Glazing
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This document summarizes the process of glazing, which involves fitting lenses into spectacle frames. It discusses the key steps of laying off markings on the lens, lens cutting and edging, and fitting. Lens cutting historically involved manually outlining and chipping lenses, but now is done automatically by edgers. Edging shapes the lens to the frame and creates a bevel. Edging can be done manually with ceramic or diamond wheels or automatically through pattern or patternless edging, where data from a frame tracer is used to directly edge the lens without a pattern. The lens is then fitted into the frame.
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Glazing
- 1. GLAZING - BY Happy patel & Payal sangani
- 2. Process of fitting lenses into a spectacle frame..
- 3. glazing Laying off Lens cutting Lens edging fitting
- 4. Laying off Before a lens can be edged, marking of cyl axis pd lens size,according to frame etc. should be marked in the correct position relative to the lens shape & specific individual Rx by using.
- 6. Lens cutting & chipping In the past lens cutting & chipping process involved Glass cutter: that outlining the desired lens shape on the glass with an appropriate marking The lens was cut several mm larger than required,for some inaccuracy in chipping the lens & lens edge finish After lens cutting,outermost areas of glass were removed using chipping pliers This is done only in manual edging process,in the automatic edger,the full lens is edged to the required shape
- 7. edging This step involves the finer edging of the lens to the shape of the frame rim and creating a bevel for the lens to be seated in the frame groove. The edger has multiple wheels, provided for gross edging, finishing and for bevel creation. Flat edge : rimless Bevel edge : rimmed frame
- 8. To converting an uncut lens to the desired lens shape Edging manual auto pattern Pattern less
- 9. Manual:hand edging Types of hand edger - ceramic wheel - diamond wheel Now days more useful for: - edge smotthing - reducing a lens size - reshaping the len
- 10. Manual edging
- 12. AUTO EDGING Pattern Edgeing: (semi auto) Information from the pattern edger shape is used to cut out. This pattern is then run along a sensor, the data from which, is used by the edger to edge the lens Patternless Edgers: (fully auto) information from the frame scanner/tracer is transferred directly to the edging machine, which edges the lens accordingly
- 13. Pattern/edging former For converting an uncut lens to the desired shape is by the use of former/pattern. Made from flat plastic material or metal plate It is held in position by holes to determine the horizontal line of shape& standard oc position Available in according different eyesize
- 14. Pattern Edger
- 15. Pattern Measurements and Terminology mechanical center: of a pattern is the point on the pattern around which the pattern rotates. - The mechanical center is easy to find since it is found in the middle of the large hole in the pattern Pattern Making : Because of the vast number of available frame styles, it is impossible to have a complete library of patterns -36.5 mm standard size - to prevent pattern distortion,the pattern made larger
- 16. Pattern Edging
- 18. Pattern less
- 19. Steps & facilities Electronic shape Required lens and frame materials as a option Patternless edging viewing screen - that shows lens shape -show the edge of the lens Lens drilling as an option Self-calibration & decentration calculation because tracer knows dbl & pd
- 20. Electronic shape by frame tracer
- 21. Frame tracer
- 22. measurements about lens size,dbl,pd etc.
- 23. Required lens and frame materials as a option
- 25. Patternless edging viewing screen
- 27. Lens fitting lens is inserted into the frame. SPRINGING IN : insertation of the lens in rimmed frame RIMLESS FITTING : insertation of the lens in rimless frame
- 28. REFRENCE :