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Difference between ball and roller?

Question asked by nibhani in #Coffee Room on Jun 22, 2012
nibhani · Jun 22, 2012
Rank C3 - EXPERT
What exactly is the difference between ball and roller? I've been studying this topic in my mechanical engineering textbook. Would appreciate your responses. Posted in: #Coffee Room
mechky · Jun 23, 2012
Rank C2 - EXPERT
Is it about bearings?
Siddhant Mukherjee
Siddhant Mukherjee · Jun 23, 2012
Rank D1 - MASTER
this is quite simple a ball is a sphere while a roller is a cylinder. both can roll: a ball makes point contact while a roller maks line contact ideally. Speaking of bearings, you can easily visualize and differentiate a ball bearing with a roller bearing by seeing the rolling object in it. generally roller bearings are used in heavy loading conditions to reduce the stresses developed in the bearing.
The myth buster
The myth buster · Jun 25, 2012
Rank D2 - MASTER
type of contact explains the difference..ball has a point contact whereas roller has a line contact..A ball is a sphere whereas a roller is usually a cylinder or a frustum(a tapered roller)..!!
zaveri · Jun 26, 2012
Rank A3 - PRO
maybe this question is about the types of bearings.

it has already been discussed about the type of contacts, balls and rollers , make with flat surfaces.

another point is that balls can easily change their direction of rolling. but a roller on the other hand which is cylindrical (and makes line contact) cannot do so that easily.

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