Failure phenomenon —– When the screw to a turn, the workpiece has not been turned to the integer result.

main reason

Machine spindle encoder synchronization belt wear, spindle synchronization can not detect the true speed; programming the input host is not correct; X-axis or Y-axis screw wear.

Solution

Spindle encoder synchronization belt wear: As CNC lathe turning thread, spindle and tool movement by the host machine information processing center issued instructions to control, turning thread, the spindle speed constant, X or Y axis can The movement speed is adjusted according to the workpiece lead size and the spindle speed, so the spindle must detect the spindle synchronous true speed in order to issue the correct command to control the correct movement of the X or Y axis. If the system can not detect the true speed of the spindle, the actual turning will issue a different command to the X or Y, then the spindle to a turn, the tool moves the distance is not a lead, the second thread when turning Random deduction. In this case, we only repair the machine, replace the spindle timing belt.
The system programming is incorrect: when turning the thread in order to prevent the random deduction, we must ensure that after a knife turning trajectory with the previous knife turning trajectory coincidence, in the general car we use the inverted car method to prevent chaos deduction. In the CNC lathe, we use the program to prevent chaos deduction, that is, in the preparation of processing procedures, we use the program control screwdriver before turning the knife after the knife, so that the starting position after the knife with the beginning position of the previous knife coincidence (equivalent to General car turning thread, the thread knife back to the knife before the car out of the spiral groove), so that the car will not be out of the screw thread. Sometimes, due to the program input of the lead is not correct (the latter part of the program lead and a program lead is not consistent with the previous paragraph), turning the phenomenon of chaos deduction will appear.
X-axis or Y-axis serious wear and tear: the maintenance of machine tools, replacement of X-axis or Z-axis screw.