The __jrP4__ - Junior Portable Pnuematic Projectile Propogator

Step 3 Build barrel and diaphram

1) Whatever you chose for your parts for (C), you need to remove the stop ring on the inside of the 1/2" FS, so the 1/2" pipe will slide through it instead of just fitting on the end. I used a sanding drum on the end of a dremel.

2) Cut the diaphram to just barely fit into the inside of (D) (1 1/2" FT). It should fit freely, but not have a lot of room to slide side-to-side.

3) This is the most critical step in the process. Take the time to understand how the gun works. The inside end of the barrel must be flush with where the diaphram sits on the 1 1/2" FT end of (E). To do this, set the diaphram on the end of (E), holding it upright, and screw it into the chamber until it is snug, then back it off a little. Still holding it upright, slide the barrel in until it sits on top of the diaphram. This is where you want it cemented. Mark the location where barrel enters (E). Remove (E) and the diaphram and then cement the barrel in, making sure to keep the end centered in the chambe where it will meet the diaphram.

Comments

[immell_99]

what exactly did u use 4ur diaphram?

[dschwant]

It is rubber a little less than 1/8 in thick. I think you can get it in the plumbing supplies, but I just had it sitting around in the garage.