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  #16   Spotlight this post!  
Unread 23-01-2011, 23:20
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Re: pic: Our best 2011 robot design

Reminds me of 114 from 2007. Very neat looking mechanism, hope you can pull it off!
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Unread 24-01-2011, 11:39
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Re: pic: Our best 2011 robot design

VERY similar to an idea 2791 was kicking around before the 60" rule change. I would recommend you use a very, very heavy duty hinge for that joint.
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Unread 24-01-2011, 15:34
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Re: pic: Our best 2011 robot design

1276 built a similar hinged mast in our 2007 robot.

That joint needs to be beefy. As you can see we had a circular mast, and welded on square tubing which is where the joint actuated. There were also a set of guides inside the mast that helped guide it down.

It worked, but not nearly well enough. Our piano hinge was purchased at a hardware store, and was not up the rigors of competition. I don't remember the diameter of the pin in the hinge, but it was somewhere around 1/8" and the hinge ran the entire length of box tubing. We actuated it on Thursday (it was pushed up by the elevator), but ultimately we were not comfortable with leaving it that way during matches, so we bolted it upright and were a 6' tall robot (which was legal in 2007). As others have mentioned, you get quite a lot of torsion (twisting) and some pretty sever shockloads when it slams down if you are not careful. Also give some consideration on how it will be held in place once it actuates up... don't want it coming down mid match!

McMaster sells much beefier piano hinges than what we used, I would recommend using them. Go as thick as you can without paying out the nose.
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Unread 24-01-2011, 15:35
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Re: pic: Our best 2011 robot design

Just one question... are you tilting the tower back to keep your end effector inside the robot at the beginning of the match?

I am sure you know it can't start outside the frame perimeter...

Interesting design... Hope it works for you..
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Unread 25-01-2011, 00:49
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Re: pic: Our best 2011 robot design

I love this design, these nearly 10 foot rails are super fun! We had a lot of success with our design in 2007, seeding 1st at SVR with the second highest OPR. Also, these designs can be very light if made correctly.

Make that hinge STRONG! I would actually recommend making your own joint with some beefy 3/8 to 1/2 inch shaft and bronze bushings. Also, you will need a locking system of some sort since the pneumatic pressure alone (assuming this is how you will deploy the upper segment) will not be enough to keep it straight (and thus the rail joint smooth) if it the robot rocks back and forth.

Also, keep the tower in an inch or two from the edge of the robot frame, this gives you more flexibility in beefing up the tower.

Third, make the grabber rail taller so the torque from the grabber mass + gravity is distributed better.

This is all I got for now, feel free to ask more questions if you have any. I loved Rack'n'Roll, glad we get to play it again! Good luck!
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