Flatness Measuring Tool

thingiverse

This tool with a dial indicator will allow you to measure how flat a surface is and if it is up or down. This design has a 250 mm span (About 10".) Calibrate it on a know flat surface. Granite counter top is ideal. I used it to flatten the bed of my printer CR10. The bore for the dial indicator is .375" this is common to the analog and digital dial indicator that I have. There is a provision for an M3 screw and nut to secure the dial indicator (it may be tight enough without the screw.) Place this part with the dial indicator in place on a flat surface. A granite counter top or thick glass (if it is a sheet of flat material check front and back to ensure the same measure or take the average.) Set the dial indicator to read zero. Place the set on the surface to measure and see if it has a plus or minus measurement. Carefully an methodically been the surface until is it flat. If there is a wave or cup, work around the part. Check measurements at all four sides of a plate, across the center and diagonals to ensure that it is flat.