Thanks for the information, assuming what I have drawn is correct however does give it a downfall. On the old design it would snap open much quicker and also the magazine was completely sealed off before it shot, this way it is not delayed therefore air would be lost.

I have now revised my old design into a simpler one. The chamber is no long a jacket' to the valve which allows the balanced piston to be shortened reducing dead space, the piston was also thickened to increase weight (Hopefully slower fire rate) and decrease dead space. The Barrel is also part of t...

Hey man, would something like this not be easier? The large piston would be better off being almost balanced at first so it allows the front area to get to a reasonable pressure before compressing it but its an old drawing and I can't be bothered to edit it for now... Of course you would still need ...

This can be done MUCH more efficiently but the same theory applies. Was checking my laptop and found this pic from a while ago and though I would upload it. The bolt needs revising to be effective and it might work better with a moving barrel to be honest... http://i.imgur.com/PXWZcHQ.png EDIT: Revi...

omg thats so nice how do you do such a nice bevel on the blade!?

I don't know how im going to heat treat it... I guess a blow torch to get it to heat,. ITs not super thick.

Would also like to state that this was done by a hand file completely... My friend wanted his dremel back after i told him i was getting high carbon steel to make a knife... He said it would knacker the dremel xD. I did about an hour or less a week!

Finally shaped a blade after about 8 months after i got some steel from jake xD

Nice video bud thanks for the upload!

I belive that is a loom, did you mean this?

Whoo sexy!

Do you also mill jack?

Ok thanks for the help!

Cool, either of you guys in Europe or better england?

can people here machines steel? Sorry if its an obvius questions but im not too clued in, in machining

I don't get the physics here. If you have 2 bar in an incompressible tube, why should this pressure reduce as you go deeper? Thinking about it your quite right... I think i would have to have a piston. EDIT: Boom http://www.instructables.com/id/Diving-Depth-Gauge/ Read your full post and you alread...