1. Method of inspecting the perpendicularity of two surfaces.
(1) Support the reference surface parallel to the platform with a magnet.
(2) Move the dial indicator from the curved root to the front end to obtain the maximum difference in readings as perpendicularity value.
Note: Measurement is taken along the entire length.
2. Method of inspecting the perpendicularity of a surface and a line.
(1) Support the object to be measured on the platform using a magnet as shown in the diagram.
(2) Touch the dial indicator to the object to be measured, zero it at point B and confirm it at point C.
(3) Move the dial indicator up and down throughout the indication range while touching it to the object being measured.
(4) Repeat measurement at 0° and 90°.
(5) Calculate the maximum difference between each reading using the following formula.
The resulting value is the perpendicularity value (maximum difference in reading at 0° → X; maximum difference in reading at 90° → Y):
3. Method of inspecting the perpendicularity of a line and a surface.
(1) Insert suitable fitting gauges into two reference holes and support them at right angles to the platform using a magnet.
(2) Measure all points on the measuring surface with a dial indicator (or height gauge) and take the maximum difference in readings as the perpendicularity value.
