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All machinists must be able to do math. Math is used to calculate dimensions of
parts, to determine the time and cost of producing parts, to set up machine tools
to cut tapers, and to make gears. Math for Machinists was written for students
who are learning the machining trades in high schools, technical colleges, or in
apprentice programs in industry. It can be used in a math class to supplement a
core mathematics textbook, as the basis for an applied math class for machining
students, or as a math supplement to a core machine shop textbook.
Some math can be done just by pressing keys of a calculator, but you will not
proceed very far in your machine shop studies before you will need to know more.
Performing math operations on a calculator can require knowledge of the order in
which operations should be performed.
The book begins with fundamental operations with whole numbers and then
progresses to fractions, decimals, ratios, and proportions and eventually covers more
complex subjects that require powers and roots of numbers, trigonometry, and basic
geometry. Section 5 is devoted to linear measure, beginning with reading a rule
and ending with reading vernier scales. Section 6 has fi ve units covering equations
and formulas used for threads, tapers, feeds and speeds, and spur gears.
Math for Machinists is organized in sections and units. Each section is a
grouping of short units focusing on a single topic, so the student is not overwhelmed
with multiple topics at one time. Each unit is meant to be studied as a single lesson.
New key terms that are introduced in the section are listed on the section opener
page. Each unit begins with two or three learning objectives to be covered in that
unit. Concepts and operations are explained simply and concisely and as each
new bit of information is covered, examples are used to illustrate what is being
explained. The units end with a selection of math problems, so you can practice
using the new information. Following the practice problems, there are application
problems and machine shop word problems.
Having taught in a technical education classroom for many years and as the
father of four sons, one of whom struggled mightily with basic math, I have a good
understanding of the diffi culties many students face with math. I am confi dent
that machining students will be able to do all of the math that is required in their
studies if they will complete the units of Math for Machinists.
Mark W. Huth
Preface