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...ions and draw a diagram on the screen 11) For the identification, the microcontroller will measure the error degree in this way: Firstly, the load is forced make some certain movement in the middle position in the actuator. The microcontroller will judge the friction influence by comparing the real position with the ideal position. Secondly, the load will make a rapid movement to the beginning and end position. The microcontroller will estimate the compressibility by analyzing the small displacement at the beginning and end position The program is as follows: N000 G02 X90 FX80 ． The load moves from the initial position to 90 mm with ． the speed of 80% of the maximal velocity N005 G04 50 ．The load stops for 50 ms N010 G02 X445 FX10 ． The load goes back to 445mm with the 10% of the ．maximal speed N015 G04 50 ．The load stops for 50 ms N020 M30 ．Procedure is over From the movement diagram we can find out that 1) The movement path is not smooth 2) There is a small trough in the intersection area of the first rapid movement and first pause( the load at the position about 450mm) Reason for 1) is mainly concentrated in the friction between the load and the actuator surface. The friction will decrease the velocity of the load so that the load will not move to a certain position with a designed velocity. In another word the load can not move to the certain position at a certain time. Reason for 2) is mainly concentrated in the compressibility. We can observe that the load moves back to the position 450mm rapidly, Because of the very high speed the load can not stop immediately but moves further for a little displacement and goes back to the destination (450mm). As is known to all, the load has a relative high inertia when it moves fast. To set off against this inertia it needs enough counteractive force or the rigid barrier. But the air is compressible; it can not afford an enough counteractive force to the load instantaneously, so it will be compressed for a small displaceme...