MicroE Mercury II 6000V - Manual (Page 59)

Page 4 Section B - Linear Glass Scale Installation
Mounting Surface Preparation
B1.0
Inspect the mounting surface for any machining
irregularities. MicroE Systems recommends a surface
finish of better than 3.2 micrometers Ra.
B1.1
MicroE Systems recommends a mounting surface
flatness of 0.0001 inch/inch.
B1.2
Thoroughly clean the scale mounting surface and
reference edge using a cotton swab or lint-free cloth
dampened with isopropyl alcohol or acetone.
Remove all dust and particles.