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g. Fixing screws:
All fixing screws should be treated with high temperature thread lubricant.
4.1.7 Adjustment of the XY slides
a. If play develops in the XY slides, three adjustment screws are provided on each axis. The X slide
adjustment screws are located below the Y axis micrometer (or motor). The Y adjustment screws are
on the side of the top plate, on the same side as the shipping pin.
b. Before adjusting these three screws, it is first necessary to loosen the screws which retain the
bearing closest to the adjustment screws.
c. Check that the roller cage between the slides is centrally positioned along the length of the slide.
d. Tighten the middle adjustment screw first, to finger tight only. Then tighten the outer adjustment
screws, to finger tight.
e. Finally, tighten the bearing retaining screws.
4.2 CORRECTIVE MAINTENANCE
4.2.1 Guidelines for dismantling and re-assembly
a. Centralize the XY stage and retract the Z slide, but leave the knee at least 25mm away from the
limit positions.
b. Disconnect all power and instrumentation and remove the OMNIAX from the vacuum chamber.
c. Bolt the Omniax to a suitable stand that allows it to be worked on securely in the vertical position
(such as the transit stand supplied with the translator).
d. Note the orientation of parts as they are dismantled: i.e., disk (or Bellville) spring washers under
screw heads, the orientation of bearings and tubes.
c. When reassembling always fit new copper gaskets.
f. Apply thread lubricant to all fixings which are not in-vacuum but do not allow contamination of the
vacuum with thread lubricant.
g. Replace parts in their original orientation.
4.2.2 Removal of the central assembly
(i.e.: support tube + sample holder + Z bellows +
rotary drive or other equipment fitted above the
knee).
a. All sample handling equipment must either be
removed from the bottom of the manipulator, or be
able to pass through the support tube bearing: i.e..,
through a bore equivalent to the outer diameter of
the support tube. It will be necessary to remove the
radial screws which retain the rotary
drive bearing housing.
b. Remove the Z drive hand wheel or motor.
Loosen the grub screw holding the knurled nut on the
Z
drive worm shaft (see diagram below). Unscrew this
nut by about two turns relative to the spacer
which has a radial hole. This will
introduce end play to the shaft
