... promptly:When you engraving different hard stone , please change your machine parameters as follows:1,NormalJoyFeedrate:1800-50002,RapidJoyFeedrate: ... True6,ZDownFeedrate:500-20......More Parameters for CNC Engraving Machine, Please contact me by online chat tool trademanager ... Why Select LONGXIANG Tool??? (1) We can operate CNC Router Machine . (2) We can use Artcam , NCstudio ,Wentai, JDPaint ...