Fusion Y-Axis Lathe Post Processor
A Y axis lets a lathe mill true flats, pockets and off-centre holes. We build Fusion posts for Y-axis turning centres with correct plane selection, C-axis positioning, Y-axis limits and safe changes between turning and milling.
True milling on a turning centre
Without a Y axis, a lathe can only mill features that pass through the centreline or that polar and cylindrical interpolation can produce. A Y axis moves the live tool above and below centre, so the machine can mill flat-bottom pockets, keyways, off-centre holes and square shoulders in true Cartesian coordinates, often with better finish and accuracy.
ENGIMANDI builds Fusion Y-axis lathe posts that choose the right plane for each operation (face or side milling), position the C axis and clamp it, output X, Y and Z milling moves with correct diameter or radius handling, respect the Y-axis travel limits, and use the machine's specific codes for entering and leaving milling mode. When needed, we combine Y-axis work with polar and cylindrical interpolation in the same program.
Read our guide on Fusion mill-turn posts and live tooling post processors.
What you get
- Face & side plane selection
- C-axis positioning & clamping
- X, Y, Z milling output
- Off-centre drilling & tapping
- Y-axis travel checks
- Milling mode codes
- Combined with C-axis work
- Machine simulation
Y-axis post features
Off-centre work done correctly.
Plane Selection
G17, G18 and G19 selected for face, turning and side milling.
Y-Axis Motion
Cartesian milling with the Y axis, including arcs in the right plane.
C Positioning
C-axis indexed and clamped for stable milling.
Travel Limits
Y travel checked with clear warnings when a feature is out of reach.
Cycles
Off-centre drilling and tapping cycles for live tools.
Mode Changes
Safe transitions between turning and Y-axis milling.
Y-axis post stack
Machines and controls.
Typical projects
- Keyways milled on shafts in one setup
- Flat-bottom pockets on a valve body
- Off-centre holes in hydraulic parts
- Haas ST-20Y with live tools
- Doosan Puma MY post with sub-spindle
- Square shoulders on turned parts
How we build Y-axis posts
Machine
Axes, travels and modes.
Develop
Planes, motion and cycles.
Simulate
Check reach and collisions.
Prove
Test features on your lathe.
Support
Ongoing help.
Y-axis post questions
Why use Y-axis milling instead of polar interpolation?
Y-axis milling gives true flat surfaces and square features, often with better finish. Polar interpolation is useful when there is no Y axis or for certain face features.
Is X programmed as a diameter during milling?
It depends on the controller and mode. We follow your machine's rules exactly.
What if a feature is beyond Y travel?
The post warns during posting, and we can suggest alternative strategies.
Do you support B-axis lathes too?
Yes. See mill-turn posts for B-axis multi-tasking machines.
Can the post work with a sub-spindle?
Yes. Y-axis milling on the sub-spindle is supported where the machine allows it.