9780071713320

Master CNC macro programmingCNC Programming Using Fanuc Custom Macro Bshows you how to implement powerful, advanced CNC macro programming techniques that result in unparalleled accuracy, repeatability, flexible automation, and enhanced productivity. Step-by-step instructions begin with basic principles and gradually proceed in complexity. Specific descriptions and programming examples follow Fanuc's Custom Macro B language with reference to Fanuc 0i series controls. By the end of the book, you will be able to develop highly efficient programs that exploit the full potential of CNC machines.Coverage includes: Variables and expressions Types of variableslocal, global, macro, and system variables Macro functions, including trigonometric, rounding, logical, and conversion functions Branches and loops Subprograms Macro call Complex motion generation Parametric programming Custom canned cycles Probing Communication with external devices Programmable data entry

S. K. Sinha earned his Ph.D. in mechanical engineering from the Indian Institute of Technology in 1993. He has 18 years of teaching experience in CNC programming and has been working in the CNC area for the past 10 years.

Preface	p. xi
Acknowledgments	p. xiii
Introduction	p. 1
Part Programming Techniques	p. 2
Conventional Part Programming	p. 2
Conversational Part Programming	p. 3
Part Programming Using CAM Software	p. 3
Macro Programming	p. 4
Comparison of the Four Methods	p. 4
Certain Applications of Macro Programming	p. 4
Complex Motions	p. 5
Families of Parts	p. 5
Custom Canned Cycles	p. 6
"Intelligent" Programs	p. 7
Probing	p. 7
Machine Status Information/Manipulation	p. 8
Communication with External Devices	p. 8
Does My Machine Have Macro Capability?	p. 9
Aim of the Present Text	p. 11
How to Use This Text	p. 11
Variables and Expressions	p. 13
Macro Variables	p. 13
Macro Expressions	p. 13
Assigning a Value to a Variable	p. 16
Display of Variables	p. 18
Real versus Integer Values	p. 19
Undefined Variables	p. 22
Null Variables in Word Addresses	p. 22
Null Variables in Arithmetic Operations	p. 23
Null Variables in Conditional Expressions	p. 23
A Simple Use of Macro Programming Features	p. 24
Retaining Programs in MDI Mode	p. 24
Types of Variables	p. 27
Local and Global Variables	p. 27
Effect of System Reset on Macro Variables	p. 28
Levels of Local Variables	p. 29
Range of Values Stored in Variables	p. 33
System Variables	p. 35
System Variables versus System Parameters	p. 35
System Variables on Fanuc 0i Series Controls	p. 36
Displaying System Variables	p. 36
Interface Signals	p. 37
System Variables for Input Interface Signals	p. 40
System Variables for Output Interface Signals	p. 40
Geometry and Wear Offset Values	p. 40
Workpiece Coordinate System Shift Amount	p. 43
Macro Alarms	p. 44
Time Information	p. 45
Automatic Operation Control	p. 45
Execution Pause	p. 48
Mirror Image Information	p. 48
Number of Machined Parts	p. 48
Modal Information	p. 49
Current Tool Position	p. 52
Work Offset Values	p. 55
Macro Functions	p. 57
Types of Macro Functions	p. 57
Priority of Operations in Arithmetic Expressions	p. 57
Priority of Operations in Boolean Expressions	p. 58
Effect of Order of Calculations	p. 58
Nesting of Brackets	p. 59
Arithmetic Operations	p. 59
Division versus Block-Skip Function	p. 60
Trigonometric Functions	p. 60
Rounding Functions	p. 63
ROUND, FIX, and FUP	p. 64
Miscellaneous Functions	p. 67
SQRT	p. 67
ABS	p. 67
LN	p. 68
EXP	p. 68
Arbitrary Exponent of a Number	p. 69
Logical Functions	p. 69
Bitwise Functions	p. 69
Boolean Functions	p. 71
