Events & Training

AGMA Webinar Series - Gear Design’s Stepchild - Root Fillet Configuration!

September 15, 2011 | 1:00 - 2:30 pm EDT

WEBINAR, Live Online

Speaker: Raymond Drago, PE, Chief Engineer, Drive Systems Technology, Inc.

Gear Design’s Stepchild – Root Fillet Configuration!
Raymond Drago, PE, Chief Engineer, Drive Systems Technology, Inc.
September 15, 2011
1:00 PM to 2:30 PM Eastern

Click here to register for this event.

This webinar will address the design details and pitfalls related with the gear tooth fillet configuration – NOT just the fillet radius specification. Often this parameter is not specified at all or only minimally noted on the engineering drawing. In fact, however, it is one of the most important factors in determining the actual bending strength of the gear tooth. In this regard we will discuss the various types of fillet forms including full trochoidal, corner radius trochoidal and full circular. Superimposed on these is the complicating detail of undercut which is developed either unintentionally due to tooth number and pressure angle conditions or intentionally to allow finishing the tooth flanks only (i.e. by flank grinding, lapping, honing, hard cutting, etc.) without creating a step in the critical section region.

The very powerful effect of the fillet configuration will be demonstrated by actual calculation using various fillet configurations for the same basic tooth configuration. We will see that the specifics of the fillet configuration can affect the tooth strength by 50% or more. In addition, we will also address the actual deleterious effects of a step at the root upon tooth bending fatigue strength. This effect is a function of the location, depth and radius at the corner of the step and can vary greatly. In order to implement this knowledge, we will close with a presentation of the proper drawing call out for complete fillet configuration control that will insure maximum and more importantly, consistent and repeatable tooth bending strength.

Who Should Attend?
This seminar will benefit both user’s and designers and will provide a better understanding of the importance of the fillet while providing the tools necessary to effectively control and define this critical parameter. Those involved in gear cutting will also find the insight gained from this session to be useful in making decisions regarding tooling where the customer’s specifications (drawings) are lacking adequate definition while also addressing possible liability associated with inattention to fillet condition.