4. PERFORM A STEP BEVEL
A step bevel is strongly recommended for a high-base sports frame or a safety frame.
The step bevel finishing is active and available only if the tool is installed on the “small tools” module
(F p.168).
For more information, refer to the section Maintenance servicing> Changing edger tools > Installing
the Step ++ wheel (F p.168).
This section describes the procedures for the creation of a step bevel:
◦ description of the Step bevel screens (F p.41)
◦ perform a Step bevel in “automatic trajectory” mode (F p.44) or “front surface tracking” mode.
(F p.46)
The use of the step bevel is determined by two parameters: frame and lens.
• Concerning the lens, the main constraint is the thickness of the nasal and temporal edges.
• Concerning the frame, the crucial elements are the bridge and shape of the groove. The hinge is an
additional factor in the case of a metal frame, the arms for a plastic frame.
For this job, the lens base must always match the frame base perfectly. Too great a difference
between the two could be detrimental to the quality of your job.
Cross-section of a step bevel
1: Value of shelf bevel of rear surface
2: Width of the flat side of the bevel
3. Front surface tracking value
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