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    					| A New Approach for Measuring Part Coodinate of Touch-Trigger Probe Based on Measurement Kinetics Modeling | 
  					 
  					  										
						| LI Jun1, JIN Qichao1, CHEN Zezhong2, FANG Tao3, HE Zhaoxia1 | 
					 
															
						1. Chang’an University, Xi’an 710000, China; 
2. Zhejiang Advanced CNC Machine Tool Technology Innovation Center, Taizhou 312115, China; 
3. Northwesternern Polytechnical University, Xi’an 710072, China | 
					 
										
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													     		                            						                            																	    Abstract   During the coordinate measurement and surface quality inspection processes conducted by touch-trigger probe on CNC machine tools, conventional measurement methodologies demonstrate suboptimal efficiency when acquiring workpiece coordinates for components with predefined surface coordinate ranges. To address this problem, an axial measurement coordinate optimization method based on kinematic modeling of the probe-workpiece interaction is proposed. First, based on the kinetics model of the CNC control system and the probe measuring mechanism, a probing kinetics model and a measuring error model are built. A high feedrate measuring error compensation method is proposed. Then a group of tests are carried out with a Renishaw OMP probe on a Bridgeport vertical milling machine to verify this proposed approach. The tests results demonstrate that this approach can precisely measure parts coordinates in high feedrate. Compared to the existing methods, this method reduced the measurement time for workpieces from 9.36 s to 0.36 s with the same measuring precision. 
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															| PACS: V261.2 | 
																				
																			 
																		
															
														
																																									    																														 
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