2. Cast iron flat plane wave momentumThe plane wave gauge on the tablet, along arbitrary direction of a linear motion plane wave instrument. Mobile distance for tablet half the length of the diagonal and should not be less than 200 mm. Take plane wave meter indicator (dividing value of 0.001 mm) on the most in the difference of the values and minimum values. Is the checked plate plane wave of momentum in the working face.3. Cast iron plate deflectionPut detection device have been flat, without loading charge, the torsional spring comparator probe in contact with the working face (measured in order to make accurate, between the head and face can put a piece of thin gauge block) and write down the readings. Then according to the rated load given in table 5 force f and write down the readings;The difference between the two readings is the checked plate working face under the rated load deflection value.