Diamond drill bits
Diamond drilling is the most productive method of making a hole in friable, hard, nonmetallic materials. The most com monly used in industry are tubular drills consisting of a diamond rim crown, fixed in a cylindrical core (drill end). These tools take off material only on the rim surface. Usage of drills of this type helps to reduce axial load and to ease coolant supply to the cutting area. It provides high productivity and quality of processing and decreases diamond expenses. Recommended rotational frequency index of drills for glass drilling Drill diameter, mm Rotational frequency, RPM Mechanical feeding, mm/min 1 — 3 6 000 — 24 000 20 — 50 3 — 6 3 000 — 12 000 ...