Inventorbot Challenge #3 Problem
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Inventorbot Challenge #3 Problem Biff 06-17-2006
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Posted by Biff on June 17, 2006, 10:27 am
As brand new Mindstorm users, we are trying to solve challenge #3 for
the Inventorbot with our new Mindstorm set. This is the challenge to
throw an object. As configured, the speed of the engine is not enough
to actually throw a item (we're using a pingpong ball), but merely
moves the arm up in the air and the ball rolls down the arm. We tried
making a longer arm and that did not help.

Is there something that we are doing wrong, or is this the extent of
how well the challenge cn be solved?

Thanks,
Biff


Posted by Pete on June 17, 2006, 11:01 pm
Biff wrote:

> This is the challenge to throw an object.

Perhaps the motor doesn't have to provide the motion to throw the ball,
but merely to move the arm to a position where an elastic band or
something similar can provide the throwing force?

Peter

Posted by Daniel W. Mathiasen on June 18, 2006, 6:10 am
Hi,

I would look into two scenarios to throw objects. Elasticsbands as
suggested, or extreem gear - personally I prefer the gearing - though
elastic bands does provide for amazing results too.

Good luck with it,

Daniel


Posted by Robot Fan on June 30, 2006, 11:25 am

Biff wrote:
> As brand new Mindstorm users, we are trying to solve challenge #3 for
> the Inventorbot with our new Mindstorm set. This is the challenge to
> throw an object. As configured, the speed of the engine is not enough
> to actually throw a item (we're using a pingpong ball), but merely
> moves the arm up in the air and the ball rolls down the arm. We tried
> making a longer arm and that did not help.
> Is there something that we are doing wrong, or is this the extent of
> how well the challenge cn be solved?
> Thanks,
> Biff

You can setup a rachet and each turn of the motor tightens up a rubber
band. When you release the rachet, wheeeeeeeeeeeeeeeeeeee.....



Posted by Robot Fan on June 30, 2006, 2:38 pm

Robot Fan wrote:
> Biff wrote:
> > As brand new Mindstorm users, we are trying to solve challenge #3 for
> > the Inventorbot with our new Mindstorm set. This is the challenge to
> > throw an object. As configured, the speed of the engine is not enough
> > to actually throw a item (we're using a pingpong ball), but merely
> > moves the arm up in the air and the ball rolls down the arm. We tried
> > making a longer arm and that did not help.
> > Is there something that we are doing wrong, or is this the extent of
> > how well the challenge cn be solved?
> > Thanks,
> > Biff
> You can setup a rachet and each turn of the motor tightens up a rubber
> band. When you release the rachet, wheeeeeeeeeeeeeeeeeeee.....

Just in case you ask:

Use a floating worm gear to control the setup. When you rotate
forward, it tightens up the rubber band. When you rotate backwards, it
releases the rachet. :=)


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