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Robot two-axis gantry measurements


Both two moving axes in the gantry need to be measured separately using the calibrated TCP.



Measurement checklist:







Setting up the gantry measurements

To calibrate the gantry axes, all directions need to be measured to their own subprograms. Keep the same robot settings with zero base, zero tool and short spike, and attach the magnet spike somewhere so that the robot can reach the spike easily.

Info - Positioning the magnet spike
Position the magnet spike so, that the robot reaches it and it allows all the track axes to move as much as possible during the measurements. This results in a higher calibration accuracy.

Create a subroutine in the robot controller for the axis that is the closest to the robot in the kinematic chain. This is the one that moves the robot base. Then save one point so that the robot is on the one end of the gantry axis and second when the robot is on the other end of the same axis. Make sure that in the second point the spike tips match exactly, move only the robot joints to match the points.

After saving the two points, create a new program for the remaining axis and save the points similarly.

Note - Keep other axes stationary
Make sure that the other external axes are stationary while taking the measurements! Otherwise the calibration will fail!

After gantry calibration, you should have 2 programs with 2 points each.

After taking the measurements

Save all the subprograms to a USB-stick from the controller.