Short question topic

[hectmarr]

[youtube][/youtube]

[farcticox1]

Does anyone know what this red knob is for?

That's what I used for the trigger

[youtube][/youtube]

[hectmarr]

A beautiful trigger and I unknowingly ...

[farcticox1]

Makes for an easy trigger

[hectmarr]

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.

[hectmarr]

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?

[jackssmirkingrevenge]

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.

[hectmarr]

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

[hectmarr]

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.

[jackssmirkingrevenge]

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

[hectmarr]

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.

[wyz2285]

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...

[farcticox1]

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

[wyz2285]

I know, but how does the inside looks like?

[jackssmirkingrevenge]

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.