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ISCAR uses charts and tables to specify the cutting The basic principle for selecting the grades is that
area of milling tools and proposes suitable grades for when abrasive wear is dominant, a hard grade
replaceable inserts in indexable milling cutters, solid should be used, whereas a tough grade is needed
(mainly solid carbide) endmills, and replaceable solid for substantial mechanical loading during cutting.
milling heads with Multi-Master adaptation. For example, for finish milling with typically small
machining allowance (machining stock), high cutting
ISCAR characterizes the grades as main and speed and low feed, hard grades will be more
complementary. The main grades are more popular efficient. However, tough grades will be required for
in machining specific engineering materials, but heavy-duty roughing that removes significant volume
complementary grades can be effective as well in of material and features considerable cutting load.
certain cases. When a main grade is not available for
producing a certain product, a complementary grade Even with the myriad of digital options available
provides an acceptable alternative. today, tool manufacturers often prefer the simplicity
and clear visuals offered by traditional tables and
The tables provide summary data for grade charts that provide important data in an easily
applications and the charts show “an applicative map interpretable and effective way, allowing optimal
of grades”, in coordinates of classification numbers selection of the right tool materials for each
from standard ISO 513. The figures often prioritize application.
the main grades by numbers in brackets below
the designation of a grade. Prioritizing is general in
character and is intended to assist in selecting the
correct grade when there is insufficient information
about the application.
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