G02.1/G03.1: Spiral interpolation (circular threading B)
CW/CCW spiral interpolation: continuous helical motion with variable pitch; used in B threading and some lapping operations.
For reference only: syntax changes with the control, the post-processor and the machine parameters. Check the official manual and run a simulation before cutting. Legal notice.
- Family
- Interpolation
- Machine
- Milling, Turning, Mill-turn
- Risk
- High
- Example
- G02.1 X... Y... Z... F...
G02.1 X... Y... Z... F...Machine: Milling, Turning, Mill-turnRisk: High
Fanuc · Mitsubishi
- Fanuc: Requires option; Different from standard helical G02.
- Mitsubishi: Check active G list and step parameters.
Other codes in Interpolation
See the full list of G and M codesFrequently Asked Questions (FAQ)
What does G02.1/G03.1 mean in a CNC program?
CW/CCW spiral interpolation: continuous helical motion with variable pitch; used in B threading and some lapping operations. In the catalogue it appears as "Spiral interpolation (circular threading B)", within the Interpolation family.
Can you give me an example of G02.1/G03.1?
G02.1 X... Y... Z... F... — CW/CCW spiral interpolation: continuous helical motion with variable pitch; used in B threading and some lapping operations.
Which machines use G02.1/G03.1?
G02.1/G03.1 is used in: Milling, Turning, Mill-turn.
What should you watch out for with G02.1/G03.1?
High risk: a mistake here can cause a crash, a broken tool or an out-of-tolerance part. Simulate the program and dry-run it before cutting.
Related tools
CNC G-code Simulator
CNC IDE: editing with G/M tooltips, line inspector, conversion between controls and 2D/3D toolpath.
CNC Alarms Guide
CNC Alarms and Solutions Guide. Enter the error code or symptom to find the cause and how to repair it at the machine.
Calculate cycle time
Estimate CNC turning and milling cycle time from G-code. Calculate parts per hour with a breakdown of cutting, rapids, canned cycles and tool changes.