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My Latest Project

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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My Latest Project

Unread postAuthor: cornflake_81 » Wed Apr 23, 2008 10:43 pm

So, with a few successful designs/executions under my belt here recently, I garnered the confidence to tackle a more advanced valve.
I wanted something sleek and professional looking. I started designig and building one, but it was a mish-mash of threaded adapters and parts and, well, it just didn't look sleek or professional. I did quite a bit of research and came up with this design.

Image

This is my 1.5" porting piston in a 2" tee. Though this might seem like a pretty simple valve to some of you, this was probably the most involved component I've built yet. The piston itself is another 2" sanding drum (they just work so damn well) with a couple neoprene washers as a sealing face.

Image

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The barrel/chamber ports are fitted with 2" x 1.5" threaded hex bushing that have had the "hex" ground away. I also trimmed down the bottom to make them flush.

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The barrel port was difficult. I wanted the threads to be completely concealed. However, connecting a small length of 1.5" pvc (for the piston to seal against) was proving problematic. I discovered (by accident) that a 1.5" male thread adapter fits nicely inside the lip that prevents the pipe from passing through the tee. I chopped the threaded portion off, popped in a short length of 1.5", and epoxied it in place directly behind the barrel port bushing.

Image

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The back end required a little extra work as well. I made a sort of jig for my drill press and used a sanding drum (handy little things) to sand about an inch of the lip out of the pilot side of the tee. This let me insert a short length of 2" pvc into the housing followed by a plug (again, trimmed to fit flush) to give the piston about an extra inch of forward travel. This allows me to position the sealing face further forward in the barrel, which, admittedly, may or may not be beneficial. The extra "sleeve" actually protruded forward past the chamber port, so I trimmed it down as to not obscure it. A handful of 1/4" screws and a 1/2" threaded port on the back to round it out.

Image

Its not finished yet, I still have to seal up the back end. I'm guessing an o-ring would be the easiest route, but I'm having a hard time finding one thats the right size. I'm also not sure of my bumper which is a rubber gasket intended for a flapper valve. Its has an outer diameter of 2" and is about 1/4" thick and sits perfectly in the back of the pilot area. There is also currently a spring behind the piston. Any thoughts on that set-up will be greatly appreciated.

So, why did I post an unfinished piston? Well, I'm proud of it. If nothing else, I feel that it looks the part. But, also, I'm looking for creative criticism. If this one works as well as I'd like it to, I'd like to build another one just like it for a dual chambered golf ball cannon. So, whataya think so far?
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Unread postAuthor: LikimysCrotchus5 » Wed Apr 23, 2008 10:50 pm

Ah very nice. Wat did you have to do to get those fittings into the tee all the way.

So this is what unismond (sp?) meant.
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Unread postAuthor: elitesniper » Wed Apr 23, 2008 10:54 pm

beautiful! , but I think MrC had a problem with the bolts for servicing because they add allot of stress to the tee when the piston constantly hits, make sure you have a good bumper.
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Unread postAuthor: cornflake_81 » Wed Apr 23, 2008 10:59 pm

LikimysCrotchus5 wrote:Ah very nice. Wat did you have to do to get those fittings into the tee all the way.


I made a jig for my drill press that allowed me to sand off the hexagonal part of the bushing (the part that won't fit in the tee).

Image

After that, I just measured the depth of the socket, subtracted the length of the bushing and cut off the difference from the back.

So this is what unismond (sp?) meant.


Hmm?

elitesniper wrote:beautiful! , but I think MrC had a problem with the bolts for servicing because they add allot of stress to the tee when the piston constantly hits, make sure you have a good bumper.


Thanks! I was leary about the bolts, too. I'll keep searching...
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Unread postAuthor: LikimysCrotchus5 » Wed Apr 23, 2008 11:01 pm

Thats how i thought you did it. Only if i had a drill press.....:cry:

Unismond is a member here at spudfiles that was trying to explain this to me, but after seeing a visual description, such as your picture, i understand now what he was explaining.
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Unread postAuthor: clide » Wed Apr 23, 2008 11:18 pm

Looks great. I can certainly tell you did your homework and took the time to do things right.

I've also never really been a fan of bolt-on piston plugs just from a safety standpoint. However many people have used them without problems, so they probably can't be that bad. One thing you may consider for future valves is trying to bolt on the threaded seat bushing rather than the rear plug. It experiences the same force due to pressure, but it doesn't have the impact of the piston on every shot.
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Unread postAuthor: bigbob12345 » Wed Apr 23, 2008 11:22 pm

It looks like you accomplished your goal
It really does look very clean and proffesional
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Unread postAuthor: Lentamentalisk » Wed Apr 23, 2008 11:27 pm

That is an absolutely beautiful work of art you have there. I second the bumper, go for a nice spring and some rubber, you can never have to much bumper. Once again, absolutely beautiful!
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Unread postAuthor: cornflake_81 » Wed Apr 23, 2008 11:32 pm

clide wrote:Looks great. I can certainly tell you did your homework and took the time to do things right.

I've also never really been a fan of bolt-on piston plugs just from a safety standpoint. However many people have used them without problems, so they probably can't be that bad. One thing you may consider for future valves is trying to bolt on the threaded seat bushing rather than the rear plug. It experiences the same force due to pressure, but it doesn't have the impact of the piston on every shot.



Thanks, clide. The idea of bolting in the barrel bushing actually crossed my mind...I think I'll implement that.

bigbob12345 wrote:It looks like you accomplished your goal
It really does look very clean and proffesional


Thanks, bigbob.

Lentamentalisk wrote:That is an absolutely beautiful work of art you have there. I second the bumper, go for a nice spring and some rubber, you can never have to much bumper. Once again, absolutely beautiful!


Appreciated! I was curious about what kind of effect the spring would have on operation.
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Unread postAuthor: Gippeto » Wed Apr 23, 2008 11:40 pm

Very nice job on the valve. :)
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Unread postAuthor: Velocity » Thu Apr 24, 2008 12:02 am

clide wrote:Looks great. I can certainly tell you did your homework and took the time to do things right.

I've also never really been a fan of bolt-on piston plugs just from a safety standpoint. However many people have used them without problems, so they probably can't be that bad. One thing you may consider for future valves is trying to bolt on the threaded seat bushing rather than the rear plug. It experiences the same force due to pressure, but it doesn't have the impact of the piston on every shot.

How clutch is this <a href="http://www.spudfiles.com/forums/mega-build-3-ported-valve-t7344.html">memory</a> ? It came to my head as soon as clide started talking about the position of the bolts.

Nice build...I love the flush pieces.
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Unread postAuthor: cornflake_81 » Thu Apr 24, 2008 12:37 am

Thanks for the compliments, Gippeto & Velocity. I'll try to finish this up in the coming days. Once I get it on a cannon, I'll post it up.
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Unread postAuthor: MrCrowley » Thu Apr 24, 2008 12:53 am

Very nice, very clean. Good idea with the flush fittings :)
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Unread postAuthor: psycix » Thu Apr 24, 2008 10:04 am

Clean indeed!
Looks sweet :D

I understand your proudness.
Good job so far.

When will we see "results"?
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Unread postAuthor: cornflake_81 » Thu Apr 24, 2008 2:23 pm

psycix wrote:Clean indeed!
Looks sweet :D

I understand your proudness.
Good job so far.

When will we see "results"?


Thanks. I hope to at least be able to test the valve by this weekend. As far as the actual gun that this is intended for, it'll probably be a couple more weeks. As usual, it started out as a plan for a simple little golf ball chucker, and has morphed into "big plans".
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