Very cool! interesting to see what performance will look like at high pressure. I never really took them beyond 850 psi, maybe a tiny caliber 4500 psi pengun would be an interesting project... Any way to loosen the barrel, or should I just get new bearings? I would just get the right sized bearings,...

Moonbogg wrote: ↑

Fri Jan 03, 2020 3:37 am

I love the blueprint looking design on top that follows the mouse cursor.

It does! woooow!

I wonder if PCGUY has upgraded embedded media...



HE HAS!

ALL GLORY TO PCGUY!!!

NeoSpud wrote: ↑

Fri Jan 17, 2020 3:03 am

"oh my god, I'm so old now"

Aren't we all! But hopefully, wiser, and in a better place financially...

Do you have a threading dial on your carriage? They save an awful lot of pissing about - without one, you need to stop the machine, reverse back to your starting position, feed in a bit, rerun your thread, lather rinse repeat until done, all without disengaging the carriage feed. This puts extra st...

PracticallySane wrote: ↑

Thu Dec 17, 2020 6:36 pm

What is the lowest mix i can achieve 3000psi post ignition?

I guessed your chamber dimensions and simulated it in HGDT with a "closed chamber":



I needed 27x before the chamber pressure exceeded 3000 psi

Oh in that case, perfectly normal when punching through steel fast enough

Came to see a Penguin That joke is literally as old as the first pen gun :roll: :D When I shot it, I saw orange sparks fly out, and it smelt like smoke... Is that normal?? Lol. Hmmm... from the pen itself? Or the target? Could it be that you had some lubricant in the barrel that ignited from the su...

Actually gave it a go and pretty happy with the result.

PracticallySane wrote: ↑

Sun Dec 20, 2020 1:25 pm

Its alot more fun with success.

Too right, glad you got it sorted!

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 ...

Here's to ending 2020 on good terms and hoping that 2021 will not get too much worse before it gets better, cheers!

This outbreak really is bringing people back online :D a lot of force needed to compress it though It would probably look like a ratchet mechanism on an ancient ballista. Doubtless an interesting project but on this scale pneumatics are so much more practical in terms of using off-the-shelf materials.

hectmarr wrote: ↑

Thu Dec 31, 2020 1:33 pm

I'm not going to say that connecting a few turns of conductive wire to the spark plug, and a small appropriate battery, is another option because you will fuck me!

Oh Hector

A not very interesting video I made is https://www.youtube.com/watch?v=mpwiL3BgiIY That was actually an amusing and informative watch, I can see why you thought my workshop was more organized... obviously you've just been at it longer J'ai aussi apprécié le contraste avec le bloke anglais pottering...

These hybrid-pneumatic circuits you manage to make work never cease to amaze me!