Using your Edger...Points to remember
Lens
Diameter of uncut lens before edging = diameter of 80 mm plus 10 mm of
maximum eccentricity, i.e. a diameter of 100 mm without decentering.
Thicknesses
Maximum thickness at the edge of the uncut (plastic) lens = 18 mm
Maximum thickness at the edge of the uncut (mineral) lens = 16 mm
Minimum thickness at the centre of the uncut lens = 1.2 mm.
If the thickness of the finished lens (rimless finishing) detected during lens
feeling > 11 mm (17 mm for bevel finishing on a plastic lens - 15 mm for bevel
finishing on a mineral lens), edging is impossible
Shape
Minimum height of the shape in rimless = 17.50 mm
Minimum height of the shape in bevel = 19.10 mm.
Minimum lifespan of the edging wheels:
Mineral roughing = 10000 lenses
Plastic roughing = 50000 lenses
Finishing = 8000 lenses - 10000 lenses
Polishing = 6000 lenses
Safety-bevel = 5,000 lenses per wheel side
Grooving = 5000 lens
Beveling
Minimum lens thickness to produce the type of bevel desired = 2 mm
If maximum thickness of felt lens less than 2 mm, the bevel is automatically type
1/2 - 1/2.
Grooving
Minimum/maximum width = 0.6 to 1.2 mm
Minimum/maximum depth = 0 to 0.8 mm.
Min. distance between the front face of the lens and the front edge of
the groove (or rear face and rear edge) to make a groove = 0.2 mm
Drilling
Minimum hole diameter = diameter of the mill bit, i.e. 1 mm
Lifespan of the mill bit = 1 hr of total drilling, all lens materials together
Maximum hole depth (= length of the mill bit) = 8 mm
Maximum hole diameter = 10 mm
Angle = 10°
Accuracy of the drilling angle = +/- 1°
Positioning of holes = +/- 0.1 mm
Maximum twenty holes per lens, for all types of holes.
An elongated hole, a countersunk hole or a notch count for two holes.
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