Distance from datum line to measuring line
| Symbol | PBML |
|---|---|
| Unit | mm |
| Attribute-ID | distance_tool_profile_basic_line_to_measuring_line_rack |
| Numeric ID | 3074 |
| Value Type | PMTechValue |
When this option is activated, the tool dimensions with measuring line are specified according to DIN 58412.
The following input options are available:
- Distance from datum line to measuring line (PBML) or module-related (PBML*=PBML/mnP0)
- Measurement (bz0) or module-related (bz0*=bz0/mnP0)
- Tooth thickness at the measuring line (s0)
sP0=0.5·π·mnP0 (corresponds to half the pitch)
PBML=bz0/sin(αnP0) with bz0=((0.25·π·mnP0)-(0.5·s0))·cos(αnP0)
| sP0 | Tooth thickness at the reference line of the rack reference profile acc. to DIN 3960 (DIN 3972) |
| s0 | Tooth thickness at the measuring line of the rack reference profile acc. to DIN 58412 |
| PBML | Distance from datum line to measuring line |
| bz0 | Measurement |
| αnP0 | Normal pressure angle of the rack reference profile |
| hfP0 | Dedendum of the rack reference profile |
| haP0 | Addendum of the rack reference profile |
| mnP0 | Normal module of the rack reference profile |
For more information, see STplus 8.3.1 p.178 (in German)