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The movement speed of the CNC cutting machine does not actually affect the system error. It only makes the measured error performance larger or smaller. In general, the larger the speed, the smaller the measured error value, and vice versa. (It can be seen from the following test results). The main factors influencing the measurement result are: the parallelism between the scale and the table, the determination of the origin of the machine, the speed of movement during measurement, and the rounding error in data processing.
The parallelism between the grating ruler and the numerical control table is the main reason that causes the measurement error value to be larger, and should be carefully adjusted before the measurement. During the adjustment, the watch stand is fixed on the work table, and the elastic contact of the dial indicator rests on the outer surface (reference plane) of the scale.
When the table is moving, the CNC cutter adjusts both ends of the scale according to the swing of the pointer until the pointer swings between ±5 μm, and the two can be considered to be parallel. The ability to accurately determine the origin of the machine is an important factor in the measurement results because the mechanical origin of the system is the benchmark for the entire measurement process.
The CNC cutting machine system uses the inductive limit switch as a coarse positioning. Once the movement axis is offside, the movement of the axis stops immediately, so that the table no longer moves toward the offside area. The precise positioning of the mechanical origin takes the form of finding the index position, ie combining the Index signal and the limit switch signal, capturing the current position of the axis.
The computer first obtains the limit switch signal, and then issues the command to capture the Index signal and controls the forward or reverse rotation of the motor. The GM400 encounters the first Index signal of the encoder as the trigger signal captured by the position, and captures the current position. Can be used as the mechanical origin of the system. The position of the origin captured by the GM400 is the actual position of the movement axis at the arrival of the trigger pulse. The accuracy of the captured position can reach ±1 pulse, which is reflected on the digital display and allows the positioning error of the CNC cutting machine to be controlled within 5 μm.
In addition, since both the error value and the compensation value are extremely small, rounding errors should be minimized during data processing.
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