When using a lathe turning facing cycle in Fusion 360 Manufacturing, the primary feeds and speeds are defined in the Tool tab. In the Passes tab, roughing and finishing parameters can be defined, including a separate finish step‑over and finish feed rate. However, while the finish feed can be adjusted, there is currently no way to independently adjust surface speed (CSS or RPM) for the finishing pass.
For example, if facing 3.5 mm off a part made from 4140, the roughing parameters might be set in the Tool tab to a surface speed of 150 m/min with a feed of 0.25 mm/rev. In the Passes tab, the roughing step‑over could be set to 1.5 mm, with a finishing step‑over of 0.5 mm and a finishing feed of 0.15 mm/rev to slow the cut and improve surface finish. This allows control of feed rate for the finish pass, but for optimal surface finish it is often desirable to increase surface speed during the finishing cut. At present, this cannot be done within the same facing operation.
The only current workaround is to create a separate facing operation purely for the finish pass, duplicating geometry, setup, and tooling. This adds unnecessary steps, increases programming time, and clutters the toolpath list for what is a very common turning requirement.
It would be highly beneficial to add the ability to override surface speed (CSS or RPM) for the finishing pass directly within the Passes tab of lathe facing operations, and ideally other turning cycles as well. This would result in cleaner and more efficient toolpaths, reduced setup and programming time, improved control over surface finish, and better alignment with real‑world lathe machining practices.
