The Development Of Numerical Control System Of Gear Measuring Center Based On Turbo PMAC2

Gear measuring center was developed by the electronic generating method sincethe eighties of the twentieth century and is a high-tech gear meter with optical、mechanical and electrical. Its three major units are the mechanical system, controlsystem and computer software. Gear measuring centers, can not only measure gearsbut also measure the complex tool, worm, cam, crankshaft, and other complex parts.Because, it is fast and has high accuracy and strong function so it can measure anumber of parameters automatically once clamping on the workpiece.The paper first review gear measuring center at home and abroad and thecurrent state of development of numerical control technology control, and analyzethe structure of the gear measuring center and its numerical control systemcomposition, structure and control performance requirements. On the shortcomingsof the current control system, the paper put forward open CNC motion controlplatform to improve the overall program based on Turbo PMAC2.The Turbo PMAC2is the core of the control system, and the application ofdouble-loop analog output control mode. Double-loop analog output control makeservo system more accurate positioning, faster dynamic response and more soft anddelicate. Actuators three straight axis use the panasonic A5motor and supportingdrive, and the rotation axis use Kollmorgen direct drive motor and the Servostardrive. In the Turbo PMAC2platform develop the bottom library PLC program andthe upper machine communication link library software, which include four-axisjoystick movement, probe protection, high or low speed, linear interpolation andspline interpolation functions and so on. Because Turbo PMAC2controller useEthernet communication with the host computer, and its own data acquisition systemcan not meet the test requirements, so we develop a set of raster data acquisitionsystem. FPGA is the core of the system, which analysis of the grating sensorprinciple, develop of hardware circuitry and use the Verilog HDL language programming grating filter, four subdivision and reversible counting which aresimulated and tested. The data acquisition circuit can latch the probe signal and fourgrating signal at the same time lock, and timeshare transmission to the PC throughthe PCI bus interface.The paper masure and test the actual control of the servo system performanceand the instrument performance. The experimental results show that the improvedcontrol system improve the instrument measurement accuracy and stability.