Page 373 - Gear Technology Solutions

Figure 20: A3F download file, part cut with 12° cutter slot
inclination and 3-face blade

It became evident during a theoretical study of the cause of flank twist and
length crowning that the side rake angle and top rake angle are only indirect
parameters which have limited significance to the flank twist. The investiga-
tions resulted in the acknowledgement that the effective cutting edge hook an-
gle is the sole blade feature which causes the flank surface twist. However, the
theoretical investigations and the verification in practical cutting trials also
showed that the flank twist is minimized, if the effective cutting edge hook an-
gle is selected between 0° and +1°.

Figure 21: Standard CAGE download file, part cut with 12° cutter slot inclina-
tion and 3-face blade with bade calculation after software revision

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