User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

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8 Cycles 8.2 Simple Fixed Cycles CIRCULAR POCKET MILLING G77/G78 TNC 360 Process • Circular pocket milling is a roughing cycle. The tool penetrates the workpiece from the starting position (pocket center). • The cutter then follows a spiral path at the programmed feed rate (see Fig. 8.10). The stepover factor is determined by the value of k (see POCKET MILLING cycle G75/G76: calculations). • The process is repeated until the programmed milling depth is reached. • At the end of the cycle the tool returns to the starting position. Required tool This cycle requires a center-cut end mill (ISO 1641) or a separate pilot drilling operation at the pocket center. Direction of rotation for roughing out Clockwise direction of rotation G77 Counterclockwise direction of rotation G78 Input data • SETUP CLEARANCE A • MILLING DEPTH B : DEPTH of the pocket • PECKING DEPTH C • FEED RATE FOR PECKING: Traversing speed of the tool during penetration. • CIRCLE RADIUS R : Radius of the circular pocket. • FEED RATE: Traversing speed of the tool in the working plane. Fig. 8.10: Tool path for roughing out C Fig. 8.11: Distances and infeeds with CIRCULAR POCKET MILLING Fig. 8.12: Direction of the cutter path A B F G78 G77 R 8-13
8 Cycles 8.2 Simple Fixed Cycles 8-14 Example: Milling a circular pocket Pocket center coordinates: X = 60 mm Y = 50 mm Setup clearance: 2 mm Milling depth: 12 mm Pecking depth: 6 mm Feed rate for pecking: 80 mm/min Circle radius: 35 mm Milling feed rate: 100 mm/min Direction of the cutter path: – CIRCULAR POCKET MILLING cycle in a part program %S814I G71 * ............................................................ Begin program N10 G30 G17 X+0 Y+0 Z–20 * ................................... Define workpiece blank N20 G31 G90 X+100 Y+100 Z+0 * N30 G99 T1 L+0 R+4 * .............................................. Tool definition N40 T1 G17 S2000 * .................................................. Tool call N50 G77 P01 –2 P02 –12 P03 –6 P04 80 P05 35 P06 100 * ................................................................... Cycle definition CIRCULAR POCKET MILLING N60 G00 G40 G90 Z+100 M06 * ............................... Retract the spindle, insert the tool N70 X+60 Y+50 M03 * .............................................. Move to starting position (pocket center), spindle ON N80 Z+2 M99 * .......................................................... Pre-positioning in Z to setup clearance, cycle call N90 Z+100 M02 * ...................................................... Retract tool and end program N9999 %S814I G71 * Y 50 Z 12 35 60 X TNC 360
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February 1994 HEIDENHAIN User's Man
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TNC Guideline: From workpiece drawi
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How to use this manual TNC 360 This
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Contents User's Manual TNC 360 ISO
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2 Manual Operation and Setup TNC 36
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4 Programming TNC 360 4.1 Editing P
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6 Subprograms and Program Section R
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8 Cycles TNC 360 8.1 General Overvi
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10 MOD Functions TNC 360 10.1 Selec
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1 Introduction 1.1 The TNC 360 1-2
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1 Introduction 1.1 The TNC 360 1-4
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1 Introduction 1.2 Fundamentals of
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1 Introduction 1.3 Switch-On 1-14 S
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1 Introduction 1.4 Graphics and Sta
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1 Introduction 1.4 Graphics and Sta
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1 Introduction 1.5 Programs Selecti
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2 Manual Operation and Setup 2.1 Mo
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2 Manual Operation and Setup 2.6 Me
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3 Test Run and Program Run 3.2 Prog
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3 Test Run and Program Run 3.2 Prog
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3 Test Run and Program Run 3.3 Bloc
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4 Programming 4.1 Editing Part Prog
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4 Programming 4.2 Tools TNC 360 Eac
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4 Programming 4.2 Tools Entering to
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4 Programming 4.2 Tools Calling too
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4 Programming 4.3 Tool Compensation
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4 Programming 4.3 Tool Compensation
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4 Programming 4.4 Program Creation
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4 Programming 4.5 Entering Tool-Rel
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4 Programming 4.6 Entering Miscella
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5 Programming Tool Movements 5.1 Ge
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Page 179 and 180: 8 Cycles 8.3 SL Cycles CONTOUR MILL
Page 183 and 184: 8 Cycles 8.4 Cycles for Coordinate
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Page 193 and 194: 9 External Data Transfer 9-2 The TN
Page 195 and 196: 9 External Data Transfer 9.3 Prepar
Page 197 and 198: 10 MOD Functions 10.3 Entering the
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11 Tables, Overviews, Diagrams 11-2
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User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

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