Team 166 Grabber Prototype
 

I finally got around to filming our grabber in action. The grabber is made out of lexan and has plaction material for grippiness, it is powered by pneumatics.
Here is the original prototype videos:
http://www.youtube.com/watch?v=3pSTa-hIan8
http://www.youtube.com/watch?v=cAlQZYa1MC0
Here are the videos of the revised prototype with the plaction material attached with pop rivets instead of duck tape:
http://www.youtube.com/watch?v=rdsfjRpi-oo
http://www.youtube.com/watch?v=KsDgA-p6D90
http://www.youtube.com/watch?v=_ISXs36b15I
http://www.youtube.com/watch?v=qT4HOJYNQus

Re: Team 166 Grabber Prototype
 

Good design, two questions, have you tried mounting it on an arm and scoring with it? and any reason you went with a claw?

Re: Team 166 Grabber Prototype
 

well... 1. its going on an arm on an elevator we don't have built yet because were waiting on things from 80/20. 2. we were going to do an internal expansion gripper that gripped the inside of the tube. one of our senior team members didn't like that, 2 hours later he came back with this prototype that worked really well so were just going with it, and the other reason is we had a claw that worked well in 2007, this ones just going to be lighter.

Re: Team 166 Grabber Prototype
 

so we may test it on our GemAtlas Protobot today. We essentially resurrected one of our 2007 chassis using new electronics, the chassis also has prototype components for our 2008 robot so we have a arm we could test it with. I'll have to see what our mech lead thinks...
GemAtlas Protobot Test vids:
http://www.youtube.com/watch?v=9LUNDm1TJqc
http://www.youtube.com/watch?v=613LSX-FPBA
http://www.youtube.com/watch?v=UnuCNtgqsTo

Re: Team 166 Grabber Prototype
 

so we didn't try the arm on GemAtlas, but we decided that its the design were going with for sure, now we're just waiting on 80/20 parts.

Re: Team 166 Grabber Prototype
 

HOLLY SHYT !!!!! can i knoe how u guys are manipulating hand's (clasw's movement).

my team discussed tht we will have 1 part of claw (.-* ) as stationary so it wouldn't move .. tht would be top of the claw.. if u guys have done any testing, can you tell me pros and cons of having the whole claw moving ....

thanks

Re: Team 166 Grabber Prototype
 

I like it a lot. This is a strong year for pinch claws... not quite as wide of a grip as I'd like but it looks like you guys are constantly iterating.

Re: Team 166 Grabber Prototype
 

We have done no testing with both sides, one works just fine. This gripper works great with as little as 31 psi, we cant test any lower because the solenoids we have don't work with less then 30 psi.

Re: Team 166 Grabber Prototype
 

Were planning on having the whole surface on the final gripper covered with plaction material. Today we cut off the plaction that was protruding from the end of the gripper, but that caused us to pop another tube so we'll probably have 1/2 inch to an inch of material coming out the end to prevent this and to assist us in picking up deflated tubes.

Re: Team 166 Grabber Prototype
 

1. It is moved with a pneumatic piston.

2. I thought about moving both "hands" but I decided against it because A.) It would add unneeded complexity and weight. and B) One works just fine.

Re: Team 166 Grabber Prototype
 

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