How Are You Dealing with the Bias Error in Your Helical Gears?

摘要

The paper initially defines bias error ("the twisted tooth phoneme"). Using illustrations we explain that bias error is a by product of applying conventional radial crowning methods to produced crowned leads on helical gears. The methods considered are gears that are finished, shaped, shaved, form and generated ground. The paper explains why bias error occurs in these methods. It then addresses what techniques are used to limit/eliminate bias error. Some times there may be a possibility to apply two methods to eliminate bias error. In those cases the pros/cons of these methods will be reviewed. Profile and lead inspection charts will be used to detail bias error and the ability to eliminate it. The paper details the simultaneous interpolation of multiple axes in the gear manufacturing machine to achieve the elimination of bias error. It also explains that the CNC machine software can be used to predict bias error. Equally important that it could be used to create an "engineered bias correction" to increase the load carrying capacity of an existing gear set.