Bearings

Question 1

purpose of a bearing

Answer 1

restrict motion in one or more directions while permitting free motion in another
(support forces in one or more directions and offer no resistance in others)

Question 2

type of bearing which permits motion by sliding surfaces

Answer 2

plain bearings

Question 3

why are bushings limited to lower speeds

Answer 3

sliding friction

Question 4

should bushings be softer or harder than the shaft?

Answer 4

softer

Question 5

should bushings have clearance or interference fits between sliding surfaces?

Answer 5

clearance

Question 6

a type of bearing suited to large shafts at high speeds which requires lubricant supply

Answer 6

hydrodynamic bearings

Question 7

what is the function of libricant in bearings?

Answer 7

reduce friction
remove heat if flowing

Question 8

what is the function of sealing in the context of bearings?

Answer 8

keeps lubricant in and dirt out

Question 9

two ways to constrain rotation when using a linear plain bearing

Answer 9

shape of rail or use two rails