There is a problem with cnc precision machining, these steps can be used to find out the cause

Problems with cnc precision machining
1. The workpiece size is accurate and the surface finish is poor
Causes of failure: The tool tip is damaged and not sharp; the machine tool resonates and the placement is not stable; the machine tool has a crawling phenomenon; the processing technology is not good.

Solution: If the tool is worn or damaged, it is not sharp, then re-sharpen the tool or choose a better tool to re-calibrate the tool; if the machine tool resonates or the placement is not stable, adjust the level, lay the foundation, and fix it smoothly; the reason for the machine crawling is drag. The plate guide rails are severely worn, and the screw balls are worn or loose. The machine tool should be maintained and lubricated in time to reduce friction. Select the coolant suitable for workpiece processing. When it can meet the processing requirements of other processes, try to choose a higher one. Spindle speed.

2. The workpiece produces the phenomenon of taper size head
The cause of the failure: the level of the machine tool is not adjusted properly, one is high and the other is low, resulting in unstable placement; when turning the long axis, the contribution material is relatively hard, and the tool eats the knife deeply, resulting in the phenomenon of knife yielding; the tailstock thimble is not concentric with the spindle.

Solution: Use a spirit level to adjust the level of the machine tool, lay a solid foundation, and fix the machine tool to improve its toughness; choose a reasonable process and appropriate cutting feed to avoid the force on the tool; adjust the tailstock.

3. The phase light of the driver is normal, but the size of the processed workpiece is sometimes large or small.
Causes of failure: The long-term high-speed operation of the machine tool carriage leads to wear of the screw and the bearing; the repeated positioning accuracy of the tool holder deviates during long-term use; the carriage can accurately return to the starting point of processing every time, but the size of the processed workpiece still changes. This phenomenon is generally caused by the main shaft. The high-speed rotation of the main shaft causes serious bearing wear, resulting in changes in machining dimensions.

Solution: use the dial indicator against the bottom of the tool holder, and at the same time edit a fixed cycle program through the system, check the repeatability of the carriage, adjust the screw clearance, and replace the bearing; use the dial indicator to check the repeatability of the tool holder, Adjust the machine or replace the tool holder; use the dial indicator to check whether the workpiece is accurately returned to the starting point of the program, if possible, repair the spindle and replace the bearing.