Robot Arm C

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Robot Arm C

Postby Jim_R » July 2nd, 2011, 5:26 pm

Discussion for Robot Arm C.

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Re: Robot Arm C

Postby sachleen » September 6th, 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?

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Re: Robot Arm C

Postby Flavorflav » September 7th, 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.

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Re: Robot Arm C

Postby illusionist » September 7th, 2011, 3:14 pm

Wow, that's a beautiful piece of engineering... :shock:
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Re: Robot Arm C

Postby blazer » September 8th, 2011, 2:23 pm

I keep calculating a maximum score of 93, not 94. Am I missing something?
Last edited by blazer on September 8th, 2011, 4:56 pm, edited 1 time in total.
Regionals: 1st Robot Arm, 1st Thermodynamics, 1st Experimental Design, 1st Chem Lab, 2nd Forestry, 4th Gravity Vehicle, 5th Optics
State: 1st Robot Arm, 1st Gravity Vehicle, 1st Optics, 1st Chem Lab, 2nd Experimental Design, 3rd Thermodynamics, 6th Forestry
Nationals: Tie for 1st Robot Arm

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Re: Robot Arm C

Postby chalker7 » September 8th, 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?
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Re: Robot Arm C

Postby blazer » September 8th, 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?
Last edited by blazer on September 8th, 2011, 5:19 pm, edited 1 time in total.
Regionals: 1st Robot Arm, 1st Thermodynamics, 1st Experimental Design, 1st Chem Lab, 2nd Forestry, 4th Gravity Vehicle, 5th Optics
State: 1st Robot Arm, 1st Gravity Vehicle, 1st Optics, 1st Chem Lab, 2nd Experimental Design, 3rd Thermodynamics, 6th Forestry
Nationals: Tie for 1st Robot Arm

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Re: Robot Arm C

Postby chalker7 » September 8th, 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.
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Re: Robot Arm C

Postby harryk » September 8th, 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
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Re: Robot Arm C

Postby blazer » September 8th, 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?
Regionals: 1st Robot Arm, 1st Thermodynamics, 1st Experimental Design, 1st Chem Lab, 2nd Forestry, 4th Gravity Vehicle, 5th Optics
State: 1st Robot Arm, 1st Gravity Vehicle, 1st Optics, 1st Chem Lab, 2nd Experimental Design, 3rd Thermodynamics, 6th Forestry
Nationals: Tie for 1st Robot Arm

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Re: Robot Arm C

Postby illusionist » September 8th, 2011, 6:24 pm

I don not have the rules yet, so are we allowed to use autonomous robots, or is it human-electronic control only?
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Re: Robot Arm C

Postby harryk » September 8th, 2011, 6:42 pm

blazer wrote: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?

You manually control the transmission, as far as I know it should be legal since you're not actually powering the arm, only controlling it
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Re: Robot Arm C

Postby 28 » September 8th, 2011, 9:22 pm

what factor will time play in the scoring/tie brakers?

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Re: Robot Arm C

Postby sachleen » September 8th, 2011, 11:06 pm

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 it always move in the same way every time? Meaning, it would extend forward the same amount as it goes down, and back as it goes up. I fail to see how a single motor could be used to make the arm move in different ways.

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Re: Robot Arm C

Postby twototwenty » September 9th, 2011, 6:15 am

harryk's idea might work if there were two motors, one to power the whole arm and one to switch which piece of the arm the motor was controlling. But to make this type of arm work at all you would need a very high power motor to power the whole arm from one place ( not to metion a very well engineered gear system), and this type of motor would not have enough voltage due to the voltage limits for the competition (unless these limits have been very significantly changed, as I don't ahve the oficial rules yet).


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