Assertion: gear's teeth | /r/HasSubevent | rough running
Facets:
value: very
type: DEGREE
Source sentences:
text: The assembly conditions of compound planetary gears are more restrictive than simple planetary gears, and they must be assembled in the correct initial orientation relative to each other, or their teeth will not simultaneously engage the sun and ring gear at opposite ends of the planet, leading to very rough running and short life.