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Eyeglass Fabrication & Design > Edging > Flashcards

Edging Flashcards

1
Q

What are the 8 steps to the edging process?

A

1-Setting the edger size
2-Setting parameters and specifications
3-Marking edger dials
4-Chucking lenses
5-Determining bevel placement
6-Cutting
7-Checking sizing accuracy
8-Mounting

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2
Q

What is pattern making?

A

The process of making an object that matches the shape of a lens in a frame which be used as a guide to edge uncut lenses.

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3
Q

When does the pattern making process occur?

A

Takes place after surfacing, coating, and centration.

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4
Q

What are 5 advantages of a frame tracer?

A

-determines size and shapeconsistently
-Traces frame in three, instead of two dimensions
-Works with an edger to demonstrate what the placement of the bevel will look like at any given point on a lens
-Trace a shape from an old lens or coquille
-Transfer data to a surfacing laboratory to help determine how thin a lens may be surfaced

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5
Q

What are 4 disadvantages of a frame tracer

A

-plastic frame may not retain the same shape it had with the demonstration lens in place
-may change the shape of the eyewire as they trace as the tracer exerts force
-Remotely traced frames may not exactly match the old lens
-are unable to trace frames with narrow B dimensions

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6
Q

What is chucking?

A

a method of keeping a lens in a certain position relative to the rotational/geometric center of a shape in order to accurately shape a lens for a given frame

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7
Q

What are the three types of chucking?

A

Manual
Air
Electric

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8
Q

Explain Manual Chucking 2

A

-clamped firmly but not with excessive pressure
-then handle locked in place

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9
Q

Explain Air Chucking 2

A

-lens holding assembly is connected to a air line and compressor which applies clamping force
-also known as pneumatic chucking

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10
Q

Explain Electric Chucking 2

A

-Drive motor presses the lens holding assembly together to hold the lens in place
-pressure can be controlled depending on the material

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11
Q

What consideration should we make when chucking a polycarbonate material? 2

A

-softer material
-ensure all surfaces that the lens touches are free from rough edges or burrs

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12
Q

What considerations should we make when chucking an antireflection-coated lens?

A

-microcracks/crazing can occur on lens surface due to heat, pressure, and flexure

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13
Q

What considerations should we make when chucking an laminated lens?

A

specialized wheel is required

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14
Q

What is a roughing wheel?

A

A coarse diamond wheel which cuts a lens down to rough
size rapidly.

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15
Q

What is a finshing wheel?

A

Finer diamond wheel brings lens to size and incorporates
required bevel.

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16
Q

What do we consider when edging crown glass in regards to the wheels?

A

Requires a different roughing wheel specific for
glass

17
Q

What do we consider when edging photochromatic glass in regards to the wheels?

A

Treated almost the same as crown glass but due to the heat it produces during edging, it is harder on
wheels and may require specially designed wheels

18
Q

What do we consider when edging high index glass in regards to the wheels?

A

-Should be edged with less pressure than
standard crown glass

19
Q

What do we consider when edging CR39 Plastics in regards to the wheels? 2

A

-Same roughing wheels that cut glass can be used
-wheels require dressing as plastic particles clog spaces
between abrasive surfaces

20
Q

What do we consider when edging High-Index Plastic in regards to the wheels? 2

A

-Edged in the same manner as CR39
-can emit a non-hazardous sulfurous odor - ventilation
recommended

21
Q

What are the 3 main bevel types?

A

V-bevel
Hide-a-bevel
Mini-bevel

22
Q

What is a V-bevel? 2

A

-groove apex in the middle of the lens
-rarely used today

23
Q

What is a hide-a-bevel?

A

A flat or sightly angled edge either in front of or behind the
bevel of a lens

24
Q

What is a mini bevel?

A

A hide-a-bevel with an angled ledge

25
Q

What are 3 different edge types?

A

Facet
Rolled
Polished

26
Q

Explain a facet edge type. 2

A

-Used with rimless, grooved, and thin metal frames
-resembles beveled edge but with a relatively steep bevel
cut onto the front or back edge, then highly polished

27
Q

Explain a rolled edge type.

A

Reduces minus lens edge thickness by rounding the back
surface edge of a lens

28
Q

Explain a polished edge type

A

Gives the lens an especially smooth appearance

29
Q

What is pin beveling?

A

Pin bevelling smooths out the bevel.

30
Q

What are the reasons pin bevelling is used?

A

Breakage prevention
Cosmetic considerations
Wearers safety

Eyeglass Fabrication & Design (7 decks)

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