Siemens Sinumerik 840D sl Programming Manual page 7

Table of contents
Preface.........................................................................................................................................................3
1 Fundamental safety instructions.................................................................................................................13
1.1 General safety instructions.....................................................................................................13
1.2 Industrial security...................................................................................................................13
2 Fundamental Geometrical Principles..........................................................................................................15
2.1 Workpiece positions...............................................................................................................15
2.1.1 Workpiece coordinate systems..............................................................................................15
2.1.2 Cartesian coordinates............................................................................................................15
2.1.3 Polar coordinates...................................................................................................................17
2.1.4 Absolute dimensions..............................................................................................................18
2.1.5 Incremental dimension...........................................................................................................20
2.2 Working planes......................................................................................................................21
2.3 Zero points and reference points...........................................................................................22
2.4 Coordinate systems...............................................................................................................24
2.4.1 Machine coordinate system (MCS)........................................................................................24
2.4.2 Basic coordinate system (BCS).............................................................................................26
2.4.3 Basic zero system (BZS)........................................................................................................28
2.4.4 Settable zero system (SZS)...................................................................................................29
2.4.5 Workpiece coordinate system (WCS)....................................................................................30
2.4.6 What is the relationship between the various coordinate systems? ......................................31
3 Fundamental Principles of NC Programming.............................................................................................33
3.1 Name of an NC program........................................................................................................33
3.2 Structure and contents of an NC program.............................................................................34
3.2.1 Blocks and block components................................................................................................34
3.2.2 Block rules..............................................................................................................................37
3.2.3 Value assignments.................................................................................................................38
3.2.4 Comments..............................................................................................................................38
3.2.5 Skipping blocks......................................................................................................................39
4 Creating an NC program............................................................................................................................41
4.1 Basic procedure.....................................................................................................................41
4.2 Available characters...............................................................................................................42
4.3 Program header.....................................................................................................................43
4.4 Program examples.................................................................................................................44
4.4.1 Example 1: First programming steps.....................................................................................44
4.4.2 Example 2: NC program for turning.......................................................................................45
4.4.3 Example 3: NC program for milling........................................................................................47
Fundamentals
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
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