SpudFiles

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hectmarr wrote:Does anyone know what this red knob is for?

That's what I used for the trigger
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A beautiful trigger and I unknowingly ...

Makes for an easy trigger

farcticox1 wrote:Makes for an easy trigger

I was improvising this little semiautomatic thing to shoot 6mm plastic balls, I work a couple of hours. That's why it was the question. I operated the shot with the solenoid, but now that I know what the orange button is for, I shot from there, as you explain.

What standard should a steel tube with an inner diameter and about 1.5 mm - 2 mm in wall thickness, manufactured for high pressure?
Can it be ASTM 312 SCH 5S?
I mean what kind of steel tube do you use?

Are you trying to calculate the burst pressure?

This is a good calculator to use, of course you need to know the grade of steel used but you can at least make an approximate determination.

jackssmirkingrevenge wrote:Are you trying to calculate the burst pressure?

This is a good calculator to use, of course you need to know the grade of steel used but you can at least make an approximate determination.

Yes, just that. I have to buy a steel tube to build some more pressure. The calculator is very useful. Thanks Jack

I found this table ... It seemed useful to me and that is why I leave it to everyone's consideration. I put colors to those that interest me, only this.

The obligatory question is what kind of mix numbers will you be burning?

In my case, low level of mixing pressure, how much 10X, although I have projected 8X for the new camera that I will build. It would be about 1100 psi, 80 bar, as pressure peak approximately, surely less, It would be within the working pressure that tolerates a seamless tube sch 5 of 3/4 "and 1.6 mm of wall.The sch 40 tolerates much more, and is easier to get from these sides
The problem is that the tubes I am using have a thickness of 0.8 mm and have laminated and polished seam ... I feel uncomfortable when passing 6X, and it would be a serious flaw with the weapon so close to my face. It's not worth risking.

Anybody knows how a gas ram/ spring works? I tried to make a gas ram powered bolt action but no matter what I do it leaks over time, I made sure the surfaces are smooth, free float and right size o-ring (two of them even!) and it just leaks...

A bit like a gas ram that holds up a car tail gate.

I know, but how does the inside looks like?

farcticox1 wrote:A bit like a gas ram that holds up a car tail gate.

That's more or less what it is, here is the relevant patent.

Personally, I think such devices are of limited relevance to the average spudder because of the need to retain large amounts of stored mechanical energy on a single point, in a manner similar to a crossbow. It can be done, but it's easier and more practical to store that energy as pressurized gas that is released by a valve. If you look at commercial airguns, there is a fairly low upper limit that such configurations can achieve in terms of energy in the 30 ft lbs range, while precharged pneumatics can be an order of magnitude more powerful.