Search found 652 matches

by BigGrib
Mon Mar 08, 2010 12:07 am
Forum: Combustion Cannons
Topic: My first Cannon
Replies: 36
Views: 15740

OK, nice gun, buuuuut, and I'm surprised noone has told you this yet, 1. The two elbows are dwv, drain waste vent, and are not pressure rated. They will blow. 2. It appears to me that you mixed ABS and PVC when putting together the end cap adapters to the chamber. That is a no no unless you bolt the...
by BigGrib
Sun Mar 07, 2010 11:49 pm
Forum: Pneumatic Cannons
Topic: Grib's New Pnuematic & Ammo
Replies: 3
Views: 1685

I would love to do something with a semi-auto, it would just be a matter of building the parts to make the mag and all that.
by BigGrib
Sun Mar 07, 2010 9:05 pm
Forum: Pneumatic Cannons
Topic: Grib's New Pnuematic & Ammo
Replies: 3
Views: 1685

Grib's New Pnuematic & Ammo

Hey Guys, It's been a while since I've built a cannon mainly for the lack of decent ammo. I came across something that I thought I could use and actually found some PCV that would fit it perfectly. The Ammo: White Labs Liquid Brewers Yeast Vial (1 litre soda bottle blanks) Modified with a self tappi...
by BigGrib
Sun Mar 07, 2010 6:34 pm
Forum: Pneumatic Cannons
Topic: SGTC Supah Valve
Replies: 4
Views: 2919

Well you should be able to find it on the SGTC Website, I'm pretty sure, and the reason you cant find a Supah Valve outside of the SGTC is because the Supah Valve is proprietary to the SGTC.
by BigGrib
Sun Mar 07, 2010 2:36 pm
Forum: Pneumatic Cannons
Topic: Coaxial connector
Replies: 16
Views: 4586

thats what i'm wondering. you say " a proper reducer" but what do you use for your proper reducer to connect the barrel? is it just a nipple that you have the barrel epoxied into or is their another way? A Proper reducer is just that a proper reducer. If your chamber is 4" in diaameter and your bar...
by BigGrib
Fri Mar 05, 2010 3:00 pm
Forum: Combustion Cannons
Topic: 9V in chamber
Replies: 12
Views: 2712

I dont know about mounting your 9v batteries in the chamber. Seems like a bad idea to me. Here is a link to one of my combustion guns that has a chamber fan in it, held in place by two machine screws. http://www.spudfiles.com/forums/blue-bl ... 11441.html
by BigGrib
Mon Feb 08, 2010 9:35 pm
Forum: Ammo & Parts
Topic: Camlocks for quick burst disk/barrel change problem.
Replies: 9
Views: 2559

what material are your camlocks vinyl or aluminum? i have an sdr21 1.5" 6.5' barrel with aluminum camlocks and it is not sleeved at all. i have no bending whatsoever. I would have sleeved mine a little bit if i could have found sch but i was only gonna do mine about a foot down the barrel.
by BigGrib
Wed Feb 03, 2010 9:05 pm
Forum: Pneumatic Cannons
Topic: simple co-ax with attached stock
Replies: 53
Views: 13869

My guess is that because the breech split, all the pressure was lost, and therefore the projectile failed to penetrate the milk jug.


You should make a breech out of cast epoxy.
by BigGrib
Sat Jan 23, 2010 3:33 am
Forum: Combustion Cannons
Topic: fans.....
Replies: 16
Views: 4792

why would you put a chamber fan on a spray and pray, no need. i would hold off on the chamber fan until you're ready to go to a more advanced combustion.
by BigGrib
Fri Dec 11, 2009 3:12 pm
Forum: SpudFiles Discussion
Topic: An ignore feature?
Replies: 4
Views: 1781

wut u hate stuf like dis, i bet u really wan me 2 stop tiping like a moron huh, yeah I hate that as well.
by BigGrib
Sun Jan 25, 2009 1:36 am
Forum: Pneumatic Cannons
Topic: Soda Bottle Chamber
Replies: 26
Views: 3551

Toally agree with mr. c on this one, pvc is made to to handle repeated applications of pressure, soda bottles not so much, and i'm sure you're not gonna feel to swell when it blows up.
by BigGrib
Sun Dec 14, 2008 4:38 am
Forum: Off-Topic Hobbies
Topic: OMG! Spudtech's back!
Replies: 18
Views: 4155

PCGUY wrote:Welcome to 6 months ago :lol:
I guess I need to get on more!!
by BigGrib
Sun Nov 30, 2008 4:55 am
Forum: General How-To & Discussion
Topic: ignitor help!!
Replies: 7
Views: 1939

The best way to do it is a couple #6 machine screws drilling through double layers of pvc or abs. put a nut outside the chamber and one inside the chamber and it will allow you to precicely adjust your spark gap. Then I attach the wires coming off the piezo to the spark gap. This takes away the forc...
by BigGrib
Fri Nov 21, 2008 6:16 pm
Forum: Ammo & Parts
Topic: Cellular core ABS
Replies: 15
Views: 5395

Just because it says SCH 40, doesn't mean it's pressure rated. True True. Sch is just a way to guage wall thickness. Anyway, I have never used Pressure Rated ABS, mainly because I live in America, the land of the free and the home of Cell Core ABS, and I have never had a problem with it. Now this i...
by BigGrib
Tue Oct 28, 2008 3:05 pm
Forum: Combustion Cannons
Topic: Can I fire my spudgun with the fan ON ?
Replies: 10
Views: 3227

The fan should be near the breach end of the gun so there isn't a large volume of gas, moving at high velocity, blowing past the fan's blades during firing. This is also to aid in installing and removing the fan as needed so one does not have to insert his/her whole arm into the chamber and get it ...