If the plate is properly supported, precise leveling is only necessary if your application calls for it. Leveling is not necessary to maintain the accuracy of a properly supported plate.Oct 31, 2019
How do you lap a granite surface plate?
https://www.youtube.com/watch?v=-CM3VWKXasY
What is plate calibration?
Surface Plate Calibration is the only sure way to know that you are working with a level surface and can expect accurate workmanship when the surface plate is in use. Surface plates wear over time and must be properly maintained to ensure flatness and continued precision measurement.