Instrument for automation of large diameter testing

Summary

• 1. Instruments based on the decimal system of readings have certain advantages as compared with other instruments: their design is simpler, they have a longer life, are economical and provide a simple transition to 0.01 mm readings.

• 2. An instrument based on a decimal system of reading provides the most efficient and effective measurement of dimensions owing to the possibility of switching the reading from 0.1 to 0.01 mm by measuring over one or ten revolutions of the detail.

• 3. Utilization of a disc with a diameter of 100 mm provides an easy correction for its inaccuracies. At the same time the pressing force on the disc which in the case of a photoelectric transducer amounts to 8–10 kg-wt (78–98 N) produces an insignificant reduction in the diameter due to the wear of the disc.

• 4. The measurement error of an instrument based on the decimal system of counting ensures the measurement of diameters in details of the 3rd class of accuracy, and in certain cases of the 2nd class of accuracy.

• 5. Active coordination and speeding up of work is required in producing automatic and operative control instruments and standard attachments to them for the newly developed machines, as well as for equipping the existing stock of machines.