Tee vortex BBMG

2005-10-24T19:19:23Z

Ian2accurate:

This specifically shaped object made of a semi-hard to hard material is used in a [[BB machine gun]] to take bb's located outside of this part and suck them into the barrel of the [[BB machine gun]]. Some people use [[lathes]] in order to turn pieces of aluminum for the construction of a vortex, while others prefer using [http://www.bondo-online.com/catalog_item.asp?itemNbr=176 Bondo Auto Body Filler] molded in a PVC plug. Designs for building a Bondo vortex can be found on Burnt Latke's [http://www.burntlatke.com/bb.html BB machine gun construction] page.

Ball valve

2005-10-24T18:57:40Z

Ian2accurate:

[[Image:Ball_valve.jpg|frame|A typical PVC ball valve]]
'''Ball valves''' open with a 90* twist of lever. They are the cheapest valve you can get, but also (typically) yield the worst performance, due to the slow [[opening time]].
The flow of a ball valve, however, is quite good due to its straight-through nature. This will tend to even out the situation in cannons with very long barrels and/or heavy projectiles (and thus long barrel dwell times).

Openning time can be shortened by:
* Using a spring, or a pneumatic ram to actuate the valve
* Applying dish soap or other lubricant to the moving part. Oil or oil based lubricants should ''not'' be used, because they can damage the seals. Lubricating the ball valve will decrease friction and will result in a faster opening time.

However, there is more performance to be gained by using a faster valve, such as a [[butterfly valve]], [[piston valve|piston]] or [[diaphram valve|diaphram]] valve, or a [[burst disk]].

[[category:valves]]

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Tee vortex BBMG

Ball valve