M17/M18: Turret indexing

M-codes associated on some lathes with turret indexing or turret functions.

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: Lathe
Machine: Turning, Mill-turn
Risk: High
Example: M17 / M18

M17/M18

Lathe

Turret indexing

E.g.:

M17 / M18

Machine: Turning, Mill-turnRisk: High

Haas · Fanuc

Haas: In Haas lathes it can refer to forward/reverse turret rotation.
Fanuc: Function dependent on the machine manufacturer.

Other codes in Lathe

G50 Lathe RPM limiter M21/M22 Tailstock advance/retract M23/M24 Threaded chamfer exit M35/M36/M37 Parts catcher G7/G8 Diameter/radius mode around lathe M25-M29 Bar feeder, parts catcher and lathe auxiliaries M31/M32 Chuck bypass / lathe auxiliary M53-M56 Steady rest and tailstock clamp/unclamp

See the full list of G and M codes

Frequently Asked Questions (FAQ)

What does M17/M18 mean in a CNC program?

M-codes associated on some lathes with turret indexing or turret functions. In the catalogue it appears as "Turret indexing", within the Lathe family.

Can you give me an example of M17/M18?

M17 / M18 — M-codes associated on some lathes with turret indexing or turret functions.

Which machines use M17/M18?

M17/M18 is used in: Turning, Mill-turn.

What should you watch out for with M17/M18?

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.

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