There are two major types of axis operations: independent axis control and interpolation control.

In independent axis control, the axes operate individually without any relation to each other.

An interpolation control is a control in which multiple axes move by interpolating. The movable portions move by drawing a desired profile (contour) to reach the target position. Normally, the speed is controlled so that the vector speed (speed in the traveling direction) is constant.

**Independent axis operation****Continuous feed**

Continuous feed is an operation where no stop position, but only the speed is specified.The operation continues until a stop command is issued.

**Positioning** Positioning is an operation that places the carriage at a target point.The target point and speed are specified.

**Homing**Homing is an operation that returns the carriage to the reference point of the operation (origin). Homing is performed to match the position on the machine with that on the software.

**OLS (origin sensor) homing**The position where the OLS turns ON becomes the origin.

**OLS + phase-Z homing**The position where the carriage stops on the specified phase-Z count from the point where the OLS turns ON becomes the origin.

**ELS (end-limit sensor) homing**The position where the ELS turns ON and inverts to OFF becomes the origin.

**Timer operation (dwell)** Timer operation is an operation that stops the carriage (does not perform next operation) for an indicated length of time.

**Interpolation operation****Linear interpolation**

Linear interpolation is an operation that linearly moves the carriage from the starting point to the end point.

**Circular interpolation** Circular interpolation is an operation that moves the carriage circularly through the specified end point and center point, and in the rotation direction.

**Representative axis for interpolation**

A “representative axis” refers to the X axis or an axis the closest to it when circularly or linearly interpolating a set of axes from the X to U range.With an 8-axis board, the representative axis will be the V axis or an axis the closest to it when circularly or linearly interpolating axes from the V to B range.Similarly, with an 12-axis board, the representative axis will be the X1 axis or an axis the closest to it when circularly or linearly interpolating axes from the X1 to U1 range; X2 axis or an axis the closest to it with axes from the X2 to U2 range, and X3 axis or an axis the closest to it with axes from the X3 to U3 range.This representative axis is used to set the “interpolation speed” and read the speed at which the interpolation is being performed.

**Major axis (main axis) and minor axis** A “major axis” (or main axis) refers to an axis that has the maximum traveling distance in a set of interpolating axes. The rest of the axes are called “minor axis”.