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by mrfoo
Fri Aug 28, 2020 11:28 am
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Re: Full auto airsoft pistol

Video or it didn't happen :)
by PCGUY
Mon Sep 14, 2020 2:36 pm
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Re: pages won't open

Alright guys, at a new host - still sorting a few small things out for transitioning server/settings/etc but our white pages seemed to have immediately disappeared!
by D_Hall
Sun Nov 08, 2020 3:58 pm
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Re: PVC Primer/Glue says DO NOT TEST WITH AIR

I looked at the GGDT program and it doesn't appear to have an option to calculate the maximum range in which it will be able to fire which is in my opinion the whole point of the software.. The point of the program is to have an idea of what your muzzle velocity will be. As for maximum range, that ...
by PracticallySane
Tue Nov 24, 2020 7:37 pm
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I'm back!

Hey guys, its been a very long time. I previously used the name "*###*" I lost access to my account and it seems I'm sol as far as recovery is concerned. I have built many more great toys over the years and I felt like getting back into the community to share my knowledge as well as to learn and bec...
by SloppyJoeES
Wed Dec 16, 2020 7:00 pm
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My first working pengun- ammo questions...

I have finally completed a simple coaxial pengun, yet another copy of a copy of JSR's design from so long ago. I'm very happy with it! 20201216_154331_HDR.jpg The build is made up of two 1/8" brass pipe nipples coupled together, with an OD 7mm ID 6mm stainless tube epoxied inside. Inside of that tub...
by Gippeto
Mon Dec 28, 2020 10:27 pm
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Re: stainless steel tube burst pressure

Mr Foo hit on the major point...the ends are where most failures occur first, and it can be pretty dramatic...even deadly. Wasn't too long ago that a fellow was working on a modified Benjamin Discovery and had the valve blow nearly through his thigh...barely missing the femoral artery. Another fello...
by jackssmirkingrevenge
Thu Dec 31, 2020 10:26 am
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Re: stainless steel tube burst pressure

I follow his same philosophy, and up to now I have my two eyes and my ten fingers. :D I didn't used to, but I have had a few close shaves, and each time you realize how lucky you were and do things differently next time. Apart from being sure of your pressurized fittings, one thing that applies to ...
by Exclaim4
Fri Jan 01, 2021 12:07 pm
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metal pipe gun

https://www.youtube.com/watch?v=UC6DPhBtdmU The bullets are 15 millimeter fishing sinkers covered in duct tape. The tape makes the pressure build up when the bullet tries to enter the barrel which makes the bullet violently pop out. The barrel is a 15 millimeter stainless steel pipe. The loading cha...
by headslammer
Tue Jan 26, 2021 4:23 pm
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The Yeet Machine

Hey everyone! Been lurking here for a while after discovering this place while doing research on a pneumatic cannon, finding solutions to problems, etc. Now that it's been designed, built, and tested a few times I figured I should post here. I'm going to break this down into parts/chapters to make i...
by squib
Thu Jan 28, 2021 10:54 pm
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Re: New spring powered airsoft

That's beautiful man. That's the kind of project where if you just have to enjoy the fabrication process itself. The shooting is the icing on the cake :) Nice work!
by hectmarr
Fri Feb 26, 2021 7:20 pm
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Re: Simple machine gun.

This is the electromechanical system, which among several other things also makes this machine gun work. The servo motor is modified to rotate in one direction freely, I only use the motor and reduction gears. The potentiometer and board with electronic components were removed because they are not n...
by hectmarr
Wed Mar 03, 2021 10:41 am
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Re: Simple machine gun.

I am going to make a video with a firing rate of no more than 6 per second. I prefer not much speed because everything is clearer to my eyes and ears. I have also tested a speed twice what I use in video, but only for testing. As I was saying, I prefer a firing rate of about 8 to 10 per second, whic...
by Moonbogg
Thu Apr 01, 2021 10:25 am
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Re: Pressure rating for Coaxial cannons

See link with external pressure ratings for PVC. They call it "critical collapse" pressure ratings. You can compare the critical collapse rating with the internal pressure rating. Critical collapse ratings: https://www.usplastic.com/knowledgebase/article.aspx?contentkey=777 Compare those figures to ...
by Moonbogg
Sun Apr 04, 2021 6:44 pm
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Re: Pressure rating for Coaxial cannons

What do you mean by buying an air tank and punching holes through it? Making a PVC cannon this large makes me especially uncomfortable.