Did abit of work today,

Machined a copper bar down to make an electrode for spark eroding a square whole on the drive shaft of the selfwrighter, firstly machined it down to exactly 8mm;



Then milled 4 flats on it to creat a square shaft


Then it got put into the collet of the spark eroder and left over night sparking a square whole 9mm deep into the selfwrighting bar, Decided due to its small size that a square bar drive would be best... especialy as theres alot of tourque going into it and its only holding ali on- didnt want the inside of the ali gettin chewed up.


will update tomorow when its done