GridLOK enhances measuring accuracies since all measured points are in absolute dimensions relative to the same part origin with no accumulative error regardless of how many times the portable CMM was moved. This replaces the old "leapfrog" method which caused an accumulative deterioration of accuracy every time the CMM was moved. GridLOK volumetric accuracy is equivalent to the laser tracker accuracy used for the certification of the system upon installation plus the ROMER portable CMM accuracy. The grid has a volumetric repeatability of ± .002 in. Arm mounting options (i.e. magnetic base or Brunson stand) can contribute no more than ± .002 in. volumetric uncertainty. Neither the grid nor mounting options affect arm accuracy.











































The system uses small (5/8 in.) diameter conical seats flush mounted in a concrete floor or steel plate at about three foot intervals. The conical seats are then certified by a laser tracker provided by ROMER. This is a one-time event after which the laser tracker is no longer needed. After that, operator simply touches any of the standard ball probes into three different conical seats and, magically, the portable CMM arm is locked into the common origin. That is the complete training instruction. This phenomenal "lock-in" event takes less than five seconds and works even in the middle of a measuring sequence. Moving the arm and locking-in requires no program interruption, no button pushing, and no keyboard selections ... it's automatic!

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