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this is basicly what we hope to do. we are going to dive fast and have the claw to hold the ball while we drive
Discussion
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06-02-2008 14:45
samboydh
Re: pic: Its almost done
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Originally Posted by Andy L
Will you use PVC in the final??
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06-02-2008 14:56
Laaba 80
Re: pic: Its almost done
| This is basicly what we hope to do. we are going to dive fast and have the claw to hold the ball while we drive |
Joey
06-02-2008 15:07
DanDon
Re: pic: Its almost done
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Originally Posted by Laaba 80
You do know you cant be touching the ball as the robot crosses your finish line right? If the ball if in contact with your robot while crossing you dont get the 2 points for the ball, just the 2 points for the robot. It needs to have some way to let it go easily.
Joey |
06-02-2008 16:09
Urban Hawk
Re: pic: Its almost done
you might want to consider something a little stronger then PVC pipe fixtures. We used some last year and it snapped like toothpicks.
Our team moved to copper fixtures this year, they don't weigh to much more and they are strong as hell.
You also have to worry about getting tangled up with other robots. It could become a large tangling hazard if it drops on top of aother robot. Says somewhere in the rules that that's not allowed. you might want to reconsider that.
06-02-2008 16:54
vivek16
Re: pic: Its almost done
maybe you guys could try thin walled (1/16"?) aluminum tubing that is round and use that?
I understand that pvc is very, very easy to build with. At any rate, good luck. 
-Vivek
06-02-2008 19:27
doukjin
Re: pic: Its almost done
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Originally Posted by samboydh
ya. we are worryed about weight
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you might want to use PVC Cement to give the structure rigidity at the connecting joints without screws [might also alleviate weight]
06-02-2008 21:41
s_forbes
Re: pic: Its almost done
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Originally Posted by doukjin
i see you're using screws... by the looks of it
you might want to use PVC Cement to give the structure rigidity at the connecting joints without screws [might also alleviate weight] |
06-02-2008 23:11
Ben Piecuch
Re: pic: Its almost done
Wait, are you guys saying that we shouldn't build our robot with PVC? It's too fragile, it's too weak, it'll break? Maybe we should redesign our robot then. Oh, I'll let Bill Beatty from Team 71 know too. I think they have a couple national championship robots that used a whole lot of PVC...
When used properly, PVC is an extremely light, strong, compliant (and cheap!) material for use on a FIRST robot. I have seen a lot of PVC parts bend at some extreme angles, and return to their original shape. Aluminum parts don't seem to like such usage.
I would recommend the glueing method of attachment over the bolts.
Bengineer
06-02-2008 23:19
EricH
Re: pic: Its almost done
Actually...
There is another champion who used PVC for a key part. Don't let the yellow paint on the arm of 330's 2005 robot fool you; it's PVC. And there is nothing wrong with screws; the same robot's gripper was held on with screws. See this picture. Lower right has the connections in question.
06-02-2008 23:41
Joe G.
Re: pic: Its almost done
In my experience, thicker PVC (like that on the robots previously mentioned) is fine, but what they are using (flag-holder-esque thickness) will sometimes have issues when hit. I would reccomend the screws, if for no other reason, replacability. Also, I would have plenty of extra PVC on hand if you stick with it.
Good luck, the design looks great. How fast/controllable is it with those wheels?
07-02-2008 02:37
doukjin
Re: pic: Its almost done
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Originally Posted by Ben Piecuch
Wait, are you guys saying that we shouldn't build our robot with PVC? It's too fragile, it's too weak, it'll break? Maybe we should redesign our robot then. Oh, I'll let Bill Beatty from Team 71 know too. I think they have a couple national championship robots that used a whole lot of PVC...
When used properly, PVC is an extremely light, strong, compliant (and cheap!) material for use on a FIRST robot. I have seen a lot of PVC parts bend at some extreme angles, and return to their original shape. Aluminum parts don't seem to like such usage. I would recommend the glueing method of attachment over the bolts. Bengineer |
yes it is agreed that it is light, very strong for its weight, and cheap [and very good for prototyping], high-speed impact situations such as ones that might possibly occur in this game would not bode well for any arm made of PVC
07-02-2008 08:12
Qbranch
Re: pic: Its almost done
How much does your robot weigh? Do you have any bumper ideas?
How long does it take for your manipulator to capture the ball? Release the ball?
Interesting drivetrain.. do all six wheels drive?
-q
07-02-2008 12:20
1086wulf
Re: pic: Its almost done
i'm guessing from the picture that the claw does not actually grab the ball but contains it? are you planning on running around quick, rolling the ball over the line, grabbing it again, and then repeating? it looks like a good design though i would have doubts about maneuverability in some situations and it looks like your bot would have little torque
07-02-2008 16:29
samboydh
Re: pic: Its almost done
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Originally Posted by Qbranch
How much does your robot weigh? Do you have any bumper ideas?
How long does it take for your manipulator to capture the ball? Release the ball? Interesting drivetrain.. do all six wheels drive? -q |
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