Page 97 - Gear Technology Solutions

Figure 5: Co-prime hunting tooth ratio 11x31

7.3 Is the Influence of the Hunting Tooth Theoretical or Reality?

It is stated in older literature that a hunting tooth ratio is helpful in the case of
lapped gears. However, in the case of not heat treated or ground gearsets, the
older literature points out that integer ratios are preferred. As a reason it is
mentioned that gearsets with integer ratios are easier to inspect, test and as-
semble accurately [2]. This rule is still applied today for precision actuation with
moderate to low load. The following sections will reveal that for power trans-
missions the effect of break-in is an extremely important factor which has a key
influence on the operating performance of the transmission during its lifetime.
However, if the break-in improves or worsens the performance of a power
transmission depends on the optimal interaction between all teeth, which is
only given with a hunting tooth ratio.

Figure 6: Single flank graphic after grinding

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