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#1
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Re: pic: 1625's shooter ready to fire
Quote:
this mechanism never gave us a problem during the whole season, very easy to maintain (also i came up with this linkage concept 4 years ago playing with legos....) Last edited by Aren_Hill : 23-05-2008 at 00:47. |
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#2
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Re: pic: 1625's shooter ready to fire
What is that giant heatsink on?
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#3
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Re: pic: 1625's shooter ready to fire
the FP motor that steers the wheels, it actually helps for when the bots running for more than 2 minutes.
Leav, look at the next picture of our shooter and you'll get a better idea how it works, its kinda tough to do with words. We wanted to accomplish a punching mechanism without having any other actuation, as we've never used pneumatics once in our 4 years and another motor is more weight. Last edited by Aren_Hill : 23-05-2008 at 12:03. |
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#4
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Re: pic: 1625's shooter ready to fire
Are there any safety features on it?
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#5
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Re: pic: 1625's shooter ready to fire
it doesn't move if we don't tell it to, by leaving the anti-backdrive pins in the dewalt. And if it dry fires nothing goes flying. It only is able to shoot when in the correct firing position. besides that we just used our "don't be stupid" policy and it hasn't gotten anywhere near to harming anything
Last edited by Aren_Hill : 23-05-2008 at 15:36. |
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#6
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Re: pic: 1625's shooter ready to fire
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You use a crab drive right? Last edited by Andrew141WOBOT : 23-05-2008 at 18:37. |
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#7
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Re: pic: 1625's shooter ready to fire
you'd have to apply ALOT of downwards force on the linkage arms in order to fire it "accidentally". And yes we've got a 2 speed swerve drive
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#8
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Re: pic: 1625's shooter ready to fire
okay, heres how this thing works. In this picture the shooter is currently ready to fire.
there are two linkages, one hinged to the puncher itself and one hinged to the large sprocket, then connected together. Currently the forward force of the surgical tubing is holding the linkage quite tightly against a catch on the face of the sprocket. In order to fire the large sprocket rotates, moving the hinge point of the rear linkage over center and therefore there is no catch to stop the puncher from flying forward, hence it flies forward. this leaves the shooter in "unloaded position but both linkages fully outstretched. The large sprocket then rotates the same direction it did to fire, drawing back the rear hinge point hence partially loading the shooter. Then once the hinge point 180deg from where it was the catch grabs the linkage and it does another 170deg rotation, to be back ready to fire. i hope thats not to confusing, i managed to explain it to people in person but alot of talking with the hands was involved ![]() |
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#9
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Re: pic: 1625's shooter ready to fire
That shooter is very impressive. I watched you guys in some of your matches and I extremely impressed. I know this thread is about your shooter, but your drive train is incredibly cool as well. Do you have any pictures or CAD models that you can post of the drive train?
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#10
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Re: pic: 1625's shooter ready to fire
Quote:
Single Module Corner of robot focusing on a module |
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#11
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Re: pic: 1625's shooter ready to fire
So, from where we are looking, the sprocket rotates counter-clockwise, the metal semi-circle that is attached to the sprocket hooks the bolt connecting the two bars and draws them back?
That's pretty neat. I like how this is all accomplished without pneumatics. |
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#12
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Re: pic: 1625's shooter ready to fire
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The aluminum bolted to the sprocket is just to give the linkage a flat plane to slide on. |
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