... .frequency spindle cooled by water 3.high precision JD3025 jade and jewelry engraver machine Performance features: 1. This ... processing with high efficiency. 2. Three aixs adopt rolling ball screw, rational structure,stable performance 3.Large power frequency ... which is for engraving cylinder material.Available material: Copper, aluminum, jade, acrylic, double-color plates, organic glass, PVC boards, ...