After a laser cutting machine malfunctions, how do you locate the focal point?

After a laser cutting machine malfunctions, returning to the zero point (the machine coordinate system origin) is a critical step in restoring normal operation. Please be sure to follow the principle of safety first and operate with caution. The following are the detailed steps and handling methods for different scenarios:

Step 1: Safety Preparations and Preliminary Inspection

1. Safety First: Disconnect power/Enable. For most machines, first log in to the system, locate the “Enable” or “Servo Ready” button, and turn it off to ensure the machine does not move unexpectedly. If the fault is severe (such as a violent collision), you can directly disconnect the machine’s main power supply.

2. Clear the worktable: Remove cutting materials, scrap, and any obstructions to ensure that there are no obstacles in the travel paths of the worktable and crossbeam, thereby preventing secondary collisions during the homing process.

3. Inspect the hardware: Visually check the laser head, nozzles, sensors, and other components for any obvious physical damage. If there is a collision, be sure to check and repair the hardware problems (such as replacing the nozzle or sensor of the collision), otherwise it will not be able to return to zero accurately.

4. Clarify the cause of the abnormality: recall or check the alarm information. Common anomalies that cause zero loss are:

Sudden power failure during processing.
Impact machine (the cutting head collides with the plate, fixture or bed).
Improper operation when using the function of “Carving/Cutting with Breakpoint.
System or software failure.

The second step: according to different control systems and circumstances to choose the zero method

Important note: The following operations are based on common laser cutting control systems (such as Baichu, Jiaqiang, etc.). Please be sure to check your equipment

The specific user manual.

Case A: Standard mechanical return to zero (most commonly used and recommended)

This is the most thorough and accurate way to retrieve the zero point, which is suitable for most abnormal or reboot situations. The control system will drive each axis (X,Y,Z) to move in a preset direction until the mechanical origin switch is triggered, thereby determining the physical absolute zero.

1. Power on: Connect the main power supply and start the control system and machine tool.

2. Enter back to zero mode:

On the control software interface, look for buttons or menu options such as “Back to Origin”, “Back to Zero”, “Mechanical Back to Zero” or “Go Home”, “Home”, “Ref” in English.
Usually the icon for the back-to-zero button is a “hut” or “bullseye”.

3. Perform zero return:

Note: To ensure safety, it is recommended not to directly press “one key to return to zero”, but to return to zero separately on separate axes. Usually, the sequence is that the Z axis (cutting head) is lifted up first → the X axis returns to zero → the Y axis returns to zero → the Z axis returns to zero finally.
Z axis up: first manually operate the Z axis to rise to a safe height to prevent scratching the table when returning to zero.
Return to zero in turn: on the manual control panel or software, select the X axis and click “Return to zero”. Observe the X-axis movement and stop automatically when it reaches the origin position. The Y-axis is also operated.
Z-axis return to zero: finally perform Z-axis return to zero, and the cutting head will drop to the position of the detection origin switch.

4. Confirmation completion: After the zero return of each axis is completed, the coordinates of each axis on the control software shall be displayed as (0,0,0) or a small fixed mechanical coordinate value (such as X0.000,Y0.000). There may also be a “zero complete” prompt on the screen.

Case B: Handling with floating zero/power down memory

In some high-end systems or specific settings, the machine uses a “floating zero point” to remember the current position after power failure.

1. Observation after restarting: Do not move the machine after starting up, and directly check the software coordinates. If the coordinates are not zero, but you know the coordinates of the last safe position before the exception (or the drawing origin position).

2. Manually set to zero:

Manually move the cutting head (using the arrow keys or handwheel) to a known, secure physical location (e. g., locate the center of the hole or a corner of the sheet).
In the software, sets the current point as the workpiece origin (typically Set Workpiece Coordinates or WCS).
But this does not restore the machine coordinate system. To restore the machine coordinate system, it is still necessary to perform a mechanical zeroing of case A or “coordinate system reset” according to the manual “.

Case C: Inaccurate alignment caused by collision or continuous cutting at breakpoint

At this time, the mechanical zero point may not be lost, but the workpiece coordinate system is offset.

1. Mechanical zero return first: first implement the standard mechanical zero return of case A to ensure that the machine tool coordinate system is correct.

2. Reposition the workpiece:

Reposition the plate or workpiece on the work surface.
Use the “positioning” function of the control system (corner positioning, center positioning, etc.) or manually move the laser head to the physical corner point of the plate.
In the software, set this point as the new work origin (G54, etc.).
Re-import or call the machining program to ensure that the graphics origin in the program is consistent with the workpiece origin just set.

Step 3: Verification and Testing

After the zero point is recovered, be sure to carry out an empty walk test, and do not cut the material directly!

1. dry run test:

Load a simple shape (such as a small square or circle).
In the software, click the “dry run”, “simulation” or “go border” function.
Observe whether the trajectory of the laser head movement is exactly the same as expected, especially whether the start and end positions are accurate. Check whether it will touch the fixture or the outer edge of the plate.

2. Tried cutting verification:

The actual cutting test is carried out on the scrap plate to verify that the dimensional accuracy and contour are correct.

Frequently Asked Questions and Precautions

Zero return failure alarm: if the machine moves but cannot find the origin switch during the zero return process, the alarm may be:

The origin switch is damaged or loose.
Poor contact of switch signal line.
Motor or drive failure. Need to contact professional maintenance personnel.

Can’t find the back-to-zero button: Check the software interface carefully, or press the “Home” key on the keyboard to try.

Different system differences: Berchu (FSCUT), Ruike (RDCAM), New Generation, Farley and other system interfaces are different, but the core logic is the same: first find the mechanical origin, then set the workpiece origin.

Develop good habits:

After each boot first back to zero.
Clean and maintain the origin sensor regularly.
Back up the machine parameters (especially the mechanical coordinate parameters set by the manufacturer) to prevent the system from crashing.

Summary Flow Chart

In case of abnormality → power off/shutdown → clean the table and check the hardware → analyze the cause

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Power on and power on → enter manual/return to zero mode

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[Preferred] Perform “mechanical return to zero” on separate axes (Z axis is lifted first → X → Y → Z)

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After the zero return is completed, the coordinates are displayed as zero or mechanical coordinates

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Reposition the workpiece, set the “workpiece origin”

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dry run test verification path → success → normal cut

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Failure/Alarm → Check origin sensor/contact after-sales service

If the above steps cannot be solved, or the operation is not sure, the safest way is to stop the operation immediately, practice equipment manufacturers or professional maintenance service providers, to avoid greater losses caused by misoperation.