Basics of Coordinate Metrology
Unit 8: Types of Coordinate Measuring Machines - Bridge Type

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Coordinate measuring machines of the bridge type are the most widely used coordinate measuring machines. They are used for measuring tasks even when high precision is required, because they encompass the entire range of machine tools.

For medium to large measuring volume, they are distinguished by high rigidity and thus small measuring deviations. The high rigidity is based on the compact bridge design. The disadvantage of this type is the limited accessibility caused by the bridge.

The bridge type is found in two different designs:
   
  • Bridge measuring machine with stationary bridge and moving table (e.g. ORION 5, SIP)
    • The high rigidity of the overall structure leads to small measuring uncertainty
    • Table load is restricted due to acceleration
         
  • Bridge measuring machine with stationary table and moving bridge (e.g. XCEL, Brown&Sharpe)
    • Compact design allowing high table loads
    • Large clamping surface