Metric five-start thread on copper.
My first experience with copper lathe. Crafty enough metal. But I managed to carve difficult parts out of copper for a future homemade mini-vacuum cleaner on batteries. The result is copper contacts for a homemade battery.
Copper cutter: http://ali.pub/4kvnx2
Carbide insert (non-ferrous metals): http://ali.pub/4kvofc
