Weco Edge 550, Manual

Page: 103 / 221

Utilization... Operating range
Edge 580 - Edge 550
3-102
3.6.3.3 L
IMITS RELATED TO THE THICKNESS OF THE LENS
The position of the hole and the strength of the lens to be drilled effect the drilling depth. These two parameters
can cause blind holes which must then be finished manually.
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Thick lenses ( = thickness in the direction of drilling > 8 mm )
For lenses of high thickness and for high drilling radii (distance from centre of block to centre of hole),
it is possible that the maximum drilling length in the drilling direction may be exceeded. This results
in a blind hole.
Exemple : Drilling 30 mm from the blocking centre at 0° in a lens of strength -7 D will produce a
through hole.
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Lenses with high front base
For lenses of high front base and for high drilling radii (distance from centre of block to centre of
hole), it is possible that the mill bit retaining nut may interfere with the lens. If so, the edger
automatically limits the drilling depth to avoid this type of damage to the lens. However the hole may
be blind.
Example : Drilling 19 mm from the blocking centre at 0° in a lens of st7 D will produce a
through hole.
Attention !
Blind hole for lens thickness >
8 mm
The quality of the final job (respect of the gaps, the axis, the diameter and the angle
of drilling) depends on the performance and the quality of all the elements in the chain :
>
the quality of the frame used and its presentation lens ;
>
the use of new Briot blocks and adhesif patches ;
>
correct data entry and adjustment of centering, blocking, edging and drilling of the
lenses.
BRIOT - WECO DOES NOT GUARANTEE THE PERFORMANCE OF THE EDGE 550 IF
THESE BASIC RULES ARE NOT RESPECTED.