Utilized addendum (left)
| Symbol | hFaP0 |
|---|---|
| Unit | mm |
| Attribute-ID | utilized_addendum_left_flank |
| Numeric ID | 201158 |
| Value Type | PMTechValue |
A protuberance can be defined for the tool to create an undercut on the gear. This reduces the risk of a machining notch during finishing.
The following input options are available:
- Protuberance height (hprP0) or module-related (hprP0*=hprP0/mnP0)
- Utilized addendum (hFaP0) or module-related (hFaP0*=hFaP0/mnP0)
- Protuberance amount (prP0) or module-related (prP0*=prP0/mnP0)
- Protuberance angle (αprP0)
| prP0 | Protuberance amount on the rack reference profile |
| hprP0 | Protuberance height on the rack reference profile |
| hFaP0 | Utilized addendum on the rack reference profile |
| αprP0 | Protuberance angle on the rack reference profile |
| SP0 | Tooth thickness at the reference line of the rack reference profile |
| mnP0 | Normal module of the rack reference profile |
In the literature, it is often recommended to avoid undercutting, as it weakens the tooth root cross-section and reduces the tooth root load carrying capacity. In practice, protuberance tools are used to avoid machining notches in the tooth root. These notches can cause a significant increase in stress and reduce the tooth root load carrying capacity significantly. The influence of the notch can be analyzed in the Workbench using the "BEM tooth root stress" local calculation method.