Selecting Feed for Carbide Turning Inserts
In rough turning operations power and stability of the machine and the chip forming ability are often limiting factors, the most economical data of cutting data,i.e.,maximum metal removal rate, is obtained with a combination of high feed and moderate cutting speed with limiting factors taken into consideration. The power available in the machine can sometimes be too low. In such cases, it is necessary to reduce the cutting speed to suit.
When selecting feed for finishing operations, surface finish, tolerance, and chip breaking requirements should be taken into consideration.Surface finish is determined by the combination of feed rate and insert nose radius,as well as the workpiece stablility,champing and the overall condition of the machine.Chipbreaking is determined by the selection of insert geometry.The wiper geometry inserts should be an obvious candidate for finishing operations which will affect the choice of feeds.
