How to Turning, Facing, Parting, Threading Group Programming for CNC Lathe Machine | G-Code Tutorial

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In this video, we will cover the group programming techniques for CNC lathe machines, focusing on four fundamental operations:

✅ Turning
✅ Facing
✅ Parting (Cut-off)
✅ Threading

This tutorial is perfect for students, CNC operators, and anyone wanting to learn how to write efficient G-code programs for lathe machines used in modern manufacturing.

✅ What You’ll Learn in This Tutorial:
✔️ CNC Lathe Machine Overview
✔️ Tool Setup & Tool Numbering
✔️ G-code for Facing Operation
✔️ G-code for Turning Operation (Roughing & Finishing)
✔️ G-code for Parting/Cut-off Operation
✔️ G-code for Threading (External/Internal)
✔️ Group programming method with Tool Group Call
✔️ Toolpath planning for multiple operations
✔️ Coordinate system and zero setting
✔️ Example of full group program with multiple tools
✔️ Safety commands (G40, G41, G42, G28, G90, etc.)

🛠️ CNC G-Code Commands Covered:
G00 – Rapid Traverse

G01 – Linear Interpolation

G92 / G76 – Thread Cutting Cycle

G96 / G97 – Constant Surface Speed / RPM

G50 – Spindle Speed Limit

T0101, T0202... – Tool Call & Offset

M03 / M05 – Spindle On/Off

M08 / M09 – Coolant On/Off

G28 – Return to Reference

G40 / G41 / G42 – Cutter Compensation

G90 / G91 – Absolute / Incremental Positioning

🔩 Operations Breakdown:
🔹 Facing – Smoothly clean the front of the part
🔹 Turning – Reduce the outer diameter with roughing and finishing passes
🔹 Parting (Cut-off) – Safely remove the finished component
🔹 Threading – Create precision threads with G76 or G92 cycles
🔹 Grouping – Combine all operations under one program using separate tool groups (e.g., T0101 for turning, T0303 for parting)

📘 CNC Sample Code Snippet (Overview):
gcode
Copy
Edit
O1001
G21 G90 G40
T0101 (Turning Tool)
G96 S200 M03
G00 X100 Z5
G01 Z0 F0.2
... (Turning Code)
T0202 (Facing Tool)
... (Facing Code)
T0303 (Parting Tool)
... (Parting Code)
T0404 (Threading Tool)
... (Threading Code)
M30
👨‍🏫 Who Should Watch This:
CNC Machine Operators

Polytechnic & BSc Engineering Students

Diploma in Mechanical Engineering

Technical Institute Students

Job Seekers for Factory/Industry

CNC Freelancers and Job Holders

Industrial Machine Programmers

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Master Turning, Facing, Parting, and Threading group programming for CNC Lathe Machines and start your journey to becoming a professional CNC machinist.