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shown in Figure 9. In the case of a single axis pulsing, the feed angle in items
MP5 and MP6 are zero and are not applicable.

Further MicroPulse optimization steps can be conducted by changing the pulse
axis in item MP1 and by using different amounts for items MP3 and MP4.

17.6 Summary

MicroPSF features are developed to reduce the tonality. This is not the same as
reducing the motion error amplitude or the harmonic frequency levels of an FFT.
Although in many cases of MicroShift, the levels of higher harmonic frequencies
are reduced, this is not always the case in MicroForm. More frequently the audible
results from a roll testing, for example with a microphone and a dB(A) evaluation,
confirm the improvement achieved by the MicroForm flank surface scattering.

The guidelines given in this chapter should help to find a noise optimized condition
with a reduced tonality. The iteration steps can be made by side grinding on con-
vex and concave flanks. A 0.05mm setover to either side is sufficient and roll test-
ing with a larger than nominal backlash is possible. However, the roll tester must
be programmed for positioning pinion and gear at the nominal zero position, in-
stead of the correct backlash position.

17.7 Literature

[1] Stadtfeld, H.J. “Psychoacoustic Methodology for the Noise Reduction of
Bevel Gears”, AGMA, Fall Technical Meeting, Columbus, OH,
October 2017

[2] Strunk, S. “Surface Structure Shift for Ground Bevel Gears”, AGMA,
Fall Technical Meeting, Pittsburg, PA, October 2016

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