Assertion: spiral groove bearing | /r/HasProperty | self-acting
Facets:
Source sentences:
text: Spiral groove bearings (also known as Rifle bearings) are self-acting (journal and thrust), or hydrodynamic bearings used to reduce friction and wear without the use of pressurized lubricants.
text: Spiral groove bearings are self-acting because their own rotation builds up the pressure needed to separate the bearing surfaces.