The NIST RS274NGC Interpreter

From: Subject: The NIST RS274NGC Interpreter - Version 3 Date: Tue, 30 May 2006 07:35:01 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01C683BB.8FA8DF90" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2663 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C683BB.8FA8DF90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.isd.mel.nist.gov/personnel/kramer/pubs/RS274NGC_3.web/RS274NGC_3TOC.html The NIST RS274NGC Interpreter - Version 3

3D"National

The NIST RS274NGC Interpreter - = Version 3=20

Thomas R. Kramer
Frederick M. Proctor
Elena Messina

Intelligent Systems Division
National Institute of Standards and = Technology
Technology Administration
U.S. Department of Commerce
Gaithersburg, Maryland 20899

NISTIR 6556
August 17, 2000

Disclaimer
Commercial equipment and materials are identified in = order to=20 specify certain procedures adequately. In no case does such = identification=20 imply recommendation or endorsement by the National Institute of = Standards and=20 Technology, not does it imply that the materials or equipment = identified are=20 necessarily the best available for the purpose.

Acknowledgements
Partial funding for the work described in this paper = was=20 provided to Catholic University by the National Institute of Standards = and=20 Technology under cooperative agreement Number 70NANB7H0016.

Abstract
This report describes an interpreter which reads = numerical=20 control code and produces calls to a set of canonical machining = functions. The=20 interpreter is a software system written in the C++ programming = language. The=20 output of the interpreter may be used to drive 3-axis to 6-axis = machining=20 centers. Input to the interpreter is RS274 code in the dialect defined = by the=20 Next Generation Controller (NGC) project, with modifications. The = interpreter=20 may be compiled as a stand-alone computer program or may be integrated = with=20 the NIST Enhanced Machine Controller (EMC) control system. Input can = come from=20 a file or from a user typing on a computer keyboard. Output commands = can=20 either be printed for future use or be executed directly on a = machining=20 center. The report includes a full description of the RS274/NGC input = language=20 and the canonical machining functions called by the interpreter. It is = a=20 complete users manual.

Keywords
controller, interpreter, machining, NC code, = numerical=20 control, NIST, rs274

