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Unread 23-04-2006, 15:37
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Re: Jammed Ball Bin-Storage Help!

If you saw our hopper at Davis, it jammed but required only minor shaking of the robot to unjam it. it holds about 15 balls, but yours would be mounted lower, allowing more capacity

Stop by our pit at nationals to take a look at our hopper.
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Unread 23-04-2006, 15:41
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Re: Jammed Ball Bin-Storage Help!

Thanks for all the input!

It seems like the most widely held opinion is that gravity-fed bins will always have the potential to jam.

Realizing this, I think my best bet is to make some kind of agitator (probably like the one drawn by BurningQuestion).

Despite my preliminary misgivings I am beginning to see how using an agitator might actually be easier than redesigning the bin.

Based on people's ideas (and the bins of other robots) I created a CAD model of the new bin. It is similar to the bin most people thought was least likely to jam (bin #2), with offset angles (as recommended by Jonathin Norris).





Looking at the design I am already beginning to see new jamming issues. There is also the problem of how to transport the plastic to Atlanta...
Overall it looks more difficult to build than an agitator, which is probably what I'll wind up doing.

Does the new design look workable/less likely to jam?
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Unread 23-04-2006, 16:27
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Re: Jammed Ball Bin-Storage Help!

Quote:
Originally Posted by Hachiban VIII
Thanks for all the input!

It seems like the most widely held opinion is that gravity-fed bins will always have the potential to jam.

Realizing this, I think my best bet is to make some kind of agitator (probably like the one drawn by BurningQuestion).

Despite my preliminary misgivings I am beginning to see how using an agitator might actually be easier than redesigning the bin.

Based on people's ideas (and the bins of other robots) I created a CAD model of the new bin. It is similar to the bin most people thought was least likely to jam (bin #2), with offset angles (as recommended by Jonathin Norris).





Looking at the design I am already beginning to see new jamming issues. There is also the problem of how to transport the plastic to Atlanta...
Overall it looks more difficult to build than an agitator, which is probably what I'll wind up doing.

Does the new design look workable/less likely to jam?

The design is very similar to 254's hopper. theirs still jammed and required shaking to unjam it
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Unread 23-04-2006, 16:45
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Re: Jammed Ball Bin-Storage Help!

It will be awfully hard to keep them from jamming without an agitator of some sort. Maybe if you did somethng like this. Shallow sides.



(crudely done on MS Paint) Both sides should be the same distance from the smaller opening.
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Last edited by Dan Petrovic : 23-04-2006 at 16:51.
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Unread 23-04-2006, 16:52
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Re: Jammed Ball Bin-Storage Help!

We found that the most jamming came from balls being stacked vertically, just like in the pictures you just posted. We made the bottom of our hopper large so that none of the ten starting balls were stacked on top of each other. If the balls are put in in the same pattern at the beginning of each match, then it will work every time (it did for us)

I highlighted the funneling parts of the hopper in our picture. The bottom of our hopper is at about a 30 degree angle and the two strips near the bottom just keep balls from getting hung up on the walls near the bottom. We also tried to put a shelf in right over the exit to prevent stacking, and it did it's job perfectly.
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Unread 23-04-2006, 17:12
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Re: Jammed Ball Bin-Storage Help!

Quote:
Originally Posted by InfernoX14
It will be awfully hard to keep them from jamming without an agitator of some sort. Maybe if you did somethng like this. Shallow sides.
Shallow sides BAD...

Yea we spent a lot of time on this during the season and found that we got the lowest amount of jams with a hopper 3 wide funneling into a single channel. Having one side slightly higher, like no more than 1" helped. But you need the relatively steep slope in there. The steeper the slope the greater gravity is acting on the balls, helping to get rid of jamming. But in any of these systems without an agitator there is the potential for jamming.
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Unread 25-04-2006, 10:38
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Re: Jammed Ball Bin-Storage Help!

another idea....a hopper that's only one ball wide, this is the side view. the ramps would keep the balls in line.

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