The formula for calculating time for facing contains a value вЂњFeed/Rev.,вЂќ which is confusing because it can be interpreted as feed divided by revolution.The following are the authorвЂ™s comments regarding this calculator: The lathe operations calculator page for cutting time for facing from of Calculator Edge A representation of this calculator and an example of calculating time for facing at selected cutting parameters is shown in Figure 1.ДЇigure 1. It calculates time for facing as a function of the constant rpm, workpiece diameter and feed per revolution. Among the numerous categories, the lathe operations calculator provides a variety of calculations, including cutting time for facing. One way to calculate cutting time for facing is to use Web sites such as which offers online calculators for engineers at no charge. Therefore, end users have a dilemma: facing at a constant speed or a constant rpm. A low cutting speed can cause built-up edge. It approaches zero at the center of a workpiece.

The closer a cutting tool is to the center of a workpiece, the lower the cutting speed. Facing at a constant rpm decreases the cutting speed, because the diameter of the facing surface gradually decreases by the amount of a feed per revolution. This operation can be performed at a constant surface speed (sfm, m/min.), which is recommended, or at a constant rotational speed (rpm), which is not recommended. It involves moving the cutting tool perpendicular to the workpieceвЂ™s axis of rotation. Image courtesy of KennametalДЇacing is a turning operation in which the workpiece is machined to its center. a constant rpm.ДЇacing being performed on a tubular workpiece. Comparison between calculating cutting time when facing at a constant cutting speed vs.

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