Periodic Maintenance Tasks
Axis Bearing Adjustment and Backlash
Backlash is the amount of movement the screw makes before the table engages. There are a number of
signs that may indicate that there is excessive backlash with your system:
Rough/uneven surface finishes
Dimension inaccuracies
Table shakes under machining force
Even if none of these signs are present, it is recommended to check for backlash compensation every 3-
6 months depending on your usage of the machine. Please note: Siemens 808D Software has provisions
that compensate for backlash within the program. This section of the manual is addressing mechanical
backlash compensation. There are four main mechanical reasons for backlash:
1. Preloaded ball nut is damaged and is causing axial play between the nut and the screw. If the
ball nut is damaged, the only solution to this is to replace the ball screw and ball nut assembly.
2. The end support bearings are damaged. If you find that the end bearings are damaged, follow
the procedure below for replacing the bearings.
3. The ball nut mounting screws are loose. Tighten the bolts and make sure the bolts or housing
threads are not damaged before tightening.
4. The end bearing tightening nut is loose.
Linear Motion Guide & Bearing Maintenance
Unlike dovetail guide ways, linear motion guides are free from wear. It requires neither adjustment of
the gibs due to uneven wear nor maintenance to restore the original accuracy. Linear guides use a
forced lubrication system to provide and maintain a uniform film over moving parts.
This not only
prevents smoother motion but assures less maintenance than other systems.
Linear guide ways
require constant lubrication in a very small quantity, all handled effortlessly through the automatic oiler.
There are no adjustments required for such bearings and guides.
Make sure the linear bearings are not splashed with coolant directly, the lubricant may be contaminated
or compromised if it comes in contact with coolant. Coolant may wash off or emulsify the lubricant
significantly degrading the lubrications performance. Once sign of such case is the increased noise when
the Z axis slide moves up and down at high speed. Make sure lubrication supply is present by checking
the ends of the lubrication supply piping for the proper oil flow.
Machine Operation - Quick Start Guide
Keyboard Layout
1. Horizontal Soft Keys
2. Vertical Soft Keys
3. Alpha Keypad
4. Numeric Keypad
5. Navigation/Help Keypad
6. Programming Keypad
