Original Date: 10/14/1988
Revision Date: 01/18/2007
Information : Gear and Case Inspection
Bell Helicopter Textron, Inc. (BHTI) designs utilize two basic gear types - parallel axes (spur and helical) and non parallel-axes (spiral bevel). These gears are manufactured to extremely tight tolerances and are inspected for stock removal, tooth profile, tooth spacing, root radius blend, surface finish, and hardness. Inspection techniques include nital etch, magnetic particle, ultrasonic evaluation, fluorescent penetrant, coordinate measurement machine (CMM), and gear run-in and tooth space measuring machines. Gearbox housings are inspected to verify proper positioning of gears and to ensure exact mounting surface dimensions and distances. A Zeiss UMM 800 CMM is used for gearbox case inspection.
For more information see the
Point of Contact for this survey.