up in plastic, lol. I gave you the link to give you an idea, not a blueprint to copy off of.