Unknown Pressure Angle? Two Span Measurements Are All You Need.
When reverse-engineering existing cylindrical gear pairs or involute splines, you may know the gearbox and have several measurement values available, but the pressure angle is unknown.
With the new Re-Engineering function in eAssistant, the pressure angle can now be reliably determined directly from two span measurements. All you need is one measurement using the ideal number of teeth to span (suggested by the eAssistant calculation module) and a second measurement with one tooth more or one tooth less.
This provides an important geometry parameter quickly and reproducibly - creating a solid basis for the further reconstruction and redesign of involute gears.
The function is available directly via the calculator button next to the pressure-angle input field in the Single Gear, Cylindrical Gear Pair, Planetary Stage, and Involute Spline modules.
Practical tip: The pressure angle can be entered not only in decimal degrees, but also directly in degrees, minutes, and seconds. Simply click on the unit label.
Image: Original photo by Dirk Gräfe, Zahnradfabrik Kautz; modified by GWJ Technology. Used with kind permission.