VEX Drive Trains 2007

[rswsmay]

Our team has not yet fully decided on a design yet. We are considering various design concepts and are working toward prototyping each one before selecting a final design. We have decided on a multi-speed drive train which we have already built and tested. We are also prototyping an ackerman steering system which we hope will improve drivetrain performance during turning manuvers. We completed some preliminary calculations, worked out the geometry and built 2 prototypes this past weekend. In conjunction with this, we plan to develop a software program to drive the wheels on both sides of the robot (actually all 4 wheels independantly) at the necessary speed to minimize skidding/dragging.

We are also toying with developing a 4 wheel steering system, but have not worked on any of the mechanics for that yet.

[fredliu168]

6 wheel all-purpose wheel gear drive. 1:1 gear ratios on the drive.

[Akash Rastogi]

Originally Posted by fredliu168

6 wheel all-purpose wheel gear drive. 1:1 gear ratios on the drive.

Currently working on that but with 4 wheels. Which tooth gears did you use though?

[alex1699]

i not in vex I'm in FRC and i just so happen to have a vex robot i just figured out how to do swivel drive with one wheel and two omni wheels so now I'm going for two swivels and then the next project will be 4 swivel wheels...

[fredliu168]

Originally Posted by XxMORTteam11xX

Currently working on that but with 4 wheels. Which tooth gears did you use though?

60 tooth, alternating gear/wheel

[shsroboticsclub]

Two speed transmission with a special type of steering, I wont say just yet. oh and four wheels.

[Akash Rastogi]

Anyone plan on de-scoring? Or is anyone already capable of doing so?

[TheOtherGuy]

Originally Posted by XxMORTteam11xX

Anyone plan on de-scoring? Or is anyone already capable of doing so?

Posts or side goals? It is illegal to descore the rings on the posts... unfortunately

[Andrew Bates]

You can also de-score the platforms. However I don't think de-scoring will be a big thing at the regional events. I haven't seen any strategies really using the low goals or the platform for scoring. If the robots can't score on the posts they go to get the goals.

[Laaba 80]

More Robotics participates in a local VEX tournament in the fall to prepare for FRC. The game was to pick marbles out of a pit in the middle, and fill up teeter totters. Our team decided to use an Omni drive so we could be very manuverable. The Omni drive worked very well for what we needed.

[ManicMechanic]

Originally Posted by XxMORTteam11xX

Anyone plan on de-scoring? Or is anyone already capable of doing so?

We can schlerp rings off the movable goal platforms and drop them outside the field, (as well as push them out of the side goals), but it's unlikely that we would do so. In a tight match, we can score as quickly as de-score, and you get more rank points by playing offensive than defensive. In an unbalanced match, it might even be worthwhile to score some points for the other team (or at least let them have the movable goals).

[Andrew Bates]

Originally Posted by ManicMechanic

In an unbalanced match, it might even be worthwhile to score some points for the other team (or at least let them have the movable goals).

Silly RP

[Joe G.]

We're using 6WD with 4 1:1 all purpose wheels, and 2 front large omniwheels. I'll put up pics as soon as I can.

[1086VEX]

team 93 is using a 6WD with 4 inch wheels, the two back ones are powerd with a 60-36 gear ration and unpowered large omnis in the front... we will probably be working on a more complex one for our next regional

[Jeff K.]

Team 85 had 8wd with shaftdrive and 2 omnis in the front. It was all the small wheels.