1. There are many reasons for workpiece overcutting in CNC processing. If the workpiece is overcutted, it will be processed after repair welding, or it will be directly invalidated. In particular, it is the most troublesome thing to encounter workpiece overcutting during large mold processing. How to deal with it? Let's share it with you below

If the workpiece overcut is programmed manually, it is caused by forgetting to take the tool radius into account in the programming. If it is software programming, it may be the selected tool alignment rather than tangency. Both programming methods will lead to workpiece overcut.

2. There is also the fault of tool selection for over cutting of machined parts. For example, a milling cutter with a diameter of 16mm is used in the program, but it is used as a milling cutter with a diameter of 20mm. Although the difference of 4mm is small to the naked eye, all the machined parts will become smaller. This requires carefully checking whether the tool diameter is reasonable before machining, and don't take chances.

3. Another reason for overcutting of machined parts is that the workpiece coordinate system input is wrong when zeroing. Remember to offset the radius value of a zero bar. The input error of tool compensation, tool length and tool radius compensation must be input correctly. If the input length of tool length is 0.5mm, the workpiece will be 0.5mm more, and the large workpiece will not be used directly, Whether the tool radius compensation is positive or negative should also be considered before machining. Otherwise, cutting directly will also lead to over cutting of the workpiece.

The above are the reasons for overcutting of several common machining parts. Others, such as loose spindle and low precision of ball screw, will cause overcutting in the machining process. After overcutting, check the reasons in time to prevent similar situations from happening again.