The invention belongs to the field of the mechanical
processing, in particular to a follow measurement method for roundness of a
crankshaft pin, which is characterized in that a measuring head is arranged on a
grinding carriage guide rail, and the
vertical plane of the measuring head leans tightly against the external surface of the
crankshaft pin to be measured; a
crankshaft pin specimen is selected, and an on-line measurement
roundness error at various angles of the connecting rod journal specimen is measured on line; the actual
roundness error is deducted from the measured
roundness error of the specimen so as to obtain fixed roundness error of the measuring
system; the data about the fixed roundness error are input into the measuring
system, the workpieces are arranged, and the actual roundness error of the connecting rod journal workpiece can be obtained by automatically subtracting the fixed roundness error of the workpiece from the measuring roundness error of the workpiece, and the
numeral system carries out another
machining to eliminate the workpiece roundness error, according to the correction program data of the actual roundness error of the workpiece. The follow measurement method of the invention adopts single-point measurement, thus having the advantages of simple structure, convenient measurement, being scientific and rational and having good economy.