#1
Posted 21 January 2009 - 08:18 PM
Coming out the back of my shotty is a cutdown magstrike pump with improved seal and schrader valve. One might ask why the need of the improved seal. The answer is that the air spring is primed at about 20 psi and when fully compressed can reach close to 80psi which would blow out the flimsy o-ring that came with the pump.
As you can see the spring works by pushing against the shotty plunger rod.
Unfourtunately this design failed because:
1)The friction between the pump head and the pump tube was so great that at lower pressures(the only time I could prime the gun)the spring would stop halfway
2)The spring was not easily recreated
#2
Posted 21 January 2009 - 08:28 PM
#3
Posted 21 January 2009 - 08:30 PM
Edited by veginator, 21 January 2009 - 08:31 PM.
#4
Posted 21 January 2009 - 08:33 PM
#5
Posted 21 January 2009 - 08:37 PM
#6
Posted 21 January 2009 - 08:46 PM
Edited by Lt. Stefan, 21 January 2009 - 08:46 PM.
#7
Posted 21 January 2009 - 08:49 PM
If I could make another one with less friction it would accelerate at close to the same speed as the spring.If your going to use the springs with it also, it will probably accelerate slower than the springs, rendering it useless.
#8
Posted 21 January 2009 - 10:27 PM
Edit: I'll try this next part again.
Also, it may not entirely be the fault of the friction (you did lube it though right?), but the fluid dynamics from the air cylinder.
The gun needs to build up pressure behind the dart, and the pressure will equalize in each chamber. It would be a hard exact equilibrium to find without calculus, since the dart may or may not be accelerated, thereby increasing the volume, among other factors. Basically though, 1ci at 80 psi, and then the whole volume of the gun's plunger tube at atmospheric pressure will equalize somewhere above what I suspect your pre-primed, pressurized air column is at. This would slow the moving pump shaft if the dart has not left the barrel yet. If it has, then this is irrelevant. Just something to keep in mind when working on it though. You'd want a looser dart fit and a barrel too short if anything, just like an air gun.
Very creative idea though.
An air tank on this principal would be pretty cool I think. A couple of pumps that would be a lot easier to do (than taking a normal tank up to 80psi), to get a column up to 20psi, then reducing the container volume to get a greater pressure. Would be an interesting experiment to see how volume and pressure change how the gun works (as in, titan tank at low pressure <?> range than a 2k at a higher pressure).
Edited by Splitlip, 22 January 2009 - 02:47 PM.
#9
Posted 22 January 2009 - 12:11 AM
(Unofficial) Wii thread
Damn it Foamfoot. Why is it that you kill every good topic with a retarded response a few days late.
#10
Posted 22 January 2009 - 06:50 AM
Thank you foamfoot but the pogo stick is about 10 times bigger.
#11
Posted 22 January 2009 - 07:16 AM
#12
Posted 22 January 2009 - 05:51 PM
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