Practical Effects
In most cases, roughness is considered to be detrimental to part performance. As a consequence, most manufacturing prints establish an upper limit on roughness, but not a lower limit. An exception is in cylinder bores where oil is retained in the surface profile and a minimum roughness is required.
Roughness is often closely related to the friction and wear properties of a surface. A surface with a large value, or a positive, will usually have high friction and wear quickly. The peaks in the roughness profile are not always the points of contact. The form and waviness must also be considered.
Read more about this topic: Surface Roughness
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