Gear Measurement
Calculation of the diameter of measuring pins d_{M} for the worm and the diameter of measuring balls d_{B}
for wormwheel. Input of rounded values for this diameters, but they have to be as close as possible to the calculated values.
The application calculates: mean normal chordal thickness with tolerance in ± notation, diametral dimension over three pins M_{d1}
for the worm, diametral dimension over two balls M_{d2} for wormwheel with respective tolerance. The backlash to be
expected is also calculated. The user can compose a measuremnt sheet by selection of options with check boxes. A composition can
be stored as default for the next calculations.
Materials for worm and wormwheels
The application provides a dialog box for management of materials for gears. According the standard ISO 63365
the endurance contact stress values and endurance bending stress values can be determined in function of the tooth flank hardness using an
equation of straight line σ_{H,F} = Ax + B where x stands for the flank hardness, A for the slope coefficient and B
for the segment on the yaxis. The data for wormwheel materials are derived from the text book NiemannWinter Maschinenelemente Band III.
Input for a worm gear pair requires input of material separately for worm and wormwheel, the material quality grade and the hardness of tooth flank.
With the equation of the straight line the endurance contact stress value σ_{Hlim} and the endurance bending stress
value σ_{Flim} are determined in function of the tooth flank hardness.
Load
Input of the load can be done with one of the following combinations:

Power on worm 
P_{1} 
kW 
and 
rotational frequency worm 
n_{1} 
Hz 

Torque on worm 
T_{1} 
Nm 
and 
rotational frequency worm 
n_{1} 
Hz 

Torque on wheel 
T_{2} 
Nm 
and 
rotational frequency wormwheel 
n_{2} 
Hz 
Input with dialog:
Bearing Points
Input of location of bearing points A and B and mesh point X with cylindrical coordinates as presented in
following dialog box:
Worm Gear Forces
Calculation of transverse tangential force F_{t}, the radial force F_{r} and the axial force
F_{a} in the mesh point X and the reaction forces in the bearings A and B. The application checks if transmission is
self locking.
Calculation results are displayed on screen in a table as shown in following window:
The calculation results may also be exported in a .txt or a .htmlfile. To have a look on a complete
forces calculation report, click on Calculation Report Forces to open
it in a blank page.
Go to next web page for load carrying capacity.