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Gear Geometry

For the case Gleason Spiral Metric System, the tooth geometry is being defined by eight independent parameters:

1 Outer transverse module met
2 Number of teeth of pinion z1
3 Number of teeth of gear z2
4 Face width gear b2
5 Mean spiral angle gear βm2
6 Pinion profile shift coefficient xh1
7 Pinion thickness modification coefficient xs1
8 Shaft angle Σ

Input is done with following dialog box:

Geometry Dialog

Input of gear outer pitch diameter de2 is also requested but as a dependent parameter de2 = met z2. Common practice is to round this quantity while the spiral angle is slightly adapted. In the Gleason Metric System, the tooth form is modified by profile height shift and thickness modification coefficients for number of teeth less than 17, while in the Inch System the tooth proportions are determined width expressions from which the factors are derived from a table. Input of spiral hand, selection of uniform bottom clearance and back and front plane of teeth.

Input of face mill cutter radius rc0 with a dialog box for management of face mill tools. A list of standard Gleason tools is supplied with the program. Input of distances from apex point with next dialog:

Geometry Distances Dialog

Results of calculation in next window:

Geometry Output Table

With a mouse click, the results of the calculation can be exported in a text- or a html file. The html file can be viewed by a browser. Click here to open a Calculation Report Geometry in a blank page.

Go to the next web page for gear forces.