اندازه توپ معمولی از آسیاب گلوله
Guerrilla guide to CNC machining, mold making ... - Michal Zalewski. Right now, the real-world accuracy of a $2,000 mill is usually difficult to replicate ... process takes between 5 minutes and 3 hours on a medium size CNC mill. ..... better during normal work; more expensive units with ball screws and servo motors will ..... may offer low-level motor calibration settings), but it's not a ...