Surface Finish Requirement:

In finish machining, the power requirement is not likely to be a constraint. This however, should be considered in case of rough machining. Hence, the following condition should be satisfied

P = W V f ^α d ^β ≤ P_max

where, P_max is the maximum power available on the machine tool.

Surface finish constraint must be taken into consideration during finish machining. For a round nosed tool turning, surface finish is expressed in terms of feed rate ( f ) and nose radius (R); peak to valley height (h′) in this case is expressed by :

h′ = f² /8R

And in case of CLA (center line average) value, the surface finish is expressed by :

Therefore, the constraint on the feed for the specified surface finish (hmax) can be expressed as :

                                     Cf ² ≤ hmax

where, C = 1/8R   (for peak to valley height)

                                    (for CLA)

These values of 'V ' and 'f ' should be checked for remaining restrictions whether they are violated or not.