Hey, very cool, nice prints! From my experience, you'll have trouble with the seal not sealing. I tried 3D printed piston seals and they don't seal. Somewhat surprised by that, I've been having quite good success with printing 95 TPU seals for old co2 guns. Maybe just lucky....which I'll gladly tak...

X2 Almost 200 posts and not a single useful one that I've seen. Maybe I'm just gettin old and cranky at this point lol. Your continuous and immensely annoying thread necromancy serves no purpose beyond increasing your post count, and making forum utterly unusable for anyone interested in actualy dis...

Impressive project and commitment to it. :) If you want to purchase a barrel, you might try Mike at Tj's. Mike makes a lot of the barrels used in big bore air rifles and has some more "air powered" specific rifling rates as well. These are hammer forged liners of very good quality. Mike can be reach...

Nice lathe.

Porta power gets my vote...oil is easier to clean up than grease. Testing a pcp reservoir.

Merry Christmas.

Could check with Aircraft Spruce and Specialty for tubing....overkill for the application, but available in a pretty wide variety of diameters and wall sizes and they'll do small quantities.

Ever considered ECM rifling? I believe the FGC-9 and it's ecm'd barrel have been shared here before; https://youtu.be/AyPJ2br5NFQ Smith and Wesson has been using ECM to rifle barrels for a while now....a quick look at the commercial version of the process; https://youtu.be/CylcaXYNzcg Looks a bit ov...

Nice work Jack.

As far as useful skills go, threading is right up there with grinding tools...opens options and doors to all kinds of new projects!

Al

Different strokes I guess. Moonbog; The theoretical fail point and "weakest link" are reasonably easy to calculate before construction. I do hydrotest "unique" assemblies, and in some cases will go beyond 5/3 MWP, but do not test to destruction, never saw the need on something where I am the one "us...

It was meant as something of a joke...I do not understand Romanian.

Good luck, play safe.

Al

Your English is MUCH better than my Romanian, so no worries...you express yourself just fine. There is not much to be gained by examining the welded ends, far too many variables. Are you familiar with F=P*A ? The weld holding your end plug is holding approximately 1719lbs of force (781Kg) at 1000Psi...

I realize that there may be some issues obtaining "preferred" materials in some countries. Can you show and give details of "how" you plugged each end of the tube?

Al

Mr Foo hit on the major point...the ends are where most failures occur first, and it can be pretty dramatic...even deadly. Wasn't too long ago that a fellow was working on a modified Benjamin Discovery and had the valve blow nearly through his thigh...barely missing the femoral artery. Another fello...

The former of course lol.

Was an enjoyable show in it's day..chock full of "manly manliness", "moar power" and tool girl hotness...Debby Dunning had it going on, Pam Anderson wasn't too bad either.

It IS kind of fun...playing with fire and molten metal is somewhat...primal. Would do a "Tim Taylor" quote here, but you're all likely too young to remember and grasp the humor lol.

Have been casting aluminum for a while now...very useful.