Feeding the drill into the workpiece axially. Producing surfaces perpendicular to the workpiece axis is called facing. A chuck has movable jaws that can grip the workpiece securely. Either the workpiece or the tool holder is rotated. There is also the contact resistance between the welding electrodes and the workpiece. Internal grinding is used to grind the internal diameter of the workpiece. Upset forging increases the diameter of the workpiece by compressing its length. The alternating magnetic field induces eddy currents in the workpiece. To provide good forming conditions a homogeneous temperature distribution in the entire workpiece is necessary. The operation is performed for producing indentations on a part of a workpiece. Electroplating changes the chemical, physical, and mechanical properties of the workpiece. Spindles are powered and impart motion to the workpiece. It is used to measure compound angles of large workpiece. The broach can be moved relative to the workpiece or vice versa. The clearance is also dependent on the hardness of the workpiece.