The history of the development of the tool-making art is, of
course, the history of the mechanical development of the
country. The hand working tools came first and then with the
invention of each successive machine came the creation of
to go with it.
The gradual evolution of machine methods
brought an increase in the required accuracy of workmanship
and this in turn demanded more precise methods and greater
skill on the part of the tool maker.
Today, therefore, the
large body of so-called "tool makers" represents the most
skilled, the most inventive, and the most intelligent of the
army of mechanics which forms the back bone of our immense
Many phases of this mechanical development have increased
the importance of the tool maker - the introduction of
high-speed steels, demanding greater skill in construction
of the tools because of the greater demands upon them; the
variation of hardening and tempering methods owing to the
variety of steels used; and particularly the use of
"production" methods which necessitates the design and
manufacture of complicated tools, jigs, and fixtures for the
rapid duplication of any given machine.
The design of
efficient and complete sets of such tools requires highly
developed knowledge of machine methods, and a thorough
understanding of the machines for which the tools are
The author of this work has had years of experience not only
in teaching the subject but in the practical side as well,
and is able to give the reader a multitude of helpful
suggestions for successfully carrying out the mechanical operations required.
It is the hope of the
publishers that this work will be found a worthy
contribution to our standard technical literature.
Fundamental requirements for successful work
Tool materials and their treatment
Crucible steel and its preparation
Use of pyrometers
Hardening and tempering crucible steel
Modern high-speed steels