Consider machining allowance
| Symbol | - |
|---|---|
| Unit | - |
| Attribute-ID | consider_machining_allowance |
| Numeric ID | 16716 |
| Value Type | PMBoolean |
If this option is activated, then a machining allowance on the tool acc. to DIN 3972 is used.
This machining allowance on the tool (p) is in addition to the machining allowance (q) possibly specified on the gear wheel.
At the height of the profile reference line, the tooth thickness of the tool is equal to its tooth gap width when dimensioning according to DIN 3972 (finish machining I+II). When dimensioning according to DIN 3972 (pre-machining III+IV), the tool-internal machining allowance (p) on the tool at the level of the profile reference line results in a greater tooth gap width than tooth thickness.
The specifications of the tool heights, such as the addendum, remain unchanged.
The following input options are available:
- Machining allowance (p)
- Machining allowance coefficient (p*=p/mnP0)
sP0=0.5·π·mnP0 (is equal to half pitch)
s0=0.5·π·mnP0-2·p·cos(αnP0)
| sP0 | Tooth thickness at the reference line of the rack reference profile acc DIN 3972 (finish machining I+II) |
| s0 | Tooth thickness at the reference line of the rack reference profile acc DIN 3972 (pre-machining III+IV) |
| p | Machining allowance on the rack reference profile |
| spr | Residual fillet undercut on the gear (prP0-p) |
| prP0 | Protuberance of the rack reference profile |
| hprP0 | Protuberance height of the rack reference profile |
| hFfP0 | Utilized dedendum of the rack reference profile |
| hfP0 | Dedendum of the rack reference profile |
| haP0 | Addendum of the rack reference profile |
| αnP0 | Normal pressure angle of the rack reference profile |
| mnP0 | Normal module of the rack reference profile |
For further information see DIN 3972 or STplus 8.3.1 p.179 (in German)