Page 32 - Gear Technology Solutions

after each coordinate measurement the tooth thickness deviation value from
the CMM output protocol is added to the nominal value given in the dimension-
sheet, then a precise result of the actual normal chordal tooth thickness will be
obtained.

1.11 Summary

In an effort to update the Dimension-Sheet the following calculations have
been added:
► Core Diameter at the Pinion Heel
► Strength Factors
► Back Driving Factor
► Efficiency
► Bearing Load in Axial and Separating Direction
► Tooth Thickness Calculation and Output

The new output compared to the traditional Dimension-Sheet is the Core
Diameter at Pinion Heel, the Back Driving Factor and the Normal Chordal
Tooth Thickness Calculation and output. The latter presents a significant step
forward. CMM measurements of the tooth thickness have been claimed for
many years not to be compatible with the definitions of national and
international standards. A tooth thickness angle between the center points of
grids with edge reductions is difficult and impractical to convert to a normal
chordal tooth thickness. In this manual it is described that changes in the flank
generation program have been made, which allow to exchange the original
grid center point with either the pitch point or any user chosen point. This
especially prepared tooth thickness point and the corresponding tooth
thickness angle allows the precise conversion in normal chordal tooth
thickness. This calculation is performed in the UNICAL Dimension-Sheet
program, and the tooth thickness dimensions are printed in the Dimension-
Sheet output.

1.12 Literature

[1] N.N. “Explanations for Dimension Sheets”, Gleason Manual,
November 1965

[2] Stadtfeld, H.J. “Manual for SRH Design Calculation with UNICAL”,
Donnan, R.T. Company Publication, The Gleason Works, Rochester,
New York, February, 2015

[3] N.N. “Surface Durability – Pitting Formulas for Bevel Gear Teeth”,

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