The document discusses the coordinate system and tooling used on lathe machines. It describes the zero point, dimensions, and typical tooling like turning, boring, grooving, and threading tools. It also lists the common G-codes and M-codes used in CNC lathe programming to control functions like spindle speed, feed rate, coordinate systems, and cycles for operations like facing, roughing and finishing.

1. Lathe Coordinate System

2. Workpiece Zero Point
• Coordinate system zero point is
– centerline of spindle (X)
• with normal spindle rotation, machining is in +X
– finish face of part (Z)
• Machining is in –Z if Z=0 is finish face
• Second ops may use back side of part as Z=0
• X dimensions are diameter, not radius

22. Lathe Tooling
• Turning
• Boring
• OD Grooving
• ID Grooving
• Face Grooving
• OD Threading
• ID Threading

23. CNC Lathe Programming

24. G-Codes for Turning
Limit spindle speed
G50
Return to reference point
G28
Metric system
G21
Inch system
G20
Dwell
G04
CCW Circular interpolation
G03
CW Circular interpolation
G02
Linear interpolation (feeding)
G01
Rapid positioning
G00

25. G-Codes for Turning
Feed per revolution mode
G99
Feed per minute mode
G98
Constant spindle speed mode
G97
Constant surface speed mode
G96
Threading cycle
G76
Facing cycle
G72
Roughing cycle
G71
Finishing cycle
G70
Select work coord system #1
G54

26. M-Codes for Turning
Program end
M30
Open chuck
M11
Close chuck
M10
Stop coolant
M09
Start coolant
M08
Stop spindle
M05
Start spindle (reverse rotation)
M04
Start spindle (normal rotation)
M03
Opt. Program Stop (panel controlled)
M01
Program Stop
M00