The main motion is the rotation of the tool during work, and the feed motion is the movement of the workpiece.

The main motion is the rotation of the tool during work, and the feed motion is the movement of the workpiece.

The main motion forms include rotation of the spindle, linear reciprocating motion of the rotary tool holder or worktable, etc.

For example, the rotational movement of the workpiece on the lathe; the rotational movement of the cutting tool on the drilling machine, boring machine, milling machine and cylindrical grinder.

The feed motion is continuous when the main motion is rotational motion, and intermittent when the motion is linear motion.

Feed motion is one of the basic motions of machine tools and has a direct impact on the processing quality and production efficiency of machine tools.

Extended information: Cutting motion is the composite motion of main motion and feed motion, represented by V, which is a vector.

The magnitude of the cutting motion is the vector sum of the main motion speed and the feed motion speed, and its direction is the resultant cutting motion direction of the selected point on the cutting edge relative to the workpiece.

The angle between the cutting motion direction and the main motion direction is called the motion relief angle, represented by axn.

The angle between the cutting movement direction and the feed movement direction is called the movement angle.

The motion relief angle reflects the degree of influence of feed speed on cutting speed.

The smaller the motion relief angle a is, the smaller the impact of feed speed on cutting speed is.

In most wood cutting processes, the main movement speed is much larger than the feed speed.

Therefore, in this case, the magnitude and direction of the main motion are often used instead of the magnitude and direction of the cutting motion.

In cutting processing, linear motion and rotary motion are the two most basic motion units.

No matter how complex the cutting method is, the cutting motion can be decomposed into these two basic motion units.