Page 188 - Root Cause Failure Analysis
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176 Root Cause Failure Analysis
+ HELIX,
ANGLE
Figure 14-5 Illustrating the angle at which the teeth are cut (Neale 1993).
It is very important to note that the helix angle may be on either side of the gear’s cen-
ter line. Or, if compared to the helix angle of a thread, it may be either a “right-hand’
or “left-hand” helix. Figure 14-7 illustrates a helical gear as viewed from opposite
sides. A pair of helical gears must have the same pitch and helix angle but be of oppo-
site hand (one right hand and one left hand).
Figure 14-6 Helical gear and its parts (95/96 Product Guide).
