The tire mold inner diameter measurement system based on AVR microcontroller designed in this paper uses grating ruler and laser rangefinder to measure the inner diameter of the mold. The microcontroller controls the stepper motor to change the measurement point by receiving the command of the host computer, and controls the grating ruler digital display to collect data and return it to the host computer in real time. The host computer calculates the grating ruler data and the laser rangefinder data to obtain the inner diameter of the mold, and the measurement accuracy is within 4 μm.
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