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PL Series
PCD/CVD PRODUCTION
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Planetary Lapping Machines for PCD

Coborn’s planetary lapping machines are designed to polish the top surface of PCD discs to a flat, mirror finish. They can also be used to polish CVD discs and PcBN.

The machine consists of a number of independent work heads which hold the discs against a large, horizontally mounted planetary motion grinding wheel.

It is impossible to use flood cooling when polishing large areas of PCD as the discs ‘aqua-plane’ on the wheel surface. Therefore, the lapping is a dry process and the wheel is internally cooled using water from an associated water chiller.

Chilled water is also fed to the back of each disc. This maintains the disc at a uniform temperature to minimise disc dishing.

The PL4 is equipped with 4 work heads and a fifth work head can be fitted as an optional extra.

The larger PL5 is equipped with 6 work heads as standard.

Each arm is fitted with a double gimbal fixture to allow the disc to self-level. The disc holders are motor driven.

The lapping pressure can be individually adjusted.

PL4
Machine dimensions (w x d x h):
690mm x 1,020mm x 1,625mm
Machine weight: 550kg
Main spindle: 12.0 kW
Chiller capacity: 5.5kW
Fixtures: 4 as standard
Wheel: Diameter 300mm, Face 45mm

PL5
Machine dimensions (w x d x h):
790mm x 1,150mm x 1,625mm
Machine weight: 590kg
Main spindle: 12.0 kW
Chiller capacity: 7.5kW
Fixtures: 6 as standard
Wheel: Diameter 400mm, Face 105mm

Technical Details

Characteristic PL4 PL5
MACHINE
- Machine type Planetary lapping machine Planetary lapping machine
- Dimensions (w x d x h) 690mm x 1020mm x 1625mm 790mm x 1150 x 1625mm
- Total machine weight 550kg 590kg
SPINDLE
- Spindle type Coborn precision spindle Coborn precision spindle
- Main spindle power 12.0kW 12.0kW
PLANETARY WHEEL MOTION
- Planetary wheel motion Variable stroke between 9.5mm and 22mm in
24-0.5mm steps
Variable stroke between 9.5mm and 22mm in
24-0.5mm steps
POLISHING STATION FIXTURES (ARMS)
- Number of fixtures 4 as standard (5 possible) 6 as standard
- Motorised drive to disc holders Yes Yes
- Self levelling disc holders (gimbals) Yes- double gimbal Yes - double gimbal
- Water cooling to disc holders Yes Yes
- Independent timers Yes - one Yes - one
- Polishing pressure Individually adjustable Individually adjustable
- Maximum load per station 56kg as standard (128kg on request) 56kg as standard (128kg on request)
- Maximum permissible total load (all stations) 250kg 300kg
- Maximum disc size 45mm PCD on 45mm wheel 100mm PCD on 105mm wheel
WHEEL
- Wheel diameter 300mm 400mm
- Wheel face width 45mm or as requested 105mm or as requested
CHILLER
- Capacity 5.5kW 7.5kW
- Chiller dimensions (w x d x h) 715mm x 715mm x 1375mm 715mm x 715mm x 1375mm
- Chiller weight 180kg 190kg
ELECTRICAL REQUIREMENTS
- Electrical Requirements 3 phase, 415v or 220v 3 phase, 415v or 220v


OPTIONAL EXTRAS APPLICABLE
1. Additional polishing fixture (arm) Applicable (factory fitted) Not applicable
2. Grinding wheels Available - size & grade on request Available - size & grade on request
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Chesham Close, Cedar Road, Romford, Essex RM7 7PJ, UK
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