When measuring the control error of CNC systems, the errors brought by machine tools will affect the veracity of CNC
test. A new test approach based on simulation model of machine tool is proposed in order to well solve the problem. The
structure and principle of the test approach is demonstrated. The simulation model of virtual machine tool and servo feed
system are completed based on Simulink. The effect of nonlinear factors such as backlash and friction, are considered
sufficiently in the modeling process of virtual machine tool. The validity of machine tool model is verified by simulation.
Experimental setup is built to test the motion control ability in the process of circular interpolation, using the proposed
test approach. The results of the experiment prove the validity of the test method. The machine tool model set up in this
paper can comparatively accurately exhibits the kinematics characters of the real machine tool, and the proposed test
method provides a new way for the comprehensive and reliable test of the motion control ability of the CNC system.
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