Sounds high to me, I get .078" for 2mm. Is the offset purely in one direction or just on one end of what you are aligning?

I am aware of multistage blowers requiring a cold misalignment to allow for thermal growth on one end of the blower but the amount they require in my experience is less than .020"

Dave

Are you aligning to a planetary or a parallel shaft unit?  In addition, is the unit coupled to the generator a foot mount or a centerline mount?

John, Planetary.  Looks like 2mm vertical offset is correct!

Dave,

wind turbine and 2 mm is correct! I told the crew to put their laser on it cold and watch the thermal growth.

The results are in !!!  2.0 mm offset was dialed into the laser with the wind turbine cold.  Ran for 1 hour to come to temperature and the final offset was just 0.11 mm!!!  I love it when science works.

@Registered Member posted:

John, Planetary.  Looks like 2mm vertical offset is correct!

In a planetary arrangement (fixed annulus/ring) the gearbox may also have an alignment fixture so check with the OEM.

Correct.  It is a fixture that rotates so you don' t need to rotate the gearbox shaft, which would be almost impossible, considering the blades would still be out there sitting in the wind!