With VCS machine tool precision can be increased

1. V olumetric C ompensation S ystem ( VCS ) for 5 AXES VERTICAL GANTRY MACHINE WITH MOBILE BRIDGE

9. Step 2 VCS File From the geometric errors measured, the Renishaw Software directly generate the data file in VCS format to introduce in the Siemens 840D Control HOW to USE VCS SYSTEM // VCS-Format //----------- // [HEADER] MACHINE_PRODUCER = BRETON MACHINE_TYPE = FLYMILL 2T MACHINE_NUMBER = 0 CONTROL_PRODUCER = SIEMENS CONTROL_TYPE = 840D CONTROL_NUMBER = 0 CONTROL_SOFTWARE_VERSION = 6.5.39 CUSTOMER = RENISHAW OPERATOR = REICHLE DATE = 080129 TEMPERATURE = 23 COMMENT = komplett YTY] AXIS_LENGTH [L_U] = 2000 INTERVAL [L_U] = 200 REF_POS_X [L_U] = 1233 REF_POS_Z [L_U] = -683.5 MEAS_TOOL_Y [L_U] = 170 MEAS_TOOL_Z [L_U] = 110 DEVIATION [D_U] GRIDPOINTS = { 0.0 -1.9 200.0 -2.4 400.0 -4.15 600.0 -5 800.0 -6.9 1000.0 -9 1200.0 -8.4

10. VCS Compile Cycle installed Activate Sinumerik VCS functionality to compensate for the geometric machine error VCS file Measurements Step 3 CNC CNC Machine model HOW VCS SYSTEM WORKS

11. Verification of VCS Improvement by Diagonal Measurament HOW VCS SYSTEM WORKS Step 4 4 3 2 1 Y Z X

12. Qualitative Example of Volumetric errors before VCS activation

13. Qualitative Example of Volumetric errors with VCS compensation

14. DAILY VCS UTILISATION During the daily working operations VCS System taking the feedback from the machine, evaluate for each point of the trajectory the compensation to introduce, to have at the tool tip the maximum positioning and orientation precision. The VCS System don’t compensate the temperature variation errors. To have the maximum precision from VCS System the machine must be calibrated at least once in each season With Renishaw calibration system the calibration time is very reduced VCS system can’t be intended as a substitute fro a good mechanical design and build.