A. From Machine or EDM working surface to Mirror :
1. Use Alumina Grinding wheel or Polishing stone WA400# remove all machining surface
2. Use oil stone polishing step by step :
180#—240#—320#—400#—600#—800#—1000# (800# Commonly used for correction surface flatness avoid the subsequent polishing prone to ripple
3. Use Silicon carbide sand paper polishing step by step
400#—600#—800#—1000#—1200#—1500#—2000# (Pre-hardened steel is not recommended to polishing by 1500# sand paper ,To prevent the surface from overheating)
4. Gum use wood (soft) —6um, 3um, :Wool Felt—1um Use100% Cotton & Diamond paste Polishing ;
(9um (1800#) —6um (3000#) —3um (8000#) —1um (14000#) For finer polishing: 1/2um (60000#) 1/4um (100000#) , Please ensure that in a dust-free environment)