PG3B - PLANETARY GRINDING MACHINE
Mono Crystal Diamond (MCD) is the term usually used when referring to synthetic single crystals of diamond made by high pressure, high temperature (HPHT) techniques. The crystals are typically slightly yellow rather than white/transparent in colour. These crystals require machines for lapping, grinding and polishing into cutting tools, wire drawing dies, dressers and heat spreaders for example.
The PG3B has air bearings for both the pivot and the water cooled wheel spindle. The machine is designed for making:
• Low or controlled waviness, radius tools
• Multiple facet tools, conical tools
The pivot motion is automatic and controlled via a touchscreen. Pivot angle limits, dwell time at end of stroke and pivot speed can all be pre-set.
If ‘hard’ spots exist on the diamond then temporary pivot limits can be selected whilst running.
Tools are inspected via a VS5G vision system.
Wheel spindle Air bearing
Speed 0 – 12,000 rpm
Spindle direction Clockwise and Anti-clockwise
Spindle tilt 0 – 20 degrees
Stroke length 0 – 28 mm
Pivot spindle Air bearing
Pivot range 182 degrees (+/- 91 deg)
Planetary motion Continuous/jog
Planetary direction Clockwise and Anti-clockwise
Maximum radius 75 mm
Conical clearance 0-20 degrees
Cylindrical clearance 0-20 degrees
Rotary fixture – CF13
Metal bond or cast iron laps
• Main controls sited off the machine to minimize
• Automatic pivot motion
• Variable lapping load 0.5 – 3 kg
• Precision ‘place’ and ‘lift’ mechanism
• Tool inspection by vision system
• In-feed precision 0.1 μm
• Digital pivot angle display
• Synthetic granite base
• Metric or imperial versions
• Remote diagnosis over internet