CNC Setting and Operation Workbook

CNC Setting and Operation Workbook

City and Guilds Co-publishing Series City and Guilds of London Institute has a long his tory of providing assessments and certification to those who have undertaken education and training in a wide variety of technical subjects or occupational areas. Its business is essentially to provide an assurance that pre-determined standards have been met. That activity has grown in importance over the past few years as government and national bodies strive to create the right conditions for the steady growth of a skilled and flexible workforce. Both teachers and learners need materials to support them as they work towards the attainment of qualifications, and City and Guilds is pleased to be working with several distinguished publishers towards meeting that need. It has been closely involved in the planning, author selection and text appraisal, although the opinions expressed in the publications are those of the individual authors and are not necessarily those of the Institute. City and Guilds is fully committed to the projects listed below and is pleased to commend them to teaching staff, students and their advisers. Carolyn Andrewand others, Business Administration Level I and Business Administration Level II, John Murray Chris Cook, Assessor Workbook, Macmillan David Minton, Teaching Skills in Further and Adult Education, Macmillan Graham Morris and Lesley Reveler, Retail Certificate Workbook (Levels 1 and 2), Macmillan Peter Riley(consultant editor), Computer-aided Engineering, and associated Workbooks: CNC Setting and Operation; CNC Part Programming; COlllputer-aided Draughting; Robot Technology; Programmable Logic COlllrol, Macmillan Barbara \Vilson, Information Technology: the Basics, Macmillan Caroline Wilkinson, Information Technology in the Office, Macmillan

CNC Setting and Operation Workbook Tom Renshaw Department of Engineering Technology Blackpool and The Fylde College Consultant Editor: Peter Riley Formerly Head of Department of Engineering Technology, Blackpool and The Fylde College M MACMILLAN ~ Cityand Guilds C+3

Tom Renshawand City and Guild~ nf I.ondon Institute 199.+ All rights resen"ed. No reproduetion, copy or transmissinn of this publieation may be made without written permission. No paragraph of this publieation may be reprodueed, eopied ur transmitted save with the written permission or in accordance \\"ith the provisions of the Copyright, Designs and Patents Act 1988, or under the terms of any lieenee permitting limited copying issued by the Copyright Lieensing Ageney, 90 Tottenham Court Road, London WIP 9HE. Any person who does any unauthorised act in relation to this publieation may be liable to eriminal prosecution and ci\"il elaims for damages. First published 1994 by THE MACMILLAN PRESS LTD Houndmills, Basingstoke, Hampshire RG21 2XS and London Companies and representati\'es throughout thc world ISBN 978-1-349-12687-3 ISBN 978-1-349-12685-9 (ebook) DOI 10.1007/978-1-349-12685-9 A eatalogue record for this book is a\"ailable from the British Library Typeset by EXPO Holdings, Malaysia Acknowledgements Thanks are duc to the following for perm iss ion to use photographs: Cincinnati Milaeron (page 3), Norelen (page 16).

Contents Introduction How to use this book Safety note Learning Assignment 1 Position machine axes Task 1.1 Absolute and ineremental positioning Task 1.2 Cheeking table limits of travel Task 1. 3 Manual positioning of tool in all axes Learning Assignment 2 Methods of guarding Proteeting the operator Proteeting the maehine and/or workpieee Task 2.1 Methods of proteetion on CNC maehines Task 2.2 Operating the maehine Z axis loek Task 2.3 Spindie motor proteetion on a turning eentre Task 2.4 Cheeking interloek guards 1 2 3 4 5 7 7 8 8 8 9 9 9 10 Learning Assignment 3 Machine datums Task 3.1 Setting maehine to datum position Task 3.2 Re-setting maehine override 12 Task 3.3 Transferring maehine datum to workpieee datum 13 Task 3.4 Component loeation using work eo-ordinates 13 11 12 Learning Assignment 4 Work-holding Se1eeting damps Task 4.1 Component setting Task 4.2 Component damping Learning Assignment 5 Ne tooling Task 5.1 Working praetiees Task 5.2 Tool tip seleetion Task 5.3 Tool identifieation Learning Assignment 6 Tool changing Manual tool eh anging Automatie tool ehanging using magazines or earousels Automatie tool ehanging using turrets Task 6.1 Tool seleetion: turning Task 6.2 Tool seleetion: milling Learning Assignment 7 Tool off set facilities: turning Programming information Task 7.1 Setting a tool offset in the X axis Learning Assignment 8 Toollength offsets: milling Methods of tool offset measurement Task 8.1 Setting TLO values manually on a maehine Task 8.2 Set TLO values away from the maehine 14 14 15 15 17 17 18 18 21 21 23 23 23 25 25 26 26

Learning Assignment 9 Tool setting 27 Pre-setting 28 Setting on the machine (turning) 28 Qualified tooling 28 Task 9.1 Pre-setting tools using a fixture 29 Task 9.2 Pre-setting tools by measurement on machine 29 Tool nose radius compensation (TNRC) 30 Learning Assignment 10 Ne program listing and analysis 31 Task 10.1 Program analysis 32 Task 10.2 Program efficiency 32 Learning Assignment 11 Task 11.1 Data storage Task 11.2 Data transfer Input, edit and store data 34 34 35 Learning Assignment 12 Pro gram proving Testing method 1: Dry run Testing method 2: Step through block by block Testing method 3: Graphie simulation Task 12.1 Pro gram proving Task 12.2 Program proving and correction Learning Assignment 13 Tape handling Task 13.1 Tape editing Task 13.2 Tape loading and re-winding Learning Assignment 14 Tape preparation Code standards for punched tape Preparing the paper tape Task 14.1 Tape preparation Glossary Index 36 37 37 37 38 38 40 41 42 43 43 45 45 47 49