Could be the bearings.
Usually tapered roller bearings.
not sure ...
Bearings are used to let the wheels spin freely and with minimal drag.
Turbochargers turn too fast for ball bearings. Sleeve bearings are typically used in this application.
An osteotome is used to cut or prepare bone.
Did you look at the alternator bearings?Take the belt off and spin the alteranator to see if the bearings are bad.
Commodity bearings are used in rotating elements that have relatively low revolutions per minute and do not face extreme stresses.
Pivot bearings are frictionless bearings and suitable for pivotal, angular, or oscillating applications. Collar bearings are often used install equipment with a simple set screw.
The Roller bearings can be used at all the places where the severe loading is applied at high velocity between two moving parts
of Scrape, The act of scraping; the act or process of making even, or reducing to the proper form, by means of a scraper., Something scraped off; that which is separated from a substance, or is collected by scraping; as, the scraping of the street., Resembling the act of, or the effect produced by, one who, or that which, scrapes; as, a scraping noise; a scraping miser.
that's simple an plate scrapper is used for scraping any last peaces of food that are to hard to get of.