Cubit 16.12 User Documentation
If healing fails to convert spline surfaces to analytic ones fails, the simplification tolerance can be modified and healing re-run:
healer default simplifytol .1
healer autoheal body 1
Spline surfaces can also be forced into an analytic form (use this command with caution):
Healer Force {Plane|Cylinder|Cone|Sphere|Torus} Surface <id_list> [Keep]
The Keep option will retain the original body and generate a new body containing analytic surfaces. Note: Spline curves can be found using entity filters:
Execute Filter Curve Geometry_type Spline