How to make high quality carbon brush?

How to make high quality carbon brush

 

First, Cutting and molding a large piece of carbon materials.

 

Second,There have two kinds of , one is include spring, another  is without spring.

 

The carbon brush with spring is cylindrical hole;Without spring is the drill hole;

 

 

Third,the AUTO - CUT automatically jump stop.The carbon brush with spring , drill a small hole manually and put in a small spring on the bottom of the carbon brush on the view of front.
The carbon brush Without spring, drill a hole again next to the second round hole, put into a circular copper sheet and adding copper powder to compact

 

 

 

Fourth,Put into carbon braid

 

 

Fifth,In order to increase smoothness and reduce spark Produced in the process of making , soaking into aviation gas oil , then dry natural

 

Sixth,Add the copper joint or spring + welding copper connectors

 

finished product brighter than before because they soaked in oil