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pic: FRC488 - 80/20 Drive Train
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Re: pic: FRC488 - 80/20 Drive Train
Looks solid. Do you have an estimate of what it wieghs in it's current design state? Also the question I really have is are you using two servos to shift the dewalts, if so have you done any testing with it?
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Re: pic: FRC488 - 80/20 Drive Train
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We had some trouble shifting the DeWalt gearboxes with a single servo last season, so we've been thinking about adding the second to each. We haven't tried it yet. |
Re: pic: FRC488 - 80/20 Drive Train
How are the bearing blocks held in place on the 80-20? Other then that it looks like s very good simple drivetrain. I guess you didn't see a need for the second set of cims last season?
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Re: pic: FRC488 - 80/20 Drive Train
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We had some trouble shifting the Dewalts and made no use of 3rd gear last year, so we were a bit slower than I'd hoped. As always, the game may change what we put into the drive, but if we can avoid pushing matches again, we'll probably stick with 1 CIM per side. Similarly, it's shown with four traction wheels, but we may again use just two and put omniwheels back onto the corners. We expect to have our hands full with the new cRio system, so anywhere else that we can remove complexity, we'll do it. |
Re: pic: FRC488 - 80/20 Drive Train
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Thats just my opinion. :P |
Re: pic: FRC488 - 80/20 Drive Train
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We haven't used 80/20 much, but have had success with it staying where we put it as long as the bolts are properly tightened. |
Re: pic: FRC488 - 80/20 Drive Train
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Re: pic: FRC488 - 80/20 Drive Train
Madison, this looks like a very simple, easy to put together design.
The only weaknesses are, in my eyes, angular clearance for ramps. Assuming the wheels are centered at 3/4" above the 8020, and positioned about 3.5" back from the inside of the front rail, that only gives you about 17 degrees of angular clearance. But for a flat-field application, this looks like a very nice drive that you could easily modify at any point. |
Re: pic: FRC488 - 80/20 Drive Train
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Andy |
Re: pic: FRC488 - 80/20 Drive Train
Why do you need a six wheel robot if you are using omni's? also watch out, 8020 bots get heavy, fast. on our 2006 robot we essentially built our entire robot out of 8020. There is alot of un necessary weight in 8020. Do you really need all for slots in the metal? it is very strong and is very fast, so if your going for a fast build this is what you want. Also, what size 8020 are you using, the inch or half inch?
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Re: pic: FRC488 - 80/20 Drive Train
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Re: pic: FRC488 - 80/20 Drive Train
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The profile shown is 1010 -- 1" square. We have a good history of building reliable drive trains that are also very light. We've been working lately on minimizing manufacturing time, so we're conceding some of the features that make things light in favor of those that make them quick to build. Quote:
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Re: pic: FRC488 - 80/20 Drive Train
Our base was almost exactly like this last year and we had a few problems because the middle wheel was more dragging than helping
We removed it for Cal Games this year and it made a noticeable change when driving, but other changes we made to the robot made it hard to actually compare. |
Re: pic: FRC488 - 80/20 Drive Train
Great design, you could build that whole thing in a day! Well, except for the transmissions... I like how you completely eliminated the need for any tensioning device with the use of 80/20, very clever. The only "problem" I can see with it is the lack of any diagonal bracing, but I suspect the electronics board or the top half of the robot will account for that. I doubt that you'd let anything like that slip by.
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