Hi
I want to use some of Pololu’s great products for a swarm of robots that I am planning to build for my final year project. I want to use Pololu’s smallest wheels (32x7mm) with micro metal gearmotors mounted on a PCB. If I understand correctly, pololu item #957 (“Replacement 3pi Ball Caster with 1/2” Plastic Ball") is the apt ball caster to use for this configuration. However, it is vague from the description how the ball caster is being kept in place. If I understand correctly, the ball caster has to be placed through a 600 mils hole in the PCB, but what prevents it from falling through? Does the ball increase the diameter of the holder to prevent it from falling through? Also, in the description of the product, what is meant by “[it] has a side that is flattened by 30 mils”?
With a standard PCB thickness, Pololu’s micro gear motors and 32mm wheels, what will be the distance between the bottom of the PCB and the ground? Some rough calculations led me to about 9mm.
Are two 50:1 micro MP motors excited at 6V a suitable choice to drive a small (3pi’s size or even smaller) robot at a sane speed?
Thanks for helping!