Research on reverse engineering in coordinate measuring machine

The digitization of part prototype is a process that to get the geometry of the parts using a number of specific digital measuring tools.Based on a turbine blade,it discussed the steps and methods to obtain the three-dimensional data of the parts using a contact-type coordinate measuring machine(CMM).Through the steps of clamping parts,calibrating the probes and measuring rods,establish the workpiece coordinate system,measure the points and output the final data,it could obtain the three-dimensional data of the parts.Through an example,it proved the usability of this method.At last,the paper analyzed the measuring errors generated in the process and discussed the improve methods.The example proves that the precision of point-cloud could be improved by determining a reasonable measuring path,establishing an appropriate part coordinate system,choosing the appropriate number of measuring points and using uniform measuring force.