DC Motor wheel - with or without gears?

[itmth19]

I'm going to design the car robot wheel mechanics, and I have some questions regarding the picture above.
- I have one set of 2 motors and some gears. when making robot like micro-mouse or running robot with mapping feature, should I use motors with gears in set like in the picture above, or the way of connect the motor directly to the wheel would be better?

- I saw the Radius of the axle of the motor is little bit smaller than the axle that goes with the wheel? which way I could overcome this?

thanks all

[Eithman]

It depends on how permanent, strong, and professional you want the robot to be. As for the gearing, I would suggest using the gears because the motor itself has very low torque and depending on your robots size, probably will not be able to move. The wheel diameter problem could easily be solved with some super glue if you wont mind if being stuck on the axle forever. A more temporary solution would be to use duct tape. Again, that all depends on how professional you want the robot to look and how permanent you want it to be. If you want it to look good and be able to take it apart when you are done, I would suggest buying a set of wheels on the internet that fit correctly. Good luck! Let me know if you have any other questions!

[itmth19]

Ok I got it. Presently I tried mounting the two DC motors with 2 separate wheels and it worlds well. I got a set of wheels kit and it's great. The only problem is it's always hard for me to measure the DC motors velocity, I know some methods for them such as IR sensors or using servos instead. Nevertheless, they's great now.

Thanks for your help.