Chief Delphi - 3883 ball grabber prototype

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Robot Showcase (http://www.chiefdelphi.com/forums/forumdisplay.php?f=58)

- - 3883 ball grabber prototype (http://www.chiefdelphi.com/forums/showthread.php?t=99731)

FRC3883FRC

10-01-2012 22:52

Re: 3883 ball grabber prototype

Well I hope we can help get the ideas rolling for you guys!

Ian Curtis

10-01-2012 23:10

Re: 3883 ball grabber prototype

Quote:

Originally Posted by FRC3883FRC (Post 1102121)

Thanks guys for the comments. Any help is welcome. This is why it is a prototype can still try out different variations of tubes, paddles, and any other things. I think we will try some of the ideas on here. Thanks for all the input again!

It's great that people are posting prototyping! Something to consider is that sometimes the dynamics of the intake change depending on what is moving. We built a great collector in 2006 when the balls were rolled into the collector, but it did not work when the collector rolled into the balls. :o

Be careful when you stick outside of your frame perimeter with those fingers if you mount it on an outer edge too.

As an aside,
Is there really a huge need for "Welcome to CD Posts"? I like to think it's a pretty welcoming community on it's own and posting "Welcome to CD" in really big font really just takes up space. CD doesn't bite. :cool:

Andrew Lawrence

10-01-2012 23:15

Re: 3883 ball grabber prototype

Quote:

Originally Posted by Ian Curtis (Post 1102171)

It's great that people are posting prototyping! Something to consider is that sometimes the dynamics of how the intake changes depending on what is moving. We built a great collector in 2006 when the balls were rolled into the collector, but it did not work when the collector rolled into the balls. :o

Be careful when you stick outside of your frame perimeter with those fingers if you mount it on an outer edge too.

As an aside,
Is there really a huge need for "Welcome to CD Posts"? I like to think it's a pretty welcoming community on it's own and posting "Welcome to CD" in really big font really just takes up space. CD doesn't bite. :cool:

A "Welcome to CD!" post has no value. I only put it as an aside from an actual reply to the post, with useful information in it. Plus, it makes the welcomed feel fuzzy inside! :D

peyton122995

10-01-2012 23:22

Re: 3883 ball grabber prototype

Quote:

Originally Posted by SuperNerd256 (Post 1102126)

No fair! I've been at a meeting! :p Glad to see my welcome used though, and thanks for referencing me. :)

My team was planning on useing the red zip-tie things. And adding two of them on top of eachother to suck it up and force it vertically. But I like the Rubber idea it grabs a lot better than plastic.

And can I have a welcome?

Andrew Lawrence

10-01-2012 23:25

Re: 3883 ball grabber prototype

Quote:

Originally Posted by peyton122995 (Post 1102187)

Unfortunately, I only give it to people who just did their first post when I see it. You have 2. :| I'll give you a smaller welcome anyways, though: welcome

Back to the thread, I love the ball grabber prototype! I think we may be using something like this on our bot! Is that regular surgical tubing, or is it a special kind?

FRC3883FRC

10-01-2012 23:37

Re: 3883 ball grabber prototype

It regular surgical tubing that comes with the kit. The rubber really seemed to grab and pull the ball in even at slow speeds. Like I have said before Im glad you all are liking and suggesting ways to improve. Thats way its a prototype. Glad to help out other teams with ideas. Hope to see what others come up with!

SenorZ

11-01-2012 22:52

Re: 3883 ball grabber prototype

Doubt the tubing is really needed. I connected a 1.5" ABS tube to a drill and it compressed the ball about 2" and pulled it under, even with the drill at a very low speed.

These balls are very grippy.

Alex.q

11-01-2012 23:25

Re: 3883 ball grabber prototype

Hey you just gave me an idea... Now to figure out how to build what's in my head. Oh, and I like how you made a fast prototype with cardboard and and drill. My team's is not as good at that; we tend to over complicate prototypes.

Quote:

Originally Posted by SenorZ (Post 1103154)

So you only used the bare ABS, no grippy material? Interesting...

Related Question: How much do people plan on compressing the ball to collect it?

Andrew Lawrence

11-01-2012 23:29

Re: 3883 ball grabber prototype

Quote:

Originally Posted by Alex.q (Post 1103201)

Related Question: How much do people plan on compressing the ball to collect it?

Not much, maybe by a half an inch to an inch. You still want to be able to go over it, but too little compression and you won't be able to collect it.

EricH

11-01-2012 23:30

Re: 3883 ball grabber prototype

Quote:

Originally Posted by peyton122995 (Post 1102187)

My team was planning on useing the red zip-tie things. And adding two of them on top of eachother to suck it up and force it vertically.

The red zip-tie things from the Kit? The ones with numbers on them? Are those what you're talking about?

If they are, DO NOT DO IT! Those are for bagging the robot. Use those only for that purpose.

Use other zip ties instead.

Ninja_Bait

11-01-2012 23:31

Re: 3883 ball grabber prototype

Quote:

Originally Posted by Alex.q (Post 1103201)

Related Question: How much do people plan on compressing the ball to collect it?

We're doing rollers that are at a height a little bit less than the ball. Either it'll squish the ball or the robot will jump up a little bit, but either way it'll acquire.

viper196

12-01-2012 00:31

Re: 3883 ball grabber prototype

On my team im in charge of the collection process. So im curious would it be ran on a motor so you can stop it if you have three balls collected? Or what would you do? And ill give a big welcome to you since this is my first time also haha WELCOME TO CD :)

Aren Siekmeier

12-01-2012 01:45

Re: 3883 ball grabber prototype

Quote:

Originally Posted by Alex.q (Post 1103201)

So you only used the bare ABS, no grippy material? Interesting...

Related Question: How much do people plan on compressing the ball to collect it?

We tested just a bare PVC pipe and that worked fine. However adding some little foam fingers we had lying around greatly improved the speed with which it attained control over the ball (there's a video somewhere, maybe a week 1 compilation coming out soon?). It looks like the bare pipe does the job, but adding something usually makes it even better.

For compression I think we had like half an inch. The guys who did would know exactly. For shooting we needed a fair bit more, like 1.5" total compression I think.

Elgin Clock

12-01-2012 02:01

Re: 3883 ball grabber prototype

If you find the tubing you are using to be a little less than desirable as far as rigidity, try upgrading to poly cord as shown here.

http://www.chiefdelphi.com/media/photos/32576

We've used this countless times in the past with much success just the way you are using your tubing.

Here's an overview of one robot of ours showing the poly cord holding the balls in place ready to spin & eject them.
http://www.chiefdelphi.com/media/photos/32893

FRC3883FRC

12-01-2012 08:45

Re: 3883 ball grabber prototype

Thanks for all the input guys really liking all the other options our team can try out. Also you guys did a great job breaking the view counter on youtube! Never had a video do that. Its great to see that its still getting a lot of views! Will update today, finally get to work on the robot again!

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