Skateboard-bearing motor commutators

A simple and effecient way to time pulsing into motor coils through a brush contacting rotating bearings.
Conductive grease can be used inside bearings too, in order to imporve conductivity.
I found the best contact-brush material is silicon rubber coated "noodle" hook-up wire that they sell in hobby stores which is commonly used to hook up the battery supply to the electric motors in radio controlled airplanes and cars.
It can handle an amazing amount of amps for its size and thickness,and is made of many fine strands of special conducitve wire.
I have not found anything better to make contact with the roller bearing commutators and send current into motor coils,