linear guide assembly linear bearing slide linear motion ball bearings LINEAR GUIDE ASSEMBLY In NSK, every linear guide assembly, the mounting bolt holes are processed after heat treatment using a precision machining center; therefore, the bolt hole pitch accuracy is as good as the positioning accuracy of the machine, which is considered very good. When tightening the bolts, be sure to start at one end and work in order to the other end. If the bolts are tightened at the middle first, it tends to leave the linear bearing rails curved. If you suspect this has happened, loosen the bolts and start again. The rail that has been tightened can now be used as a reference rail. Using a vernier calipers or other accurate tool, measure the distance between the two linear bearing rails, and adjust each end until they are the same. Tighten a bolt snugly at each end of the rail. Move the table to one end of the linear bearing rails, and start tightening the adjusting rail bolt sequentially to the specified torque while checking excessive friction of table movement. Continue moving the table down the rail tightening each adjacent bolt until they have all been tightened.