Fusion Rotary Axis Post Processor
Rotary axes are where posts most often go wrong: wrong direction, unexpected full turns, hitting limits mid-cut or forgetting to clamp. We build and fix Fusion posts so A, B and C axes move correctly on rotary tables, trunnions and heads.
Getting rotary motion right
A rotary axis has more settings than a linear one. Which axis is it (A, B or C), and around which linear axis does it turn? Is it on the table or the head? Does positive rotation match the machine's convention? Is it continuous or limited? Should it take the shortest path, or always rotate one way? Does it need clamping? Does the control expect degrees per minute or inverse time feed during simultaneous moves?
ENGIMANDI configures and codes rotary axes in Fusion posts. We define each axis in the machine configuration with correct direction, range and resolution, set preferred solutions and rewind behaviour at limits, add clamp and unclamp codes, handle wrapped (cylindrical) toolpaths on 4th axes, and output feeds the control expects. We verify everything in Fusion machine simulation and on the machine.
Read rotary table post processors, rotary axis limits and rewind logic and inverse time feed for multi-axis.
What you get
- A, B & C axis definition
- Table or head rotaries
- Direction & sign conventions
- Shortest path or one-way
- Limits & rewind logic
- Clamp & unclamp codes
- Wrapped toolpaths
- Inverse time or DPM feeds
Rotary axis features
Every rotary configuration.
Rotary Tables
4th axis tables and trunnion rotaries on the table side.
Rotary Heads
Tilting and rotating heads on the spindle side.
Path Choice
Shortest path, one-way and preferred solutions.
Rewinds
Safe retract and unwind when limits are reached.
Clamping
Clamp for indexed cuts, unclamp for continuous motion.
Wrapping
Cylindrical wrapped toolpaths on a 4th axis.
Rotary axis stack
Machine configuration and post logic.
Typical projects
- A-axis direction reversed on a VMC
- C-axis unwinding mid-program
- B-axis limit hits on a trunnion
- Clamp missing on indexed work
- Wrapped engraving on a cylinder
- Feed too slow on rotary moves
How we set up rotaries
Measure
Axis type, direction and limits.
Configure
Machine configuration.
Code
Clamps, rewinds and feeds.
Simulate
Fusion machine simulation.
Prove
Careful machine trials.
Rotary axis questions
Why does my rotary spin the wrong way?
Usually the axis direction in the post or machine definition does not match the machine. We correct the definition.
Why does the table make a full turn?
Often a path or range setting. We set preferred solutions and ranges to avoid unwanted turns.
What is a rewind?
When a limited axis reaches its limit, the tool must retract so the axis can unwind. The post can do this safely.
Do we need inverse time feed?
Many controls prefer it during simultaneous rotary moves. We use what your control expects.
What about 5-axis?
See 5-axis posts and TCP/RTCP posts.