Please Donate if you find this workbook useful  and to help me keep improving the online version. We are Thankful for any and all amounts! Even the smallest amount is appreciated and beneficial. So far as of 09/29/09 no one has donated anything and this site gets about 30 hits per day. So if you are thinking ":man I bet he gets hundreds of dollars a day doing this" It simply is not true. Please at least follow the Amazon links and buy a book, calculator or Precision tools if you need such an item, to help me keep up this free online version. Thanks Again, David Coultas

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DVC PLANNERS PRECISION SHEET METAL LAYOUT MANUAL #1

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.Begin Table C.

INTRODUCTION   (Scroll Down for intro.                      1

ORDER IN THE MATH  (updated 09/23/09)                       2

ENGLISH DECIMALS (updated 09/29/09)                         3

GEOMETRY; POINTS, LINES, SEGMENTS, & RAYS                   4

PLANES, PLANE AND SOLID GEOMETRY (added 05/16/2009)         5

CIRCLES  (added 05/28/2009)                                 6

TRIANGLES  (added 05/30/2009)                               7

LOOKING AT TRIGONOMETRY A COMMON SENSE APPROACH(06/12/2009) 8

SOME COMMON SENSE TRIG FORMULAS (added 06/12/2009)          9

RIGHT ANGLE TRIANGLES  (added 07/05/2009)                   10

TRIGONOMETRY MADE SIMPLE (added 07/05/2009)                 10

WHERE TWO SIDES ARE KNOWN (added 07/05/2009)                11

PYTHAGOREAN THEOREM   (added 09/19/2009)                    12

INTERSECTING LINES AND ANGLE RELATIONS (added 09/19/2009)   13

SOLVING TRIANGLES   (added 09/21/09)                        14

COORDINATE SYSTEMS                                          16

NC ANGULAR ORIENTATION                                      17

BENDING                                                     18

BEND ALLOWANCE                                              19

BEND DEDUCTION                                              20

90 DEGREE BENDS                                             22

DIMENSIONING INTERNAL FEATURES                              24

NEUTRAL LINE THEORY                                         25

NOTCHES                                                     30

RELIEF NOTCHES                                              31

90 DEGREE V NOTCHES                                         32

BEND RELIEFS                                                33

BEND RELIEF SLOTS                                           34

HEMS                                                        35

JOGGLES AND OFFSETS                                         36

WORK PROBLEMS                                               37

SOME COMMON DEVELOPMENT PROBLEMS                            39

ACUTE BENDS                                                 40

OBTUSE BENDS                                                41

OBTUSE AND ACUTE WORK PROBLEMS                              42

WORK PROBLEM "SOMEPART"                                     46

WORK PROBLEM "SAMPLE"                                       48

DEFINITIONS AND ABBREVIATIONS                               50

ANSWER KEY                                                  51

BEND DEDUCTION/BEND ALLOWANCE CHART                         55

ADDITIONAL BONUS MATERIAL:
HOLES NEAR EDGES
COMPUND ANGLES
PUNCH PRESS TRICKS
DIMENSIONING FEATURES ON ARCS
SELECTING BASIC BRAKE DIES
BOX WITH SPOTWELDED FLANGES

.End Table C.

No part of this publication may be reproduced, or transmitted, or stored, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of Raymond David Coultas. Fifth Edition Reformatted Internet Edition ©2009 David Coultas

DVC PLANNERS
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2. Materials

a) Math Book

b) Calculator

c) Workbook

II. Math

1. Mathematical Hierarchy

I. Introduction

1. Goal

If you have been working in a sheet metal shop, plan to work in one, or just want to sharpen and improve your skills with sheet metal then this manual will help you to do that.

The goal of this manual is to help you gain an understanding of precision sheet metal layout and show you how to do flat pattern development while becoming more efficient with math in the shop. Therefore the first part of this manual deals strictly with math that is related to sheet metal development. Geometry, Algebra and Trigonometry will all be used. Don’t let this scare you because once you have something to relate it to the math becomes easier.

One way of becoming more efficient in math is proper use of the calculator. The calculator is not always used to its fullest capability in the shop in most cases. Normally it is used only as an adding machine. I have even seen people with calculators that are capable of trig functions go and look up trig tables in a book to complete a problem. People with calculators also go to fraction charts to convert to decimals when it is just a few key strokes away on their calculators. The calculator should be used as a production tool speeding up shop calculations.

This manual was designed to be used with a scientific calculator with at least trigonometry functions on it. It should also have direct formula input (Follow mathematical hierarchy rules. see page:2)

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Please Donate if you find this workbook useful  and to help me keep improving the online version. We are Thankful for any and all amounts small or great!

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