UDTBC-10 (my new 3'' piston valve)

[unisonmind]

well i was trying to find a clean barrel support for 3 days and then i was walking around at work stoped to help a customer and there it was

and the fancy rubber thing i stole from clide right off the home page pic
(thanks clide)

and yes it was clear primer

[Fnord]

That'll make a nice inside-shooting-for-the-winter gun

Great job, it seems you have created one of the few large-bore cannons that don't look like a mess of parts.

It's nearly perfect, but it's going to need paint!

[iknowmy3tables]

you are truly a craftsman unison
so clean

[clide]

and the fancy rubber thing i stole from clide right off the home page pic
(thanks clide)

I actually stole that from somebody else, unfortunately I can't remember who it was.

Slick gun, that thing will pack a wallop.

[mtronic]

one word.....omfg...... wow that is HUGE!!!!! Cant wait for the vids

[glass_05]

great looking gun. that is exactly what i want to build. how do you seal the back plug. i see an o-ring and something else. also did u just drill holes and run bolts through to keep it from shooting out?

[Tooo Easssyy]

wow............
that looks awesome, great job with it, looks in great condition especially the piston valve.

get some movies with it soon to see what it really does, yeah !!!!!!

[unisonmind]

great looking gun. that is exactly what i want to build. how do you seal the back plug. i see an o-ring and something else. also did u just drill holes and run bolts through to keep it from shooting out?

the back plug is a 3''nptx1.5''npt bushing(i use the npt x npt and not a slip x npt because it is more heavy duty)-- the yellow stuff is epoxy-- i put the bushing in a 3'' coupling and filled the gap with epoxy to give the plug good fit in the tee then used a file to put the o-ring grooves

wow............
that looks awesome, great job with it, looks in great condition especially the piston valve.

get some movies with it soon to see what it really does, yeah !!!!!!

i was going to go blow something up today but it snowed ya i know its may but i live in colorado but i did make this little video the other day at work


[youtube][/youtube]

[glass_05]

could u list a more detailed parts list? and any other information that would be usefull. i plan on making a gun very similar to this

[JDP12]

first start by searching, then by reading the wiki, then search some more. isn't that complicated

[glass_05]

okay. just noticed the new video. it helped me alot. i was wondering what the piston sealed against but now i can clearly see that. thank you!

[dongfang]

Hi,

Wow, very similar in size to my own Orange Accelerator.

That´s a beauty! I like the chamber in particular.

Are u sure those bolts are large enough? I would have used a few more or a little larger bolts.

Regards
Soren

[unisonmind]

ya i used 8 bolts and they 3/4'' long x 6mm so i think it should be fine-- what do you have in your cannon?

[dongfang]

Hi,

I used 12 * 6mm´s.

In another cannon, I had a 63 mm (ID) tee and 8 * 6mm bolts to hold the breech. That was too small / too few. There simply was too much (shear) pressure on the bolts when the piston hit the bumper; they started to deform the PVC. I have now changed that cannon to 8 * 8mm.

My rule of thumb (awaiting more verification - overkill or just right?) is now something like: Blot count * bolt diam. = tee diam.

Regards
Soren

[unisonmind]

ya maybe ill put some 8mm in there-- i used 9-4mm in my GB cannon so i was thinking 6mm would be ok but like you said overkill is not a bad thing - maybe ill even go with 3/8'' i have the room