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stuck by stefan

Member Since 04 Oct 2008
Offline Last Active Jul 21 2019 06:10 AM

Posts I've Made

In Topic: I finally made the sex pistol work | I'm drunk | does anyone still

20 July 2019 - 03:45 AM


In Topic: Upgraded Air Cannon Design - W.W.A.C. 2.0

14 March 2018 - 11:47 AM

Do yourself a favor and start learning how to design with CAD. Programs like Fusion 360 are free and are immensely capable. It's like an unlimited sandbox where you can build and troubleshoot digitally in hours what would usually take weeks of trial and error in the real world.

Also, I don't know if Fusion 360 has this, but in the program I use (SolidWorks) There's a very detailed simulation system that would allow you to input the material you are using along with your planned pressure, and it will be able to tell you if the system is safe of not. 

Also: I'm not sure if you're using PVC for the air tank, or how high the pressure is, but I would be sure to cover everything that is pressurized with Kevlar reinforced tape so that in the unlikely event that is does explode, you won't get shrapnel in your face.

In Topic: [WIP / Design] Chimera

14 March 2018 - 10:41 AM

You don't really have to start from a blank sheet if all you want is a shortened Caliburn. You can just trade available plunger stroke for spring compression (and as a result slightly less deadspace). You can also shorten the ramrod a bit to gain a little effective barrel length.


Your multi-catch plunger concept however is really interesting. And that's one thing that a diameter increase can accomplish. Given that the Caliburn was designed with the option of using Schedule 40 PVC for the plunger tube you probably have room in the stock area to use 1-1/2" ID 1-5/8" OD tubing for the plunger tube by just redesigning the pieces for the stock.

To be honest, I just wanted to challenge myself to design a mag-fed springer from scratch. I personally prefer fabricating my own designs as opposed to something that everyone else already uses. But as I got further in the process, it ended up borrowing a lot more design concepts from the caliburn than I intended. I guess that that shows how good the Caliburn's design is.

I'm hyped about the multi-stage catch too. If designed right, it should allow for max compression with multiple spring types.

Edit: Along with this project, I might try to fit the multi catch system into a caliburn. Hell, I think it might even fit into a 1 3/8th" PT.

In Topic: Trying to get back into it

13 March 2018 - 05:45 PM

Woah you have an engineering degree that obviously means you are a god of design and fabrication and make literally anything

In Topic: (WIP / DESIGN) Homemade SplitFire.

10 March 2018 - 11:12 AM

I might actually be able to create a lever- action trigger without moving the pump at all, by just having a rectangular cutout in the center of the trigger allowing it to pivot without hitting the pump. Of course the thickness would have to be enough so it wouldn't break, but I've been pleasantly surprised by the strength of PLA printed parts at 100% infill, having used them for plunger heads on full [k26] blasters with no issues.