Using geometric measurements in combination with shaft alignment, will allow you to address many of the root causes of outages as part of a complete preventive maintenance program. In the rectangular flatness program e g, you will find it is particularly beneficial to combine such a measurement with shaft alignment when installing rotating machinery. First you check the foundation’s surface for possible irregularities, a so called pre-alignment check. If the foundation is perfectly flat, install the machine and check for possible misalignment with the NXA Ultimate.