Page 108 - Gear Technology Solutions

Figure 5: Slot with two adjacent teeth and nominal data points
and normal vectors

The tangent vector of the slot chosen to obtain the correct stock division is rotated
into a vertical plane (X-Z-plane in Figure 6) by rotating the gear around its Z-axis.
The rotation to the approximate vertical position is made with a leveling tool, which
is inserted into the slot. Then the tool is moved in jog mode into the slot such that
the two adjacent cutting edges just contact the two adjacent topland corners at
mid face. The found position has an X-, Y- and Z-component and a work axis posi-
tion angle. These stock division offset data are transferred automatically into the
summary of the chamfering program.

Depending on the tool diameter, the contact point between tool and topland
corner of the convex flank is shifted towards the toe and the contact point be-
tween tool and topland corner of the concave flank is shifted towards the heel.
Such a shift is acceptable if the distance between the contact points does not
exceed 30% of the width of the slot. The chamfer correction features can be
used to optimize the chamfer geometry if a large shift between the contact
points leads to distorted chamfer geometry. It is recommended to utilize the
smallest possible chamfer tool diameter in order to avoid or minimize contact
point shift.

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