Trade of Toolmaking - eCollege

Trade of Toolmaking – Phase 2
Module 3 Unit 8
Table of Contents
Table of Contents .....................................................................................................................2
Unit Objective...........................................................................................................................4
Introduction..............................................................................................................................4
1.0 Precision Milling Of Symmetrical Components........................................................5
1.1 Engineering Drawing: Assembly, Plans, Elevations And End View ........................5
1.2 Importance Of Symmetry In Mating Components ....................................................5
1.3 Importance Of Centre Lines To Establish Symmetry................................................5
1.4 Application Of Geometric Tolerances To Squareness, Parallelism And Angularity 6
1.5 Safe Operation Of Milling Machine ..........................................................................6
1.6 Removal Of Sharp Edges On Mating Components ...................................................6
1.7 Job Planning: Sequence Of Operations .....................................................................6
2.0 Measuring And Analysing The Function And Fit Of The Components................7
2.1 Iso And Bs Limits And Fits, Principles And Use Of Slip Gauges ............................7
2.2 Care Of Slip Gauges ..................................................................................................7
2.3 Maximum And Minimum Material Conditions.........................................................7
2.4 Limits And Fits: Classes Of Fits................................................................................7
2.5 Hole And Shaft Basis System....................................................................................8
2.6 Definitions: I.E. Tolerance, Nominal Size, Allowance And Deviation.....................8
Summary...................................................................................................................................9
Suggested Exercises ...............................................................................................................10
Questions.................................................................................................................................11
Answers...................................................................................................................................12
Recommended Additional Resources...................................................................................13
Reference Books ..................................................................................................................13
Unit 8 2