GE Healthcare eXplore Locus SP, Service Manual

Page: 210 / 266

GE H
EALTHCARE
D
IRECTION
5158821-100, R
EVISION
3
E
X
PLORE
L
OCUS
SP S
ERVICE
G
UIDE
Page 210
18. Adjust the tip on the Precision Dial Indicator to strike the equator of the ball. Make sure the
Indicator is not pegged (i.e. the small needle on the gauge, near the centre of the Dial Indicator,
is around the halfway mark).
Note: The Precision Dial Indicator is very sensitive and care should be taken not to lean or touch any
part of the system while adjusting the Indicator or the X,Y Centring Ball tool.
19. Zero the Precision Dial Indicator.
Note: For fine measurements, the Precision Dial Indicator may not be accurate until after the first
movement.
20. Use the Rotation setting in X-Ray and Motor Controller to rotate the ball 360° (180° at a time).
Watch as the ball is rotating to ensure that the tip of the Precision Dial Indicator is touching the
ball at all points of rotation and that it is not pegged. Re-zero the Dial Indicator, if necessary.
Centre the Ball:
21. Use the Rotation setting to rotate the ball 180°.
22. Watch the Precision Dial Indicator as the ball rotates. Note the reading of the Precision Dial
Indicator after 180° of rotation (e.g. .0004").
The objective is to adjust the ball so that, after the adjustment, the Dial Indicator reads half of
the original reading (e.g. .0002").
To do this:
23. Use the tool’s adjustment key to carefully turn the 2 adjustment screws that are aligned with
the Dial Indicator - turn the screws until the Dial Indicator reads half of the original reading.
NOTICE
Equipment
Damage
Possible
The tool is extremely delicate. Fine
adjustments are required. DO NOT
overtighten the screws. One screw
turns clockwise and the other turns
counter clockwise. Turn the screws in
tandem using as little torque as
possible (i.e. 5° at a time).
24. Once adjusted, rotate the ball 180°
and check the Dial Indicator reading.
It should match the reading taken
after the adjustment in the previous
step (e.g. .0002").
25. Re-zero the Dial Indicator.