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| | AIR BEARING OPTICAL POLISHING MACHINE | |
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| | Yokeforworkhoiderring show ing positive drive to roller bar bearing, and reciprocating drive housedbeiow work tabfe surface. | O The Lapmaster 48 air bearing optical polishing machine is designed for production of large area high quality piano optics, or where high outputs are required. O The machine has a 48 inch (1219mm) optical pitch annular iap, and three work stations that can be reciprocated. O As with other machines in the series, unlike conventional so called "worm and wheel" polishers, the pitch lap spindle is not mounted on a mechanical reduction gearbox. The unique air bearing feature has the pitch lap and its support plate riding on a very thin cushion of com pressed air. This gap is only a few thousandths of an inch wide. O Drive is from an electric motor via a lay shaft, and is transferred to the lap using a multi vee drive belt located on the periphery of the support plate. O This approach considerably reduces the vibration at the polishing surface. FEATURES AND TECHNICAL SPECIFICATIONS PITCH LAP O The pitch lap is manufactured and cast by Lapmaster International to suit the requirments of the customer. This is specified by measuring the pitch hardness using the Twyman penetration test. Various groove pat terns can be cut, most commonly concentric grooves, but cross hatched or diamond patterns may be speciied. O The depth of pitch is approximately 2 inches (50mm). Externally it is O retained by an aluminium band, internally a stack of removable micart-., rings is used. A full pitch lap recasting service is offered by Lapmaster m International. L 4 8 | |
| | Conditioning weight in position on lap. | |
| | Workholder ring & working face of conditioning weight. | |
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