Nothing wrong with low tech at all. The only real problem with digital caliper DROs apart from the small readout (and that can be taken remote with a bit of work and an arduino) is refresh time; rather than emitting a quadrature signal in real time there's a sample output every x milliseconds, which...

Sweet! So... do you just butt it up to the ways to make sure it's parallel? Slap it on, eyeball it straight to the ways and get after it. If you look across one straight item at another, it's fairly easy to see relatively minor angles of "off kilter"....and I'm under no pretense that I'm holding +/...

Hi everyone! I've been reading this forum long time now and I have built few hybrids aswell. Recently I have cranked up my mixes and I started to think about that if I have chamber, lets say 30ml and I go for X20 mix with MAPP gas with 4,66% mixture. So equation is then 0,0466 X (30ml + 1,5ml) = 1,4...

Imgur album below https://imgur.com/a/sEVcgje I picked up this fun .177 rifle last year. A handy little lever action and a decent plinker, but I actually primarily wanted it for the mechanism which imitates the real gun with shells that chamber and eject with a wonderful metallic ratcheting. I spend...

Howdy Gents! Don't remember the last time I signed into the files and made a post. Honestly, I'm surprised I even remembered my pword :lol: Interested to see who all is still active on here from the old days! @PCGuy I like what you've done with the place! Anywho, I want to drop a quick thanks to eve...

I bet a motorcycle or automotive shock absorber could be turned into a wicked spring rifle... might be on the dangerous side tho! Inspired by seeing one in the dumpster the other day.

Some friends talked me into chipping in on a horrible pontoon boat from Craigslist, so I figured it needed a cannon. 4.jpg Youtube vid of building and testing it: https://youtu.be/y364uvJSq-U I still need to swap out the air hookup for a self-shutting version, otherwise I've just been keeping it hoo...

I just finished building a wheeled potato "howitzer" out of spare parts. It works pretty well, although I need to take it somewhere a bit more rural for testing once it's legit to travel around again. 1.jpg 2.jpg Youtube vid: https://youtu.be/ocxYe_j6nOw It's got the standard 2" barrel & 4" chamber ...

Nice! I'm very impressed by all the "errata" like the homemade scrap elevation adjustment and frame. I can tell a lot of persistence was required to get all of that to fit together, good job! Few suggestions: 1.) As far as the recoil springs, they probably won't do much with light projectiles like l...

Its been a good ten years since I've actually been active here, and it's good to see some of the old folk still around. I'm happy to see that things are running smoothly thanks to PCGUY's continued oversight! Ashamed to say that I haven't had much time to get out and build much lately, the last coup...

drac wrote: ↑

Mon Apr 13, 2020 1:37 am

my ex-wife decided to sell them on me.

I think JSR just had an aneurysm.

Machine tools might possibly be valid reasons for divorce.

Selling my machine tools after a divorce would be a valid reason for "disappearance"

Made a gun of 40 mm caliber, used a piston valve. The gun works well at pressures up to 20 atm, no longer possible, because the rubber on the piston is torn.
[youtube][/youtube]
here is an approximate diagram of the valve. Used a coarse water filter.

A few days ago, I managed to make and test a piston valve with a caliber of 40 mm. I managed to make an exit into the barrel with a diameter of 14 mm. I pumped 50 atm into a cannon with a homemade pump.

PCP with more than 4000J, 265 bar, and projectile of 0.168 kg ... Beautiful!