What to do if the reference point of the CNC machine tool is lost

The origin of CNC lathe is the basis of CNC machining, and once lost, it will affect the machining accuracy and quality. So, when the origin of the CNC lathe is lost, how should it be reset?

The reason for the loss of the origin.

First, understand what caused the origin to be lost so that you can better avoid this problem from happening again. There are several main reasons for the loss of origin:

Machine parts are damaged.

Human error.

System failure. Control program errors.

To reset the origin.

Here are the steps to reset the origin of a CNC lathe:

Determines the coordinates of the origin.

Through manual operation or other means, determine the origin of the installation of the ear mark.

Turn on the machine system.

According to the instructions of the machine manufacturer, turn on the machine system.

Enter the CNC program.

Enter the numerical control program to enter the CNC exercise and divination interface.

Set it up in the NC program.

Set it up in the NC program, including setting the coordinate system and origin coordinates.

Complete the setup. After the resetting is completed, the processing test is carried out to ensure that the processing effect meets the requirements.

Precautions When resetting the origin of the CNC lathe, you need to pay attention to the following points:

Make sure the machine is stopped.

Abide by the operating procedures of the machine tool and operate in strict accordance with the instructions of the machine tool manufacturer.

Avoid operation errors, resulting in secondary failure of the machine tool.

Carry out processing tests to ensure that the processing effect meets the requirements.

Conclusion The loss of the origin of the CNC lathe is a major event, which needs to be dealt with and reset in time. Through the above steps and precautions, you can help you reset the origin and ensure the processing effect and accuracy.

1.When manually returning to the origin, the axis of the return to the origin first moves to the direction of the origin at the fast moving speed set by the parameter; When the deceleration stop depresses the origin deceleration switch, the return to the origin axis decelerates to the slower reference point positioning speed set by the system parameters and continues to move forward; When the deceleration switch is released, the CNC system begins to detect the grid point or zero pulse of the encoder; When the system detects the first grid point or zero pulse, the motor immediately stops rotating, and the current position is the zero point of the machine tool.

2.The back-to-origin axis first moves to the origin direction at the fast-moving speed set by the parameter; When the deceleration block depresses the origin deceleration switch, the return to zero axis decelerates to the reference point positioning speed where the system parameters set slower, and the axial moves in the opposite direction; When the deceleration switch is released, the CNC system begins to detect the grid point or zero pulse of the encoder; When the system detects the first grid point or zero pulse, the motor immediately stops rotating, and the current position is the zero point of the machine tool.

3.The back-to-origin axis first moves to the origin direction at the fast-moving speed set by the parameter; When the deceleration block depresses the origin deceleration switch, the return to zero axis decelerates to the reference point positioning speed where the system parameters set slower, and the axial moves in the opposite direction; When the deceleration switch is released, the zero shaft is reversed again; When the deceleration switch is pressed down again, the zero axis is returned to run at the speed of finding zero pulse, and the numerical control system begins to detect the grid point or zero pulse of the encoder; When the system detects the first grid point or zero pulse, the motor immediately stops rotating, and the current position is the zero point of the machine tool.

4.After the return to origin axis is connected to the zero return signal, it moves to a fixed direction at a slower speed at the current position, and the numerical control system begins to detect the grid point or zero pulse of the encoder; When the system detects the first grid point or zero pulse, the motor immediately stops rotating, and the current position is the zero point of the machine tool.

When the CNC machine tool returns to the reference point and fails, first check whether the deceleration block is loose and whether the deceleration switch is fixed firmly or damaged. Check the length of the speed brake block and whether the installation position is reasonable; Check the pulse encoder or grating ruler, etc.

CNC car does not need to go back to the reference point, just go back before starting the machine, the machining center must be back, otherwise the manipulator can not change the tool, there is no impact on the accuracy, the CNC car changes back to the reference point every time, in fact, it is to eliminate the vector gap, the new machine does not need to go back to waste time.

The CNC machine tool tool change back to the reference point is generally to eliminate the accumulated error, to prevent the second tool in the tool when the Z-axis error is too large, the machining center tool change only back to the Z-axis. Generally, it is best to return to zero for the three axes of finishing (anyway, the speed of the machine tool is very fast now, and it will not take long to delay), and rough machining does not matter. The machine tool generally has to be tested after the detection point, otherwise it is meaningless to set that detection point.

The position of the origin of the bed machine tool is set by the factory when the machine tool leaves the factory.

Each time a reference point is passed, it is not necessary to check the restart and return to the reference point to determine the accuracy of the machine.

Question 1: When changing the tool, it is precisely said to be the return to the tool change point, there is no need to return to the origin of the machine tool, of course, some machine tool change points are done at the second origin point, so you feel that you are back to the original point. It's just that the Z-axis back parameter or all the axes will not have anything to do with the accuracy, if you rely on this to eliminate the gap, then the equipment will not work at all.

Question 2: I think the machine tool detection point you talked about is the 0 pulse point of the motor, when the machine tool receives the signal of hitting the 0 block back to zero, the motor rotates at a certain speed, looking for this 0 pulse point, some people also call it Z phase pulse. The distance of the reference point from this 0-bit pulse can then be controlled via the parameter.

Back to your topic: there is a detection point for every revolution of the motor or every pitch of the machine. Of course, this signal will be fed back to the system, but if it is not in the return to 0 mode and when the signal such as the return 0 block is received, the system will not process it, which is equivalent to not detecting it at this time (with a full closed-loop device such as a grating ruler is discussed separately).