We are using FlexMotion, NI7344-FW, two stepper motors and .5 micron linear encoders to control a gantry over two stages. The steppers are usually geared in a 1:1 Master/Slave operation.
To help ensure that the master and slave are completely "in-sync" we typically disable the gearing between each move, re-adjust the slave, and then re-enable gearing.
This usually works perfectly, but periodically (less than .1% of moves) the slave loses 16mm of counts. This is about 32000 ticks that become lost.
Has anyone else experienced this problem? Can they suggest any work arounds?