What type of drive train did you make this year?

[Jay TenBrink]

4 knobby pneumatic tires.

4 CIMs and 2 FP motors.
FP has a single gear reduction to match the CIM motor no load speed
Primary drive #25 chain.
Final drive #35 chain
no shifting transmission

[whakojacko]

we have 6 whell 2 speed. and btw 114, congrats on your design award, your very cool crab drive definitely deserved it. Even if the award did mean having a poor frehsmen trip on the cable protector/

[killerofkiller]

heh i miss Holonomic, being one of the few omni drives last year was fun but we didn't see a practicle use for it this year so we went with a 4 tread tank design with a 3 speed trannny powered by 4 cim's. our robot get's arround at about 10 fps in 2nd gear so our 3rd gear might not get it's use lol, it's too bad we didn't use that 12 speed gear box that we had our hands on :evil grin:

[sanddrag]

We made a six motor drive with two speeds and six beautiful wheels.

[Tristan Lall]

Originally Posted by sanddrag

We made a six motor drive with two speeds and six beautiful wheels.

This is the only way to fly.... (Well, swerve drives are nice, too.)

[Biff]

Ball casters at the front. Double kit wheels in the center, (chain in between) single kit wheels at the back. Tank drive. Stock kit transmissions, stock at this point ratios, 4 cims, 9 fps. Water cut sprockets and spacers all around, Machined "hats" to hold the driving sprockets on the transmissions. Shipped and bringing sprockets that if installed will either lower speed to 7fps or raise it to about 11fps. One time change and then off the the scale. We may have to loose a pair of Cims if we can't make weight. Plans at this point to add belting to the center stock wheels. Drove nicely with out the complete arm on, but too much wheel spinning. Turns centered at the place I expected it to.

[Christian D]

Six wheels and 2 speeds (shift on the fly).
btw, i don't think mixing #of wheels w/speeds makes an accurates survey if you want to look at the percentage,

[Jeff K.]

6 Wheels, only 2 powered by the Gearboxes in the KOP. 2 cims per side. We used the conveyor belt material from McMaster Carr on the outside circumference of the wheels in the KOP. We cut it using a jig saw...it was pro lol. And of course we were wearing safety goggles while doing it. We also have two omnis in the front for turning. It worked really well for being that the drive train portion was assembled mostly be freshmen.

[sanddrag]

Originally Posted by Christian D

btw, i don't think mixing #of wheels w/speeds makes an accurates survey if you want to look at the percentage,

I would concurr with that. The survey seems all out of whack. I sure would like to see the two walking robots, the nine two wheeled (skids? balancing?) robots, the 14 robots with a 3+ speed transmission, and the ten robots that are something even beyond all these categories. Also, it looks like roughly 40 people have robots that won't be going anywhere because only about 76 out of 111 have any sort of propulsion unit (1 speed, 2 speed, <2 speed). I'd sure like to see those fourty 50' arms on the stationary bases.

Wow, from the poll results, it looks like we are going to have some killer robots at the regionals. I can't wait!

[Travis Covington]

Each team also has multiple CD posters, so various members of one team might be voting for the same thing making the poll misleading. I too would like to see those things though ;-) How many teams ARE using 3+ speeds, that is SO unnecessary!

[Anthony Kesich]

Well, there was a 2 wheel robot at Sacto. I don't remember whose it was, but it was fairly simple. They had one pneumatic tire on each side but only around 1/4-1/2 inch clearance. They files down all the edges and actually made thier base somewhat like a trapezoid so there were no acute angle touching the ground. It seemed to be surprisingly stable and had an awesome turning radius (read: 0).

-Tony K

[Fritztopher]

We used an omniwheel in each corner (that's four) and then two driven wheels with waffle tread, one in the middle of each side of the frame. We used just two chips, and built our own transmission.

[Drake]

We took the kit transmition and turned our robot into a six (6) wheel drive system, http://sjharobotics.org/media/pictures/100.JPG , that has 4 different speed programmed into the code. We run at 75% our speed without holding any button. We also have 25%, 50%, and 100% speeds. The link to the picture is actually of our robot about two weeks before ship time. We actually traded out one of the motors because it was to loud, but the new one isn't as loud. We can actually program out robot to go even faster, but we drive well at 75%, and have great control as well. At 100% our robot is very fast, and at 125% we fear it is too sensitive, making the robot spin in place if you move the control even a little.

[scott]

447 used a very simple 2 wheel, 2 speed drive train. Just one Chip per side into a AndyMark tranny ( Very Nice Tranny I highly Suggest to Everyone ). Also a Korny Lak 4" Transwheel(OmniWheel) in each corner. This gave us "killa turning", speed, pushing power, and stability needed for a 13' robot, tetra stackin' machine.

[SizzelChest330]

We use 4 CIM Motors driving 6 wheels (6 inch wheel chair wheels)
Lots of power! Center wheels are slightly larger pnematic tires for easier turning and better traction.