TBMA-230 V2.0

[sgort87]

Nice job! Now take it apart.

Kudos on using the 5-way valve. It's not to its full potential though. It's technically just a 4-way as it is now. Let me make a suggestion.

As long as your valve will work in reverse directions, you can eliminate the manual fuel valve by arranging the port configuration as shown. Your fuel will fill the meter pipe while air is filling the chamber, and in the other position the meter will dump while air is pressurizing the piston. After the shot, it will be in position 1 already, so air will purge the chamber automatically.

The only thing I can think of that may get in the way a little bit is that some of the fuel may escape while the piston is seating. With a little tweaking of the meter pressure, it's probably of no real concern.

Also, you can get rid of the little ball valve at the piston by replacing it with a check valve.

Awesome cannon. I hope this helps to improve it.

[SpudBlaster15]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

[SpudBlaster15]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

[sgort87]

Well, the valve protection can also be solved with a check valve.

As for the operation in the 5-way configuration, the chamber wouldn't be pressurized until after the fuel was injected. Since the piston is pulled back after the shot, any air going into the chamber would just be purging until the position is changed and fuel is dumped while simultaneously pressurizing the piston pilot.

This would only work with an air compressor or bottle. I see in the video you are using a hand pump. The way to get around this would be to use the fuel to also actuate the piston. I'm not sure how tight your seals are, so this could either be your fuel injection point or an isolated section where the fuel just leaves as waste when the valve unseats.

As for pricing, yeah, the right check valves can be a bit costly. I've found that the right parts are worth it though. Streamlining everything down to the smallest detail can make things much easier, more fun, and cooler. It's all up to how you wanna do it though. If this isn't your favorite toy, I wouldn't bother.

[SpudBlaster15]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

[sgort87]

Hmmm, too bad. So close, but I guess there's really no way to solve all the quirks.

[SpudBlaster15]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

[mobile chernobyl]

Hey.. at least the likelihood of being able to reuse it is higher! Was it over or under 50USD?

[SpudBlaster15]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

[mobile chernobyl]

That's CHEAP for ANY 316 SS fitting... you should not feel bad at all!

[POLAND_SPUD]

OMG it is so awesome... would you be so kind as to post plans of it ??

[Lockednloaded]

Does the spool kick back pretty violently? I'm thinking if making mine a spool valve, but I may have to make a shell around it that protects the shooter

[SpudBlaster15]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

[jackssmirkingrevenge]

[Zeus]

OMG it is so awesome... would you be so kind as to post plans of it ??

Sure, here you go:

Diamond barrel

Good choice SB, as the aforementioned research shows that...

Due to extensive research done by the Fourchon University of Science, diamond has been confirmed as the the hardest metal known the man. The research is as follows.

Pocket-protected scientists built a wall of iron and crashed a diamond car into it at 400 miles per hour, and the car was unharmed.

They then built a wall out of diamond and crashed a car made of iron moving at 400 miles an out into the wall, and the wall came out fine.

They then crashed a diamond car made of 400 miles per hour into a wall, and there were no survivors.

They crashed 400 miles per hour into a diamond traveling at iron car. Western New York was powerless for hours.

They rammed a wall of metal into a 400 mile per hour made of diamond, and the resulting explosion shifted the earth's orbit 400 million miles away from the sun, saving the earth from a meteor the size of a small Washington suburb that was hurtling towards midwestern Prussia at 400 billion miles per hour.

They shot a diamond made of iron at a car moving at 400 walls per hour, and as a result caused two wayward airplanes to lose track of their bearings, and make a fatal crash with two buildings in downtown New York.

They spun 400 miles at diamond into iron per wall. The results were inconclusive.

Finally, they placed 400 diamonds per hour in front of a car made of wall traveling at miles, and the result proved without a doubt that diamonds were the hardest metal of all time, if not just the hardest metal known the man.