Explanation of Tool Compensation in CNC Machining Centers-Tool Length Compensation

The data input for CNC machining center programming requires specifying the machining center of the part in order to establish the workpiece programming coordinate system. This coordinate system is only a workpiece coordinate system, with the zero point on the workpiece.

 The length compensation of CNC machining center is only related to the Z coordinate, unlike the programming zero point in the X and Y planes; The tool is positioned by the spindle taper hole without changing, and the length of each tool at the zero point of the Z coordinate is different.

The CNC machining center needs to drill a hole with a depth of 50mm, and then tap a hole with a depth of 45mm. Using a 250mm long drill bit and a 350mm long tap, the drill bit is used to drill a hole with a depth of 50mm.

 At this point, the machining center has already set the zero point of the workpiece. When replacing the tap for tapping, if both tools start processing from the set zero point, the tap will be too long to tap due to being longer than the drill bit, causing damage to the tool and workpiece.

 If tool compensation is set, Compensate the length of the tap and drill bit. After setting the zero point of the machining center, even if the length of the tap and drill bit is different, due to the existence of compensation, the zero point Z coordinate has automatically compensated the length of the tap to Z+(or Z) when calling the tap to work, ensuring the accuracy of the machining zero point.