... accurate instrument app-aratus processing.3.Features:Good at processing small hardness work-pieces, multi-speed adjustment, the speed of engraving curve ... steel chest-brand,copper stamps,jade stamps,marking on the work-pieces,copper electrodes,punching moulds and thermos dies,etc. Model ... , G-CODEBall screw:Rolling ball screw from GermanyResolution:0.01mm Small precision wood cnc router