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Unread 10-01-2012, 12:37
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Team 3489's Catapult Prototype

Inspired by Team Titanium, Category 5 decided to try a catapult, scavenging parts from our 2011 'bot:

http://youtu.be/cyMTlgvDjZM

It works pretty well propelled by both pneumatics and surgical tubing, but we need to control the distance. And to auto-load balls.
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Unread 10-01-2012, 13:06
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Re: Team 3489's Catapult Prototype

Looks pretty good, how do you plan to auto load the balls?
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Unread 10-01-2012, 13:06
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Re: Team 3489's Catapult Prototype

Looks pretty good! As long as you can a) control distance and b) aim somehow (via turret or turning the robot), you should have a pretty solid thrower, good job with thinking outside the box and using a catapult.
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Unread 10-01-2012, 13:09
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Re: Team 3489's Catapult Prototype

What kind of distance were you getting with your mock-up?
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Unread 10-01-2012, 13:13
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Re: Team 3489's Catapult Prototype

i like it a lot. even if u can't score consistently, if you were doing that from the far end of the field you'll be getting lots of shots off, and getting balls to your side of the field. The four basket arrangement might also help with the variability of the shots. you might not always hit the 3 pt shots but they could bounce off and land in one of the 2 pointers.
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Unread 10-01-2012, 13:13
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Re: Team 3489's Catapult Prototype

If you can control the distance and alignment, that will be a really killer half court(+) shooter. What a great start and good luck on refining it!

I'm thinking a robot name of "MJ" for that bot.
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Unread 10-01-2012, 13:21
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Re: Team 3489's Catapult Prototype

Quote:
Originally Posted by Tuba4 View Post
What kind of distance were you getting with your mock-up?
I think the trash can was about 25' away.

We haven't figured out auto-loading yet. A belt-type ball elevator is pretty simple. The tricky part is getting it from the top of the elevator to the "cup", one at a time.

Controlling distance is another challenge. We might preload the rubber tubing by winding it up around a spool with a revolution counter. And/or adjusting the air pressure. I wonder if we're allowed to use electronically-controlled pressure regulators?

This is getting complicated. A spinning wheel launcher is pretty simple.
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Unread 10-01-2012, 13:27
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Re: Team 3489's Catapult Prototype

If you're throwing that reliably from 25 feet, maybe you could consider specializing in throwing from the other side of the court, say like in your protected alley. This would allow you access to balls automatically from your alliance inbound area, and maybe you'll just always throw from x- distance away. sure it would limit your range of throwing, but hey "The Jack of all Trades is the Master of None." Being amazingly consistent at one thing is better than being somewhat consistent at a lot of things.
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Unread 10-01-2012, 15:56
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Re: Team 3489's Catapult Prototype

Get it to throw full field. I think it would be easier to make something for the inbounder to feed into than to make a ground-to-arm ball collector. I'm not totally convinced that it can't be done, since I haven't actually tried to design it, though.
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Unread 10-01-2012, 16:07
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Man you catapult is awesome.
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Unread 10-01-2012, 17:39
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Re: Team 3489's Catapult Prototype

Quote:
Originally Posted by Kevin342 View Post
I think the trash can was about 25' away.

We haven't figured out auto-loading yet. A belt-type ball elevator is pretty simple. The tricky part is getting it from the top of the elevator to the "cup", one at a time.

Controlling distance is another challenge. We might preload the rubber tubing by winding it up around a spool with a revolution counter. And/or adjusting the air pressure. I wonder if we're allowed to use electronically-controlled pressure regulators?

This is getting complicated. A spinning wheel launcher is pretty simple.
Get simplier, have 2 rails coming down to the launcher with a ball release barrier that can let balls through on the rail.
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Unread 10-01-2012, 18:49
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Re: Team 3489's Catapult Prototype

Glad we could help
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Unread 10-01-2012, 19:15
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Re: Team 3489's Catapult Prototype

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Originally Posted by TheGuyz View Post
Man you catapult is awesome.
Thanks! But remember when you watch these types of videos the robot is usually perfectly still, at a fixed distance and angle to the goal, and no other robots are harassing it.

What would really be awesome is a video of a robot making goals at 3 different distances.
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Unread 10-01-2012, 19:16
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Re: Team 3489's Catapult Prototype

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Originally Posted by Blackphantom91 View Post
Glad we could help
You could help even more by sending us your CAD files!
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Unread 10-01-2012, 20:33
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Re: Team 3489's Catapult Prototype

That would be no fun so you wouldnt learn. also there is a "TitaniumRule" which the GDC created we think because of us in 2009 (R78) in the rules so the design is illegal.
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