Search found 11 matches

by Sam@UoN
Tue Oct 20, 2009 9:58 am
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Yeah a 60J spring damper assy - will work a treat
by Sam@UoN
Tue Oct 20, 2009 4:19 am
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

here is a link to a part of a video that ive made http://www.youtube.com/watch?v=M8Hvz4h6Fek let me know if anyone can see anywhere for refinement I should also say that whilst they are not modelled the is an extension spring between the bolt and pison and an end cap on the left with a damper screwe...
by Sam@UoN
Sun Oct 18, 2009 5:12 am
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Will do a better job when i have more time tonight but here is a quick screen grab...
by Sam@UoN
Sat Oct 17, 2009 5:44 am
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

I should have the pro/e models done either tonight or tommorow - i've found a 2" high pressure PVC TEE that should do nicely and some 2" - 1.5" reducing bushes so that would leave a cavity where the 1.5" piston seals... Anyway I will post when they are ready - right now I'm being forced into bloody ...
by Sam@UoN
Thu Oct 15, 2009 5:51 pm
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Image

Like this? :shock:
by Sam@UoN
Thu Oct 15, 2009 4:45 pm
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Nah it's easy enough to do...just has to be tuned properly...i like the idea of non contact braking just because its funky tech but i think its massive overkill tbh For the piston im thinking some aluminium or titanium alloy or possibly structural plastic and this kind of shape...i can wrap the pist...
by Sam@UoN
Thu Oct 15, 2009 3:21 pm
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

I was thinking more along the lines of having the non barrel end of the piston housing effectively open to atmosphere and allowing the piston free travel down the housing as it opens until the gap is fully cleared, then having a spring - damper system to absorb the energy which would stop any kick b...
by Sam@UoN
Thu Oct 15, 2009 2:27 pm
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Make the QEVs? I would have no idea but i guess about £3-4 would cover the production cost @Tech - Great video, it answered just about all my questions. I think I will make a prototype valve myself in the style of the vid although I'm going to make it so the valve is normal to the barrel with the po...
by Sam@UoN
Thu Oct 15, 2009 12:13 pm
Forum: Ammo & Parts
Topic: Golf Ball Barrel FAQ
Replies: 33
Views: 26711

Nominal sizes came about to give you different groups of pipe, the actual values are based around the nominal diameter but vary to keep other aspects of the pipe (throughput/strength etc) either constant within the group or nice round numbers... That said, what they choose to keep constant mainly de...
by Sam@UoN
Thu Oct 15, 2009 11:54 am
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Firstly thanks guys for the quick and detailed response! I will post pics of the setup tomorrow when i get back to uni... Tackling things in order @inonickname - Agreed about not needing the pony bottle, but its there and tested so I'm gonna leave it in - Coaxial would def be the way to go but I hav...
by Sam@UoN
Thu Oct 15, 2009 7:43 am
Forum: Pneumatic Cannons
Topic: Project Golf Cannon
Replies: 23
Views: 1568

Project Golf Cannon

Hi guys, firstly congratulations on some truly terrifying contraptions, I'm consistently suprised by the quality of work some people can produce from their sheds! Right, I was hoping for some advice if anyone can see their way to helping me out... Let me give you the background. I am a mechanical en...