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Auto Tennisball Launcher

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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Auto Tennisball Launcher

Unread postAuthor: jackssmirkingrevenge » Sun Oct 04, 2009 12:31 am

Not mine, found this on youtube.

[youtube]http://www.youtube.com/watch?v=aIox-FH2yVY[/youtube]

Performance is (perhaps intentionally?) sh1te and rate of fire grannyesque, but a well made project nonetheless.

[youtube]http://www.youtube.com/watch?v=sJZ1o8XpaZc[/youtube]

Image

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Unread postAuthor: Moonbogg » Sun Oct 04, 2009 12:39 am

That thing is ridiculously over complicated for what it does. Not to be a jerk, but its my opinion. You're better off taking the contest winner cannon and attaching motorized arms to it.
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Unread postAuthor: Technician1002 » Sun Oct 04, 2009 12:41 am

Nice. We could teach the builder a few things. I like the automation, but I don't like the huge restriction to flow between the accumulator (chamber) and the barrel. After the tennis ball has left you can still hear the chamber hissing. That is wasted power.

He did a nice job breadboarding the automation circuit so it would drive the control solenoids. It works well. It looks like the work of a robotics student.
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Unread postAuthor: D_Hall » Sun Oct 04, 2009 1:02 am

Technician1002 wrote:It looks like the work of a robotics student.

Agree. It's clear that raw performance or rate of fire was NOT something the builder was concerned with. He was looking for an excercise in automation - and he found one!
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 04, 2009 1:03 am

Technician1002 wrote:Nice. We could teach the builder a few things


In terms of ballistic performance, certainly, but as to the wiring I'd be the student :) I'm sure the amount of steps for reloading could be reduced too, let's face it you don't need an externally powered breech.
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Unread postAuthor: Moonbogg » Sun Oct 04, 2009 1:14 am

jackssmirkingrevenge wrote:
Technician1002 wrote:Nice. We could teach the builder a few things


In terms of ballistic performance, certainly, but as to the wiring I'd be the student :) I'm sure the amount of steps for reloading could be reduced too, let's face it you don't need an externally powered breech.


Damn, the cannon in your link is awesome.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 04, 2009 1:25 am

Moonbogg wrote:Damn, the cannon in your link is awesome.


Yup, winner of the previous challenge to which my pen gun came second :roll: :D
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Unread postAuthor: inonickname » Sun Oct 04, 2009 2:01 am

I'm not sure why he used so many pneumatic rams for feeding in a role that required at most one..

But it's pretty cool, albeit some of the things hurting performance will certainly be painful to some here.
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Unread postAuthor: al-xg » Sun Oct 04, 2009 6:16 am

Interesting to see the different spin to the tennis ball on each shot.
Would be good for testing hop ups and so on. A good feature due to low power.
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Unread postAuthor: psycix » Sun Oct 04, 2009 6:36 am

Hehehe that sound! :lol:
Rhythmic hissing. Spudgun music.
Crappy performance, but it looks cool!
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Unread postAuthor: geniusbomberman » Sun Oct 04, 2009 10:42 am

That hose probably adds a lot of dead space. putting the valve on the moving barrel would have operated better
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Unread postAuthor: POLAND_SPUD » Sun Oct 04, 2009 11:15 am

lol... yep it's overcomplicated as hell... but I like it

it would be more impressive if it cycled faster

EDIT
It would be even more impressive if he used this :wink:

notice how useful it would be for full auto guns
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Unread postAuthor: chenslee » Sun Oct 04, 2009 7:41 pm

This guy and I conversed through youtube a while back. He admited to being a controls guy rather than a mechanical guy.

I found his videos and then realized he had subscribed to my youtube months earlier!
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