This is the mechanical "Jig" used for Fiducial / origin calibration.
fiducial origin maintained regardless of height adjustment.
Thus accurate GRID calibration ( in this case 6.35mm ) to BASE_DATA[1] origin.
NOTE:
BASE_DATA[1] = fiducial plate placed into the aluminium plate without the blue scissor adjuster. So the Cognex ORIGIN and the robot BASE origin are identical.