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Mortar Idea

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: bigbob12345 » Wed Mar 05, 2008 8:28 pm

think of pvc piston valves they undergo more force than this setup will ever generate. And they dont cack if you use pressure rated parts.
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Unread postAuthor: Sergeant Dotson » Wed Mar 05, 2008 8:30 pm

I have made 1 simple guide hole. And also the nail is not puncturing any PVC. I don't know where you got that idea from.


P.S.
I got up a new pic.
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Unread postAuthor: OuchProgramme » Wed Mar 05, 2008 9:09 pm

bigbob12345 wrote:think of pvc piston valves they undergo more force than this setup will ever generate. And they dont cack if you use pressure rated parts.


Pistons under go PSI, not brute force. Here's a simple test....

Drop your airchamber while building your next gun.
Now pressurize it. Are you as confident w/ it as before?

Probably not. There's a weak spot where you dropped it, and when your pressurize the air chamber, it may just blow out on that spot.

Sergant: Sorry if my message came out weird. But when your pin strikes the end of the guide rail, it's going to smash into the pvc. After a couple of strikes, it's going to wear out and crack.
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Unread postAuthor: bigbob12345 » Wed Mar 05, 2008 9:13 pm

What I mean is when the piston slams back.
Any piston of reasonable weight will exsert more force than this spring when it slams back.
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Unread postAuthor: OuchProgramme » Wed Mar 05, 2008 9:15 pm

bigbob12345 wrote:What I mean is when the piston slams back.
Any piston of reasonable weight will exsert more force than this spring when it slams back.


Yes, but the piston force has a greater surface area to reduce damage at one spot. Much energy is put through one single pin in a guide rod, less surface area, many more pounds per sq inch.

Which one will be more effective?

A nail w/ 1,000 lbs/sq inch going through a plank of wood

Or a pvc piston w/ 1,000 lbs/sq inch going through the same plank of wood...
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Last edited by OuchProgramme on Wed Mar 05, 2008 9:18 pm, edited 1 time in total.

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Unread postAuthor: bigbob12345 » Wed Mar 05, 2008 9:18 pm

Hmm I see your point.
We will have to wait and see what happens when he trys it Im sticking with my original opinion.
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Unread postAuthor: OuchProgramme » Wed Mar 05, 2008 9:20 pm

I'm glad you see it :)
I'm not trying to change the way he builds, but just argueing for a point.
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Unread postAuthor: bigbob12345 » Wed Mar 05, 2008 9:30 pm

I do see your point but i still dont think it will be enough force to crack the pvc.
Any way if it cracks it will get replaced if it doesnt it will probably get replaced anyway so you get your way no matter what.
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Unread postAuthor: Sergeant Dotson » Wed Mar 05, 2008 10:02 pm

Well, I'm glad you two kids settled this argument. :hello1: Just kidding.

:laughing3:
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Unread postAuthor: bigbob12345 » Wed Mar 05, 2008 10:10 pm

Ha, you just made me laugh pretty hard
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Unread postAuthor: Jared Haehnel » Thu Mar 06, 2008 10:08 am

I'm pretty sure this is what you were talking about... but if it wasn't Ill put it out there any way.

If you use the piston to puncture the C02 canister. You drop the C02 down the tube and the piston propelled by a spring comes up and hits the back of the canister puncturing the seal. If the C02 is centered in the barrel and the piston's pin is centered you will get a consistent punch every time.


Its an idea and with out drawing it on paper I couldn't tell you how it would all work. But it would probably give you more constant results
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Unread postAuthor: bigbob12345 » Thu Mar 06, 2008 10:13 am

I just saw the new pic it is much clearer.
Well I am still going to say it all looks good I dont see anything wrong with it. Have you pulled the spring back and released it yet just to see if works?
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