Surfaces are very important due to various commercial and technological reasons. These
reasons may be different depending on different applications of the product. The main
objectives are described below.
(a) All smooth surfaces which are free from scratches and blemishes provide
good aesthetic appearance. This all add value to product and give a
favourable impression to the customers.
(b) Smooth surfaces free from scratches and sharp corners and edges give
safety to users.
(c) Friction and wear also decided by surface conditions. In case of mating
parts, the mating surfaces should be perfectly finished to avoid wear and
energy loss due to friction.
(d) Good quality surfaces improve mechanical and physical properties. Any
surface flow can act as a point of stress concentration.
(e) A slightly rough surface having uniform and constantly maintained value of
surface roughness provides anti-glazed property to the same.
(f) Smooth surfaces improve capability to make good electrical contacts.