Thanks for the point and the compliment. Actually, I was trying for redneck rather than steampunk. Although I wasn't ready to finish the wood with duct tape. Epoxy implies a certain permanence, and to be sure, this version is not permanent. I have already started on v2.1 and had to finish this v2 to...

Thanks for the point. Mind sharing the QEV link? Whats the max psi that it could stand? Thanks Here is the direct link: "http://www.grainger.com/product/AIGNEP-USA-Exhaust-Valve-5UPH4" (intentionally made not hot). From the description on the web page: Item # 5UPH4 Mfr. Model # 82650-08 Catalog Page...

Thanks for the point.
That is steampunk,
Mine is steampunk.

ETA: And thanks to Tempest for an additional point as well.

Here is my latest pneumatic. I have been working on this gumball shooter for the better part of this year trying to create a mechanism which: 1- will shoot 36 gr/.625" gumballs. 2- use hardware store parts as much as possible. 3- be cheap to make. 4- the diy parts are easy to make. 5- use no epoxy. ...

That is quite impressive. What pressure are you using and which model Cold Steel blow gun? I will have to look into this some more. One of the annoying things about using plumbing materials for parts is the crazy variation in the dimensions. Although the copper tubing is a lot better than pipe, I ha...

Ha.
You made me go back and check my spelling.

That is some really nice machine work there. I read through your three projects re the penguns. I'm afraid my patience places me a lot closer to the mixing epoxy method rather than machining parts. I remember that you posted about self contained cartridges recently. I was thinking that my next proje...

Spudinator said: Thanks for the thoughtful comments and offer to assist. There is no question that I know very little about the right way to operate the lathe. A machinist would probably have a heart attack if he watched me one day. A couple of knowledgeable friends have guided me in several areas,...

Does GGDT send you secret messages about what guys are modeling? Just kidding. Your post is interesting because I made a new barrel last night of 5/8 bore pvc lining 3/4 copper 17" long. Then came in and started modeling changing the chamber size vs velocity gain %. I settled on a 6" length of 1" ri...

Yeah, sometimes the parts dictate the layout.

BTW, love that chamber to barrel ratio.
What is that silver cylinder between the chamber and the QEV?

Thanks for the comment Spudinator. I wish I was better at lathing stuff. I don't use it to anywhere near it's potential. A slight deviation from the more elaborate build, I had an idea that needed checking out. The first pic shows the new pistol length barrel made from 1/2" brass nipples sleeved in ...

And suddenly it all makes sense. Thanks JSR. Reading the posts over the past few months, I have come to be able to follow the explanations, but with that illustration, now I understand the science. It's so simple. You could look at that as a lopsided coaxial as well. The reason went with manufacture...

No question about it. That one piece of software is a gem. And something of an enabler. Here is a pic of the start of my next build. It will be a 1/2" barrel forward opening breech loader. I fully expect someone to point out a dozen or so similar builds, and won't be upset at that. I'm always open t...

No holes in the garage door yet. But I guess there are two kinds of spudders: Those who have and those who will... I hate shooting the gumball gun indoors. They explode and make a mess. They sure do clip along though. I am converting over to a breech loader made of metal. More pressure and more powe...

jsr: Thanks for the compliment. Well, I did consider putting a 1/4" lag screw through the primer hole from the inside... I guess I am still in the "wow I'm still impressed it does anything" stage. When I fired the first shell through the 24" barrel and it gouged the plywood backer and ricocheted all...