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So measure not by the masses, but by the sparks that you generate. - Kims Robot [more] |
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A very crude crab drive idea I had, for the sole purpose of trying to explain a very basic concept in my quest to pursue crab as a future drive train.
Discussion
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22-06-2009 17:38
dodar
Re: pic: Crude Crab
Just saying, but the motor on the module that is drawn for the wheel is improbable. its pointing down and then you have chain going down from it
22-06-2009 18:42
Katie_UPS
Re: pic: Crude Crab
It really is just an idea of a motor/gearbox/chain combo. I could've drawn more axels, but I was going to use this to explain my ideas in a thread a few days ago, forgetting that it takes a while for pictures to get through.
22-06-2009 18:52
ttldomination
Re: pic: Crude Crab
Just...as another FYI, the things that run the chain are called sprockets...not gears. 
.
Other than that...looks good.
22-06-2009 19:03
Katie_UPS
Re: pic: Crude Crab
Again, to restate because you guys missed it the first time, this is a rough drawing. I understand all of the components that would go into my little sketch. I was trying to convey a very basic idea. If you have anymore feedback upon the details, reread my posts before you comment.
22-06-2009 21:38
ttldomination
Re: pic: Crude Crab
Sorry about the whole sprocket thing, but I meant it as a joke.
I looked back at it again and the only problem I potentially forsee in this particular design is that it might not be usable in competition. If your intake system needs an opening on one side of the chassis, then having chain that wraps all the around will not work, but then again, that really depends on the year's game.
You might wanna try a system where each side turns independently.
22-06-2009 21:42
Aren_Hill
Re: pic: Crude Crab
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Originally Posted by ttldomination
Sorry about the whole sprocket thing, but I meant it as a joke.
If your intake system needs an opening on one side of the chassis, then having chain that wraps all the around will not work, |
All 3 swerves we've made (1625) have had this steering chain setup, 1 big loop.
(prototype 07 and 08)
22-06-2009 21:43
R.C.
Re: pic: Crude Crab
BTW, you don't have to use Solidworks or Inventor to get ideas out. You might want to look into 3ds Max (comes in the kit), Paint (pre-installed on windows), or even google sketch up. Our team use to do that when we had ideas. It helps to see ideas more organized. Plus Paint is pretty simple to use.
Great Sketch,
-RC
22-06-2009 22:29
BrendanB
Re: pic: Crude Crab
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Originally Posted by ttldomination
Sorry about the whole sprocket thing, but I meant it as a joke.
I looked back at it again and the only problem I potentially forsee in this particular design is that it might not be usable in competition. If your intake system needs an opening on one side of the chassis, then having chain that wraps all the around will not work, but then again, that really depends on the year's game. You might wanna try a system where each side turns independently. |
However I do agree that it might be a good idea to rig the two pod sides together to help save weight and complexity.
23-06-2009 12:12
daltore
Re: pic: Crude Crab
You don't have to have every module chained to two other modules. For the explanation, I'm going to use FL, FR, BL, and BR for front left, front right, back left and back right, so just a heads up.
If you have the opening in the front and the motor in the middle of the back, you have the motor directly chained to BL and BR. Then BL is chained to FL and BR is chained to FR. That's 4 segments of chain. FL and FR are not chained together, which leaves the entire front part of the robot between the wheels open, and you still get single-motor-steering crab drive.
23-06-2009 12:26
Lowfategg
Re: pic: Crude Crab
If you go with a single chain run all the way around you will not have enough chain wrap on the steering motor to transfer loads properly. You could get around this with a few idler sprockets but I would just move the steering motor more inboard to gain more wrap.
23-06-2009 13:28
Francis-134
Re: pic: Crude Crab
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Originally Posted by BrendanB
Actually, you can have all of the pods hooked up AND have an intake. On the side in which you desire to have the intake your shafts will need to be extended to clear the intake and then the chain can run across the divide. Correct me if I am wrong, I believe that Trinity team 40 had their chain drive over their intake.
However I do agree that it might be a good idea to rig the two pod sides together to help save weight and complexity. |
Conversely, 190's robot's chain path comes around the collector at the front of the robot (imagine a big "[" around the collector). We have had no problems with the steering motors or chain path all year. Be advised your mileage may vary.
23-06-2009 17:00
AndyB
Re: pic: Crude Crab
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Originally Posted by dodar
Just saying, but the motor on the module that is drawn for the wheel is improbable. its pointing down and then you have chain going down from it
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26-06-2009 12:45
Renee Becker-Blau
Re: pic: Crude Crab
Keep the picture and the comments and put them in your binder, maybe we can work on building one in the pre-season. Thank's for the input guys.
26-06-2009 13:19
AndyB
Re: pic: Crude Crab
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Originally Posted by Littleswimmer14
Keep the picture and the comments and put them in your binder, maybe we can work on building one in the pre-season. Thank's for the input guys.
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26-06-2009 13:41
Aren_Hill
Re: pic: Crude Crab
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Originally Posted by AndyB
Renee, if you guys need any help with designing/building a crab drive (aside from Kevin, who should have some experience in the matter) give me a call and I can either help you, or set you up with someone who can.
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