1.0 Introduction=20 1
1.1 Audience=20 1
1.2 Background=20 1
1.2.1 Enhanced=20 Machine Controller Project 1
1.2.2 Numerical=20 Control Programming Language RS274 1
1.2.3 The=20 RS274/NGC Language 2
1.2.4 Previous=20 Work at NIST 2
1.2.5 Current=20 Work at NIST 3
1.3 Major=20 Characteristics of the Interpreter 3
1.3.1 How=20 it Runs 3
1.3.2 Modes=20 of Use 3
2.0 Machining=20 Center Overview 4
2.1 Machining=20 Centers 4
2.1.1 Mechanical=20 Components 4
2.1.2 Control=20 and Data Components 6
2.2 Interpreter=20 Interaction with Switches 9
2.2.1 Feed=20 and Speed Override Switches 9
2.2.2 Block=20 Delete Switch 9
2.2.3 Optional=20 Program Stop Switch 9
2.3 Tool=20 File 9
3.0 Input:=20 the RS274/NGC Language 12
3.1 Overview=20 12
3.2 RS274/NGC=20 Language View of a Machining Center 12
3.2.1 Parameters=20 12
3.2.2 Coordinate=20 Systems 14
3.3 Format=20 of a Line 14
3.3.1 Line=20 Number 15
3.3.2 Word=20 15
3.3.3 Parameter=20 Setting 18
3.3.4 Comments=20 and Messages 18
3.3.5 Item=20 Repeats 19
3.3.6 Item=20 order 19
3.3.7 Commands=20 and Machine Modes 19
3.4 Modal=20 Groups 20
3.5 G=20 Codes 21
3.5.1 Rapid=20 Linear Motion - G0 23
3.5.2 Linear=20 Motion at Feed Rate - G1 23
3.5.3 Arc=20 at Feed Rate - G2 and G3 23
3.5.4 Dwell=20 - G4 25
3.5.5 Set=20 Coordinate System Data - G10 25
3.5.6 Plane=20 Selection - G17, G18, and G19 25
3.5.7 Length=20 Units - G20 and G21 26
3.5.8 Return=20 to Home - G28 and G30 26
3.5.9 Straight=20 Probe - G38.2 26
3.5.10 Cutter=20 Radius Compensation - G40, G41, and G42 28
3.5.11 Tool=20 Length Offsets - G43 and G49 29
3.5.12 Move=20 in Absolute Coordinates - G53 29
3.5.13 Select=20 Coordinate System - G54 to G59.3 29
3.5.14 Set=20 Path Control Mode - G61, G61.1, and G64 30
3.5.15 Cancel=20 Modal Motion - G80 30
3.5.16 Canned=20 Cycles - G81 to G89 30
3.5.17 Set=20 Distance Mode - G90 and G91 36
3.5.18 Coordinate=20 System Offsets - G92, G92.1, G92.2, G92.3 36
3.5.19 Set=20 Feed Rate Mode - G93 and G94 37
3.5.20 Set=20 Canned Cycle Return Level - G98 and G99 37
3.6 Input=20 M Codes 38
3.6.1 Program=20 Stopping and Ending - M0, M1, M2, M30, M60 38
3.6.2 Spindle=20 Control - M3, M4, M5 39
3.6.3 Tool=20 Change - M6 39
3.6.4 Coolant=20 Control - M7, M8, M9 39
3.6.5 Override=20 Control - M48 and M49 39
3.7 Other=20 Input Codes 40
3.7.1 Set=20 Feed Rate - F 40
3.7.2 Set=20 Spindle Speed - S 40
3.7.3 Select=20 Tool - T 40
3.8 Order=20 of Execution 41
4.0 Output:=20 the Canonical Machining Functions 42
4.1 Introduction=20 42
4.1.1 Objectives=20 of Canonical Machining Functions 42
4.1.2 Implementing=20 Canonical Machining Functions 42
4.2 Canonical=20 Machining Function View of a Machining Center 45
4.2.1 Mechanical=20 Components 45
4.2.2 Control=20 Components 45
4.2.3 Error=20 Conditions 46
4.3 The=20 Canonical Machining Functions Defined 46
4.3.1 Preliminaries=20 46
4.3.2 Initialization=20 and Termination 47
4.3.3 Representation=20 47
4.3.4 Free=20 Space Motion 48
4.3.5 Machining=20 Attributes 48
4.3.6 Machining=20 Functions 51
4.3.7 Spindle=20 Functions 55
4.3.8 Tool=20 Functions 57
4.3.9 Miscellaneous=20 Functions 58
4.3.10 Program=20 Functions 61
4.3.11 Cutter=20 Radius Compensation 61
5.0 Stand-Alone=20 Interpreter 62
5.1 Running=20 the SAI 62
5.1.1 Starting=20 the SAI 62
5.1.2 Running=20 with Keyboard Input 63
5.1.3 Running=20 with RS274/NGC File Input 65
5.2 Building=20 an SAI Executable 65
5.3 Interpreter=20 Speed 68
Appendix A Error=20 Handling 70
A.1 Basic=20 Approach 70
A.2 Handling=20 Calculated Values 71
A.3 Compiler=20 Macros 71
A.4 Automatic=20 Generation of Software 71
A.5 Interpreter=20 Bugs 72
A.6 Stand-Alone=20 Interpreter Driver Error Messages 72
Appendix B Cutter=20 Radius Compensation 73
B.1 Introduction=20 73
B.1.1 Data=20 for Cutter Radius Compensation 74
B.2 Programming=20 Instructions 75
B.2.1 Turning=20 Cutter Radius Compensation On 75
B.2.2 Turning=20 Cutter Radius Compensation Off 75
B.2.3 Sequencing=20 75
B.2.4 Use=20 of D Number 75
B.3 Material=20 Edge Contour 75
B.3.1 Programming=20 Entry Moves 76
B.4 Nominal=20 Path Contour 78
B.5 Programming=20 Errors and Limitations 80
B.5.1 Concave=20 Corner and Tool Radius Too Big (10 and 16) 81
B.5.2 Cannot=20 Turn Cutter Radius Comp on When On (5) 81
B.5.3 Cutter=20 Gouging (11) 82
B.5.4 Tool=20 Radius Index Too Big (15) 82
B.5.5 Two=20 G Codes Used from Same Modal Group (17) 82
B.6 First=20 Move into Cutter Compensation 82
Appendix C Sample=20 Programs 84
C.1 Sample=20 Simple Program 84
C.2 Sample=20 Program to Test Expressions 85
C.3 Sample=20 Program to Test Canned Cycles 86
Appendix D Interpreter=20 Software 88
D.1 Interpreter=20 Interfaces 88
D.2 Software=20 Files and Organization 89
D.3 Cyclic=20 Operation 91
D.3.1 Read,=20 Store, and Check 91
D.3.2 Execute=20 91
D.4 Interpreter-do-it=20 Functions 91
D.5 Interpreter-give-information=20 Functions 92
D.6 World-give-information=20 Functions 93
D.7 Interpreter=20 Function Call Hierarchies 95
D.8 Special=20 Topics 101
D.8.1 Interpreter=20 World Model 101
D.8.2 Block=20 Model 102
D.8.3 Expression=20 Evaluation 103
D.8.4 Parameter=20 Buffering 103
Appendix E Production=20 Rules for theRS274/NGC Language 105
E.1 Production=20 Language 105
E.2 Productions=20 105
E.3 Production=20 Tokens in Terms of Characters 107

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