Quality of surface is an important factor to decide the performance of a manufactured
product. Surface quality affect product performance like assembly fit, aesthetic appeal
that a potential customer might have for the product. A surface is defined as the exterior
boundary of an object with its surroundings, which may be any other object, a fluid or
space or combination of these. The surface encloses the object’s bulk mechanical and
physical properties.
A surface is what we touch, when we held a manufactured object. Normally dimensions
of the object are specified in its drawing relating the various surfaces to each other.
These nominal surfaces, representing the intended surface contour of the manufactured
part, are defined by line in the drawing (machine). The nominal surfaces of the object are
represented by perfect straight lines, perfect circles, round holes, absolute
perpendicularity and straightness. A variety of processes are used to make the designed
parts. In totality the manufacturing result is wide variations in surface characteristics. It
is important to know the technology of surface generation. Only then the root causes of
deviations can be determined and fixed to get the good results