Robot Arm C

Post by **Jim_R** » Sat Jul 02, 2011 5:26 pm

Discussion for Robot Arm C.

Robot Arm Wiki
2011 Thread

Post by **sachleen** » Tue Sep 06, 2011 8:19 pm

This robotic gripper uses coffee grounds in a balloon and a vacuum to pick up objects of any size or shape. I would really like to see somebody implement this in their device. It'll be slow, but still very neat and looks fairly easy to build. How strong are battery those powered vacuums?

Flavorflav · Post by **Flavorflav** » Wed Sep 07, 2011 8:40 am

sachleen wrote:This robotic gripper uses coffee grounds in a balloon and a vacuum to pick up objects of any size or shape. I would really like to see somebody implement this in their device. It'll be slow, but still very neat and looks fairly easy to build. How strong are battery those powered vacuums?

That is really, really cool.

illusionist · Post by **illusionist** » Wed Sep 07, 2011 3:14 pm

Wow, that's a beautiful piece of engineering...

blazer · Post by **blazer** » Thu Sep 08, 2011 2:23 pm

I keep calculating a maximum score of 93, not 94. Am I missing something?

chalker7 · Post by **chalker7** » Thu Sep 08, 2011 4:43 pm

blazer wrote:Correct me if I am wrong, but I can only calculate a maximum score of 93, not 94 as the rules say. My suspicion is the trial rules were double corrected as the maximum score was raised by one point and the following rule was removed: d. At the end of the run, any item that is completely within the North Zone and not completely supported by one of the Goal Boxes will receive 1 point. Without the 4th D battery scoring one point, the maximum score is 93.

In my printed copy of the rules 7.d is still there, which would still make 94 the maximum number of points available (due to the final D battery sitting on the ground in the North Zone). Is your copy different?

blazer · Post by **blazer** » Thu Sep 08, 2011 4:55 pm

My copy is the same. I guess I just missed it. How many motors do you think the national-winning arm will have?

chalker7 · Post by **chalker7** » Thu Sep 08, 2011 4:58 pm

blazer wrote:It is . I guess I just missed it. How many motors do you think the national-winning arm will have?

Wait, it is different? I'm confused.

I'm expecting the nationals winners to have either 3 or 4 motors.

Post by **harryk** » Thu Sep 08, 2011 5:11 pm

I have an idea for an arm with a single motor; using a complex transmission to direct power to different joints, though I think this would prove to be slow, clunky, fragile, and hard to operate, so you probably wouldn't get full points and the advantage of having one motor wouldn't be reaped

blazer · Post by **blazer** » Thu Sep 08, 2011 5:14 pm

Rule 7d is included.

harryk wrote:I have an idea for an arm with a single motor; using a complex transmission to direct power to different joints, though I think this would prove to be slow, clunky, fragile, and hard to operate, so you probably wouldn't get full points and the advantage of having one motor wouldn't be reaped

Wouldn't you need a second motor to control the transmission?

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