Edging Neksia & Patterned Edgers W5 Flashcards
Within the US, the
standard
pattern size adopted is
36.5 mm
To increase accuracy in edger settings, the person edging should take their own measurements, as opposed to using only the measurements marked on the frame.
True
Inserting lenses into a plastic frame without the assistance of heat is considered
Cold Snapping
The position and style of the bevel makes a great deal of difference in the appearance of the finished
eyewear.
True
For beveled frames the placement of the bevel is critical for which two reasons
To help hide lens thickness
To help reduce the amount of lens behind the frame front
For the best cosmetic appearance, high minus lenses should have which type of bevel design and
placement
Hide-a-bevel (1/3|2/3)
Edgers that uses cutting wheels have a two step cycle. During the first part of the cycle the lens is edged to its
basic shape and size; this is carried out on the …
Roughing Wheel
Edgers that uses cutting wheels have a two step cycle. During the second part of the cycle the
lens moves over to a finer grit wheel that grinds the finished edge and final size; this is carried out on the …
Finishing wheel
edgers must employ water to cool the lens
while processing. Edgers that use wheels are often referred to as
Wet Cut Edgers
Non diamond wheeled edgers, slices
little chips off the lens very quickly and does not generate the amount of heat that wheel cutting systems do
Spinning blades
Lenses cut on spinning wheel are considered …
Dry cut
Do spinning bladed edgers work with glass
No and require a vacuum system to remove lens debris
When the facet is used, high-minus lens edge thickness is reduced.
true
consists of a light source behind two crossed polaroids. When a lens is placed between two
polaroids, internal lens stress becomes visually apparent.
Colmascope
Many patternless edgers use measuring arms that touch the front and back surface of
the lens at the exact place where the lens edge will be when edging is complete
Feelers
This decides optimum bevel position based on thickness and lets you be more precise in choice of MBS due to it
measuring the exact place the lens wedge will be.
Feelers
pliers helpful in the process of determining whether a lens is the correct size for
a metal frame
Eyewire closure pliers
Which of the following lenses are said to emit a sulfurous odor when edging?
High-index plastic
Can cause crazing on AR coated lens
Heat, pressure or lens flexing
Ability to drill the lens holes for rimless mountings
Ability to groove the lens for semi-rimless mountings.
Ability to polish the edges of the lens.
Ability to safety/pin bevel the edged lens.
Ability to decenter the lens
Options on lens edger
may reduce spoilage of antireflection-coated lenses
Use surface-saver tape or discs on the lens.
Reduce chuck pressure on the edger
Avoid heat on the lens when heating the frame and lens together.
an abrasive wheel that has become clogged with plastic material, preventing good, clean
cutting.
glazed wheel
edging methods yields a more stress-free polycarbonate lens
edging the lens dry until partway through the finishing cycle, after which the lens is finished
wet
