DIVIDING (Argus Workshop Practice Series No 37) by Harold Hall

Faced with the prospect of machining a gear or gears, for a project. Many model engineers will be discouraged and will turn else where for their next model. This need not be so for the principles underlying gear cutting and many other aspects of engineering where an accurate division of circles is explained in depth in this book
It covers the subject of Dividing, dealing with the many methods that can be adopted from simple applications with out specialised equipment to the use of semi universal dividing head and a rotary table. The mathematical aspects of dividing are also covered but at a level which will be understood by a model engineer. Dividing equipment is relatively expensive so two fully detailed designs are included for dividing heads: a basic unit and the equivalent of a commercial semi universal head ..

The principles underlying this aspect of engineering are explained in depth in this book.

Argus Workshop Practice Series Published: 2005 Soft cover 104 pages 15 x 21 cm Black & white photographs, technical diagrams ISBN-10: 1854862383 ISBN-13: 978-1854862389 Book DIV

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CONTENTS

• Chapter 1 [9]
  An introduction to Dividing
• Chapter 2 [12]
  The Machinery. Discusses the major items of equipment, Dividing heads, Rotary tables, Indexers, etc.
• Chapter 3 [18]
  The Methods. Explains how to use the equipment in Chapter Two to achieve the required result. Also explains though how even complex dividing can be achieved using no other equipment than that normally found in the workshop, typically the lathe and milling machine.
• Chapter 4 [32]
  The Mathematics. Whilst the tables provided with a dividing head., or those published in this book, will provide the information for most applications, occasionally recourse to calculation may be necessary. This chapter explains the process. fortunately., the mathematics is not complex.
• Chapter 5 [38]
  Holes on a Pitch Circle Diameter (PCD) Explains the mathematics for placing holes on a PCD using a milling machine's X and Y table movements and their calibrated leadscrew dials. Also shows how using a computer spread sheet program can be used to limit considerably the work involved.
• Chapter 6 [50]
  Shop Made Simple Dividing Devices. Some simple devices that will enable dividing activities without the need for a dividing head.
• Chapter 7 [58]
  Shop Made Basic Dividing Head. A simple dividing head that is easy to construct, and for most, will be adequate for all the dividing tasks required in the workshop
• Chapter 8 [71]
  Shop Made Full Function Dividing Head. A dividing head that is more adaptable than a commercially available semi-universal head and providing a wider range of divisions. It is not over complex to make and would be a very satisfying project to complete.
  Chapter 9 [82]
  Shop Made Lining Tool. Engraving a dial with its different length lines is made easy with this lining tool. It is also an interesting project to construct.
• Chapter 10 [90]
  Prime Numbers. Prime numbers and their uses explained and listed.
• Chapter 11 [98]
  Tables. Tables for a wide range of dividing head ratios and division plate hole numbers are included. These should make the need for calculation a rare occurrence