2.1 first record the initial position of the machine cross arm, select the speed value on the control panel (using the standard straight steel ruler to measure the cross arm stroke).
2.2 starter at the same time electronic stopwatch start time of one minute, stopwatch arrival time at the same time press the machine stop button, according to the stopwatch time, record cross arm travel value is the rate per minute (mm/min), observe the cross arm travel value and the difference between the straight ruler,and calculate the cross arm travel error.
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