Welding Robot Welding torch TCP Accuracy Calibration and Tool Coordinate System Setting Tutorial

Outside the robot workbench, fabricate or prepare a highly rigid, sharp needle-like metal object as an external reference tip tool. Its tip position must remain absolutely stable throughout the entire calibration process without any visible displacement.

Securely and vertically lock the fabricated reference tip tool onto the workbench. Simultaneously, remove the protective nozzle at the front of the welding torch, and install the device’s dedicated calibration tip needle (or a rigidly straightened new welding wire) onto the contact tip holder of the welding torch as the moving calibration end.

Enter the teach pendant system and switch the protection level to the internal maintenance state. In the program management menu, create a dedicated temporary program for recording the tool coordinate system parameters. Designate the program number as [9998], and add an explanatory remark such as “TOOL-1”.

Set the teach pendant’s motion interpolation method to [LIN] (Linear Interpolation). Manually manipulate the robotic arm to pose 10 different welding torch postures with the largest possible spatial amplitude, even approaching each joint’s limit. Core point: For each posture, you must ensure that the apex of the welding torch’s tip needle and the apex of the workbench’s reference tip tool achieve absolute “tip-to-tip” coincidence. Record a position point for each aligned posture, totaling 10 spatial position points, and add an END command at the end.

Ensure that the posture angle differences of the 10 spatial coordinate points recorded in program 9998 are large enough. Then, while pressing the rear safety enable switch (Deadman switch), press the front function key [Constant Setting]. In the pop-up system menu, select [Mechanical Constant], and further click to enter the [Tool Setting] branch.

After successfully entering the underlying tool setting parameter window, below the detailed control bar for the corresponding tool number (e.g., Tool 1), click the [Simple Setting] soft key on the screen to activate the multi-point algorithm fitting calculation program.

In the pop-up simple setting sub-menu, while holding the “Deadman” key, use the up and down arrow keys to move the cursor and select the [Axis Constant and Tool Length] parameter calculation option specifically designed for the standard ten-point method.

Input the newly created calibration program number [9998] into the data source program guide box. After verifying its accuracy, click the [Execute] button at the bottom right of the screen. The system will automatically read these 10 spatial position postures and begin matrix calculation.

After the system matrix calculation is complete, a result value display box will pop up. Key point: You must strictly check the maximum error value. Standard requirements dictate that the maximum error should be less than 2mm (usually, high-precision arc welding stations require controlling it to around 0.5mm for optimal results). If the displayed result is less than 2mm, click [Possible]. If the error is greater than 2mm, it indicates that there is visual deviation in the tip-to-tip alignment of some points. You must exit the tool setting, correct the position points with large deviations in program 9998, and re-execute steps 5 to 9.

Once the calculation result is approved, the system will present the final tool translation constants (X, Y, Z, and rotation angles around each axis). At this point, click the [Write] button at the bottom of the screen to forcibly save the tool constants. With this, the complete set of TCP precision calibration is officially successfully concluded.