New standards, dimensional and operat-
ing data, tolerances, recommendations, ap-
plications and new tables appear in 13
subject areas. For example, the Cutting
Speeds and Feeds section is completely re-
vised and expanded in 20 subjects, and in-
cludes over 30 new tables for the machining
of metals and alloys. Likewise, complete
revision and expansion occur in sections on
spur gears, tool steels and grinding, while
new standards and data are added to 9 other
sec tions.
The 19th Edition of this standard refer-
ence work for the mechanical industries
recognizes the world-wide move towards the
use of the metric System International. As
the world goes in this area, so will the Hznd-
book. Th~ 19th Edition includes consider-
able metric data based on SI units, as well
as British Standards based mainly on ISO
Recommendations. Much of the Hand-
book s information is of course independent
of measurement units, or can be used with
metric or English units.
An invaluable aid and working tool wher-
ever anything mechanical is designed or
constructed, this world-renowned book
makes available in clear, concise, ready-to-
use form the new and hard-to-get as well
as the established standard data and in-
formation needed by machine designers,
mechanical engineers, tool designers, shop
management, skilled mechanics, engineer-
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