Bitwise versus Boolean Operations	p. 72
Enabling Boolean Operations	p. 73
An Application Example of Bitwise Operation	p. 73
Conversion Functions	p. 75
Branches and Loops	p. 79
Unconditional Branching	p. 79
Conditional Branching	p. 80
Conditional Execution of a Single Macro Statement	p. 93
Execution in a Loop	p. 94
Arithmetic Operations on Macro Variable Numbers	p. 103
Methods of Zero Shift	p. 106
Machine Coordinate System	p. 107
External Workpiece Coordinate System	p. 107
G54-G59, G54.1 P1-P48 Workpiece Coordinate Systems	p. 108
Zero Shift by Manipulating Offset Distances	p. 109
Zero Shift through System Variables	p. 109
Work Offset Display on a Milling Machine	p. 110
System Variables for Various Work Offset Values	p. 111
Zero Shift through a Program	p. 111
Nested WHILE Statement	p. 115
Review of Subprograms	p. 121
Introduction	p. 121
What Is a Subprogram?	p. 121
Why Is It Used?	p. 121
Subprograms versus Subroutines of a Conventional Computer Language	p. 122
Subprogram Call	p. 122
Multiple Call of a Subprogram	p. 125
Subprogram Nesting	p. 132
Macro Call	p. 137
Introduction	p. 137
Macro versus Subprogram	p. 137
Macro Call	p. 138
Simple Call (G65)	p. 138
Modal Call (G66)	p. 141
Call with User-Defined G-Code	p. 145
Call with User-Defined M-Code	p. 147
Subprogram Call without Using M98/M198	p. 148
Subprogram Call Using an M-Code	p. 148
Subprogram Call Using a T-Code	p. 150
Argument Specification	p. 151
Argument Specification I	p. 152
Argument Specification II	p. 153
Mixed Argument Specification	p. 154
An Example of a G-Code Macro Call with Arguments	p. 155
Processing of Macro Statements	p. 163
What Is Buffering?	p. 163
How Many Blocks Are Buffered?	p. 163
When Are the Buffered Blocks Processed?	p. 163
Processing When the Next Block is Not Buffered	p. 163
Processing in Radius Compensation Cancel (G40) Mode	p. 164
Processing in Radius Compensation Mode (Case 1)	p. 164
Processing in Radius Compensation Mode (Case 2)	p. 164
Effect of Buffering of Macro Statements on Program Execution	p. 165
Complex Motion Generation	p. 167
Introduction	p. 167
Arc with Uniformly Varying Radius	p. 167
Helical Interpolation with Variable Radius	p. 175
Parabolic Turning	p. 181
Roughing Operation	p. 184
Step-Removal Operation	p. 184
Turning a Sine Curve	p. 188
Parametric Programming	p. 193
Introduction	p. 193
Locator Pin	p. 194
Bolt Holes on a Flange	p. 200
Custom Canned Cycles	p. 207
Introduction	p. 207
Deep-Hole Peck Drilling on a Lathe	p. 207
Drilling with Reducing Peck Lengths on a Milling Machine	p. 215
Probing	p. 223
Introduction	p. 223
Skip Function on a CNC Machine	p. 224
Probing a Pocket	p. 224
Finding Center of a Hole	p. 228
Finding Angle of an Edge	p. 231
Adjusting Wear Offset	p. 233
Communication with External Devices	p. 237
Introduction	p. 237
Switching Principle	p. 237
Input Types and Wiring	p. 239
Connector Pin Assignment	p. 240
Discrete Sensors for Sourcing/Sinking PLC Inputs	p. 244
Output Types and Wiring	p. 246
Programmable Data Input	p. 251
Introduction	p. 251
Data Input for WCS Offset Distances	p. 252
Data Input for Additional WCS Offset Distances	p. 253
Data Input for Compensation Values on a Milling Machine	p. 254
Data Input for Compensation Values on a Lathe	p. 255
Data Input for Parameter Values	p. 258
A Limitation of G10 L50 Method	p. 262
Appendix A List of Complex Macros	p. 263
Appendix B List of Parameters	p. 265
Index	p. 267
Table of Contents provided by Ingram. All Rights Reserved.

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CNC Programming using Fanuc Custom Macro B

0071713328

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