Inventor Drawings/Concept sketches

[TheLarr]

For posting of design concepts and inventor drawings of the 2008 robots

[TheLarr]

http://a582.ac-images.myspacecdn.com/images01/115/l_de69b22b839eb0026edd2e071050f4ed.jpg

[hipsterjr]

I think this would be pretty good for getting around corners, but you might catch problems with accuracy in auton.

[DarkFlame145]

very nice Larry

[CraigHickman]

Cute. Personally, I've vowed to stay away from the Kitbot ever since some fun little "tests" I did in the lab with two of them...

Here's an old drive design for you to all look over, as this thread is apparently for that...

http://www.chiefdelphi.com/media/img/a1b/a1b72a23ee31b88548e95574773fa36b_l.jpg

[webchief2008]

Is that just a slider in the front and the four drive wheels in back?

[Jaybee1405]

looks like there's sprockets on the front wheels so all 6 should be powered

unless you're talking about the first robot

[DarkFlame145]

I like the 6 wheels, but it might be hard to turn

[pakratt1991]

Well my original idea involved shooting the ball:yikes: , but there are so many issues with that!

who knows :rolleyes:

[Justin M.]

Here is a design we seen last year that worked very well. This is what we'll be racing around on this year:

http://img257.imageshack.us/img257/4599/renderxw5.jpg

[Ruthless]

are we allowed 6 wheels?

[IndySam]

are we allowed 6 wheels?

You can have as many wheels as you want. 703 had 14 in their drive last year. Do a photo search it was amazing.

[webchief2008]

Is it even possible to use four CIM motors this year because if I remember correctly we were only given 2 in the kit or are we allowed to purchase more so long as they are the same type?

[Justin M.]

Is it even possible to use four CIM motors this year because if I remember correctly we were only given 2 in the kit or are we allowed to purchase more so long as they are the same type?
You're allowed up to 4 CIM motors.

<R59> Additional motors specifically permitted on 2008 FRC ROBOTS include:
All motors, actuators, and servos provided in the 2008 Kit Of Parts......

....One or two additional 2-1/2” CIM motors (part #FR801-001 and/or M4-R0062-12 in addition to those provided in the Kit Of Parts. This means that up to four, and no more, 2-1/2” CIM motors can be used on the ROBOT.

[Ruthless]

are there any main advantages to using 6 not 4 wheels?

[=Martin=Taylor=]

are there any main advantages to using 6 not 4 wheels?

The perfect configuration of wheels for tank-style steering is one wheel at each corner of a square. But because most robots are rectangular, teams solve this issue by using six wheels with the center wheel lowered. As a result the drive train functions as two four wheeled robots - tipping back and forth.

If you try and mount 4 wheels at each corner of the kitbot chassis you will quickly understand what I mean :D

[Justin M.]

The perfect configuration of wheels for tank-style steering is one wheel at each corner of a square. But because most robots are rectangular, teams solve this issue by using six wheels with the center wheel lowered. As a result the drive train functions as two four wheeled robots - tipping back and forth.

If you try and mount 4 wheels at each corner of the kitbot chassis you will quickly understand what I mean :D

Exactly. By lowering the center wheels, you achieve the turning characteristics of a 2WD robot with the drivability and traction of a 4WD robot.

When driving forward, gravity will "push" the robot onto the front wheels, and when driving backward, gravity will "push" the robot onto the rear wheels. But when you turn, in theory, the robot should support itself on it's 2 center wheels only, making turns a breeze.

You can't have too much rocker, or play in the wheels though. Somewhere between 1/4"-1/2" is ideal. Too much can be a problem.

[cdennisxlx2]

Heres our latest :)

http://robo.xlx2.com/08cad/1527chas-armassem1sm.jpg

[379robocatCaine]

has anyone ever considered articulating steering?
or has someone done this before?
they use this in large farm type equipment...
sounds like this type would work good....

what do you think??

[les chortos]

the problem this year with 6 wheel "skid steering" is it is hard to "drive it" around a corner fast . I think car type steering and high speed drifting are the key. If you go 6 sheel skid- you could possibility go with a button to steer you around a left hand turn. - when the button is pressed it runs the outside wheels faster to drive a smooth fast arc around the corner. When a human drives skid steer they generally tend to drive in short herky -jerky straight lines around a corner. I think some of the real good teams will have developed special steering software this year -

don't forget to put the 4 drive motors and battery on the same side in case you tend to tip with a big ball on top. latched in a gripper. and arm device.- that will get tippy a full speed.

how fast are people gearing for on single speed gear boxes- out there.??? 20- 25 ft/sec. one complete lap in 5-7 seconds if driven expertly.

good luck to all

[DarkFlame145]

i really wanted to try a car like steering system this year

[Jaybee1405]

les chortos: We're doing rear wheel drive (4 CIMs, 2 on each wheel through the toughboxes). In the front we have car type steering and we've calculated a min. of 15 fps, which we can likely get up to around 20.

Thats a minimum of 12 points during Hybrid, but it shouldn't be too hard to get 16 or even 20

[Matth3w]

We are a using a robot that drives from the middle, using two middle wheels that skid steer and stumps on the front and back. As soon as i get an image, i will post it

[sayso_411]

U wanna kno what we r planning
Well u will see it at the nationals :)