Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 70 users online :: 5 registered, 0 hidden and 65 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

diaphragm pistol completed!!

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

diaphragm pistol completed!!

Unread postAuthor: djt » Thu Oct 26, 2006 6:51 pm

this is my new diaphragm pistol. The chamber is 1 1/2 inches and the barrel is 1/2. The diaphragm is just a circle of 3/16 neoprene. 3/8 inch ball valve for the pilot valve. i was going to use a blowgun with a hose so the gun only took one hand to operate but it didnt release the air fast enough.

oh and one question, is there any way i can reduce dead space? i cut the barrel a little too short so there is alot of room between the end of the barrel in the chamber and the pilot valve. i dont really want to glue anything on because as of now the cannon works fine (My first functioning homemade valve cannon). i was thinking of just sticking on a 1/2 inch coupling on the end of the barrel in the gun to add length and reduce the dead space. probably wouldnt hold pressure with glue though.

Im also going to add a small onboard bike pump

by the schrader on the bottom of the handle was where i was going to fill the gun from. then i decided to put it in the cap instead because of more convenient bike pump placement. plus its smart to have it behind the diagphragm
  • 0

Attachments
IMG_0583.JPG
the gun
IMG_0584.JPG
schrader and pilot valve in the endcap

djt
Major
Major
 
Posts: 387
Joined: Sat Mar 11, 2006 4:30 pm
Reputation: 0

Unread postAuthor: Flying_Salt » Thu Oct 26, 2006 7:03 pm

Hey where can I get those bike pump adapter nozzle things?
  • 0

User avatar
Flying_Salt
Brigadier General
Brigadier General
 
Posts: 779
Joined: Mon Oct 09, 2006 4:57 pm
Location: Texas
Reputation: 0

Unread postAuthor: djt » Thu Oct 26, 2006 7:37 pm

huh? you mean the valve that i used (schrader) to fill the gun? any auto parts store will have those, as well as bike shops
  • 0


djt
Major
Major
 
Posts: 387
Joined: Sat Mar 11, 2006 4:30 pm
Reputation: 0

Unread postAuthor: SpudStuff » Thu Oct 26, 2006 7:53 pm

Nice. BUT, the coupler, wye, cleanot and cleanout adapter are DWV, not rated for pressure. If I were you I would rebuild it because it is a great design and look. The fittings may say sch 40 but they are DWV due to the short socket length.
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: djt » Thu Oct 26, 2006 7:56 pm

really? dangit so THATS how you tell. I think i will just take my chances though because i dont think im going to be taking past like 60 psi. thanks for the concern though. this is just one of those guns that i made for portability, not power.
  • 0


djt
Major
Major
 
Posts: 387
Joined: Sat Mar 11, 2006 4:30 pm
Reputation: 0

Unread postAuthor: SpudStuff » Thu Oct 26, 2006 8:10 pm

Look at the damn bushing, it is 1/3 in the socket. Also look at the fitting it will say NSF DWV. It shoud be in a different section at the store too.
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: jjk92 » Fri Oct 27, 2006 6:25 pm

id like too point out that uve made like all of ur guns out of dwv and ur still here so there really isnt any need for concern
  • 0

User avatar
jjk92
Staff Sergeant
Staff Sergeant
 
Posts: 127
Joined: Thu Apr 06, 2006 5:22 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: noname » Sun Oct 29, 2006 4:08 pm

Just pop a few screw into each fitting and your fine. And about the 1/2" coupler on the barrel, you could glue it on fine. Try it.
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'