Catalogues - the-mastery-of-flat-glass

Catalogue The Mastery Of Flat Glass

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ABRASIVE

Guidelines for the choice

of the best bond/abrasive ratio

in glass processing.

When choosing the best combination of abrasive (diamond) and bond (metal or resinoid) for glass processing a series of factors must be taken into account, such as:

Main types of bonds.

There are various types of bonds:

• vitrified and ceramic bonds

• resinoid bonds

• metal bonds

• elastic bonds

• type and structure of the machine

(power, rpm, degree of stability = for example, vibrations, chuck play, etc.)

• processing parameters

(peripheral wheel revolutions, feed speed, etc.)

• required tool life time (efficiency)

• required tool cutting capability (processing speed)

• required polishing quality (roughness)

• refrigerating system

N.B.: In glass processing, metal bonds are used in the gross machining and semifinishing operations because they are the hardest. Resinoid bonds are more suitable for polishing and superpolishing operations because they are softer. Metal bond wheels have an excellent autoretipping capability and preserve their profile rather well, whereas resinoid bond cup wheels and peripheral wheels provide better polishing.

4-coarser Grit size finer-^

10 24 54 100 240 500 1200

Stock removal/Q Economical efficiency

Chips

higher

less

Surface quality Surface finish

fine

rough

unfavourable Profile accuracy/Profile holding

f\f\_J~\y^S\^ Sharpness of edges

better

longer chipping soft, ductile

Material

shorter chipping hard, brittle

higher

Breakage speed/Safety

less