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Thorondor (High Pressure Copper Pneumatic) - UPDATE 01/12/11

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: saefroch » Sat Mar 12, 2011 9:30 pm

That's kinda sadly low for a homemade pump...
If you rap your pump like I do you should be able to get 587 at least :D
But it's a lot better than what most floor pumps can manage!
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Unread postAuthor: jackssmirkingrevenge » Sun Mar 13, 2011 2:38 am

POLAND_SPUD wrote:ohh btw am I the only person who has noticed that D_Hall looks almost exactly like Peter from the Family guy ? :)


lol what?

He's a lot less portly, and lacks the testicular appendages for a chin :P

Image wrote:(Except my wimpy stature not capable of pumping the gun to 400 PSI.)


More serious than that is that you have 12 bore sabots and yet fired paintballs! We demand handfuls of nails/nuts/bolts etc! Against large sheet metal targets :D
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Unread postAuthor: mark.f » Sun Mar 13, 2011 3:06 am

Well I figured paintballs would be better at showing power against soft targets. Of course darts/steel projectiles will sail right through, but there's just something satisfying about blowing bits of your targets about 20' away and creating a fine mist of Budweiser that lingers like fog, all with a ~3.5g paintball, that can't be denied.

Also, to be honest I could get the gun to 400 PSI, but it would just take a ridiculous amount of time. Maybe I can incorporate both 400 PSI and better ammunition in the next video?
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Unread postAuthor: jackssmirkingrevenge » Sun Mar 13, 2011 4:27 am

mark.f wrote:Well I figured paintballs would be better at showing power against soft targets. Of course darts/steel projectiles will sail right through, but there's just something satisfying about blowing bits of your targets about 20' away and creating a fine mist of Budweiser that lingers like fog, all with a ~3.5g paintball, that can't be denied.


Fair enough :)

Also, to be honest I could get the gun to 400 PSI, but it would just take a ridiculous amount of time. Maybe I can incorporate both 400 PSI and better ammunition in the next video?


In this day and age shouldn't you be looking at fridge compressors?
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Unread postAuthor: mark.f » Sun Mar 13, 2011 11:05 am

I've been looking for one, actually. The search has been unsuccessful so far, though.
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Unread postAuthor: urgle the danish cow » Mon Mar 14, 2011 4:01 pm

great job. the past month i have been thinking of something very similiar so thank you
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Unread postAuthor: Zeus » Mon Mar 14, 2011 4:17 pm

In regards to your pump, just see my sig.

Very nice work, as you have 12 gauge (I think bore is correct, gauge sounds better though) wads, can I suggest firing shot against a launched target. (Slow clay pidgeon up close)
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Unread postAuthor: mark.f » Mon Mar 14, 2011 5:38 pm

urgle the danish cow wrote:great job. the past month i have been thinking of something very similiar so thank you


Thanks. Glad I could be of some technical assistance. :)

Zeus wrote:Very nice work, as you have 12 gauge (I think bore is correct, gauge sounds better though) wads, can I suggest firing shot against a launched target. (Slow clay pidgeon up close)


Better ammunition is definitely part of future testing. So far the most aggressive I've gotten with ammo were marbles and random zinc hardware.
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 14, 2011 10:46 pm

Zeus wrote:12 gauge (I think bore is correct, gauge sounds better though)


I think it's a British/American thing. I prefer bore, unless you mean 12 of these :D
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Unread postAuthor: Crna Legija » Tue Mar 15, 2011 3:42 am

id prefer 12 of them any day, imagen my cannon production rates then. :lol:
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Unread postAuthor: mark.f » Tue Mar 15, 2011 9:37 am

I question your tastes. :roll:
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Unread postAuthor: GUNSANDBURGERS » Wed Mar 16, 2011 10:53 am

tell me about the homemade pump... btw gun looks fantastic!
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Unread postAuthor: mark.f » Wed Mar 16, 2011 2:28 pm

Thanks!

It's 3/4" type L copper. The pump head (piston) is double o-ringed and seals 100% in the 3/4" tube. I could have eliminated a check valve in the construction by using a floating o-ring (like on the main valve's piston), but I went for simplicity and used two check valves in opposite orientations at the bottom for intake and discharge. Other than that, the pump shaft is 1/4" threaded rod which is used to construct the pump head and attach the handle, and the threaded rod is sleeved in 5/16" stainless tubing to reduce flexing and prevent any scarring of the pump body's ID from the threads. The piston is designed so that part of the nylon "plug" on the head and the nut on the bottom will hit the steel bushing at the bottom of the pump and prevent the o-rings from exiting the bottom of the 3/4" tube. Up top, I simply drilled a 5/16" hole in a 3/4" CPVC (same socket ID as copper fittings) cap which is simply electrical taped on to prevent the pump head from exiting the top of the 3/4" tube.

Any more questions ask. I could post some more pictures.
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Unread postAuthor: GUNSANDBURGERS » Thu Mar 17, 2011 9:51 pm

Thats exactly what i wanted to hear! Thanks! To clarify, Check Valves let the air in and out?
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Unread postAuthor: mark.f » Thu Mar 17, 2011 10:48 pm

Yes. The two at the base of the pump are in opposite orientations (with the intake angled up to prevent drawing in dirt/etc.). Probably should zip tie some foam around it but I haven't gotten to that yet.
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