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How Are You Dealing with the Bias Error in Your Helical Gears - May 2009

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Archive > 2009 > May 2009 > How Are You Dealing with the Bias Error in Your Helical Gears

The article "How Are You Dealing with the Bias Error in Your Helical Gears" appeared in the May 2009 issue of Gear Technology.

Summary
This paper initially defines bias error—the “twisted tooth phenomenon.” 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 and offers techniques used to limit/eliminate bias error. Sometimes, 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.

Keywords
bias error, helical gears, twist, lead correction, lead crown correction, grinding, ground gears

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