Page 263 - NORTON cutting-off and grinding wheels - industrial
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263
BONDED ABRASIVES
GRIT SIZE
The number in the grinding wheel, marking designating grit size, represents the approximate number
of openings per linear inch in the final screen size used to size the grain. The following rules should
be followed:
USE COARSE GRIT
•
For soft, ductile, stringy materials such
as soft steel or aluminium
•
For rapid stock removal
•
Where finish is not important
•
For large areas of contact.
USE FINE GRIT
•
For hard, brittle materials such as hard
tool steels, cemented carbides & glass
•
For fine finishes
•
For small areas of contact
•
For holding small corner radii.
WHEEL GRADE
The grade indicates the relative holding power of the bond, which holds abrasive grains in a wheel.
This is represented in the specification by letters running through the alphabet from softest to hardest.
The following rules should be followed with regard to grade:
USE SOFT GRADE
•
For hard materials such as hard tool steels
& carbides
•
For large areas of contact
•
For rapid stock removal.
USE HARD GRADE
•
For soft materials
•
For small or narrow areas on contact
•
For longer wheel life.
COMMON RANGE OF GRADES
E F G H I
J
K L M N O P Q R S T U
CYLINDRICAL/CENTRELESS
SURFACE GRINDING
ID GRINDING
TOOL GRINDING
THREAD GRINDING
NON-REINFORCED ORGANIC
REINFORCED ORGANIC
BONDED
ABRASIVES
SUPER
ABRASIVES
DIAMOND
TOOLS
CLEANING,
POLISHING
& MASKING
PERSONAL
PROTECTION
EQUIPMENT
TECHNICAL
INFORMATION
