Tip radius coefficient
| Symbol | ρaP0* |
|---|---|
| Unit | - |
| Attribute-ID | tip_radius_coefficient_rack |
| Numeric ID | 3061 |
| Value Type | PMDouble |
The tool tip radius cuts the root fillet rounding of the gear, thus it is a decisive factor for the tooth root bending stress. A fully rounded tool produces the smallest curvature in the tooth root fillet, thus the lowest notch effect and the lowest root bending stress.
The following input options are available:
- Full rounded tool tip (ρaP0,full)
- Tip radius coefficient (ρaP0*=ρaP0/mnP0)
- Tip radius (ρaP0)
| ρaP0,full | Full rounded tool tip |
| ρaP0 | Tip radius (smaller than full rounded) |
| mnP0 | Normal module of the rack reference profile |
Note: It is possible to optimize the tooth root geometry and thus further reduce the tooth root bending stresses compared to full rounding, see FVA 709 "Free tooth root geometry" (in German).