Marc, Matteo

During the measurement of ETMY HR surface absorption we had to make large Z motions to move ETMY around safely.

At one point, the Z position got stuck at the away sensor position on Z.

We found that this was due to the fact that the 2 translation stages along Z have a little shift between them. This makes the 2 away sensors position slightly different on the 2 translation stages.

There was therefore a little twist between the 2 motors and the lockstep safety prevented any further motions (even when relaxing the lockstep twist tolerance).

The solution was :

Remove the lockstep

Move the motor individually so that they have the same position

Put the lockstep back

Bring the 2 motors to the home position (this can be performed if the vertical position allows to go above the laser bench)