• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA309C0940GYZ
  • Topic ID: id_2015787 Version: 1.23
  • Date: Apr 23, 2020 8:51:32 PM

Leveling the dockable table

Adjusts the table caster heights to make the tabletop level.

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1-15 minutes-
Tools and test equipment
ItemQuantityPart numberManufacturer
150 mm Plastic Dial Caliper with Metric Readout15916010-
Nonmagnetic Titanium Service Tool Kit, Small Set15113258-
Scissor Jack15437045-
Consumables
ItemQuantityPart numberManufacturer
Loctite #243As required5415261-3-

Procedure

  1. Move the cradle inside the bore.
    Note: If the cradle will not move into the bore, roughly adjust the table top height (Adjusting the dockable table top height) or the table center (Centering the dockable table) to allow the cradle to go into the bore far enough to make the required measurements.
  2. Measure the distance from the horizontal bearing surface to the laser line at the labeled locations.
    Note: Measure approximately 60 mm from the edge of the bridge or table to avoid the profile change.
    Figure 1. Level measurement points
    1Measurement point D
    2Measurement point C
    3Measurement point A
    4Measurement point B
    Figure 2. Vertical measurement
    1Laser
    2Vertical measurement
  3. Enter the measurements in the Table Height - Run 1 table on the Table Leveling&Height sheet of the Alignment Data Sheet Macro.
  4. Raise or lower the casters as indicated by the Leveling Calculator table as follows:
    1. Undock the table and move it out of the magnet room.
    2. Remove the caster linkage pin.
      Figure 3. Caster adjustment
      1Collar bolt
      2Caster collar
      3Caster shaft
      4Caster linkage pin
      5Wheel lock lever
    3. Remove the bolt securing the collar to the table.
    4. Slide the collar down the caster shaft until it rests on top of the caster shaft housing.
    5. Rotate the wheel lock lever to the Full Lock position.
      Figure 4. Full Lock position
      1Steer lock
      2Free swivel
      3Full lock
    6. Raise the table with the scissor jack so that the caster being adjusted is off the floor sufficient for adjustment.
      Note: Position the scissor jack under a solid surface at the bore or handle end of the table such as the examples shown.
      Figure 5. Scissor jack location examples
    7. Turn the caster as indicated by the Leveling Calculator table.
      Note: Turn clockwise to raise the table (green up arrow on macro) and counterclockwise to lower the table (red down arrow on macro).
      Note: Caster must be rotated in full rotations so the collar returns to its home position.
    8. Rotate the wheel lock lever to the Free Swivel position.
    9. Slide the collar up the caster shaft.
    10. Apply Loctite #243 to the threads of the collar bolt.
    11. Install the bolt securing the collar to the table.
    12. Apply Loctite #243 to the threads of the caster linkage pin.
    13. Install the caster linkage pin.
    14. Lower and remove the scissor jack.
    15. Move the table into the scan room and mechanically dock the table.
  5. Repeat Step 1 through Step 4 until the Difference cells in the Table Height - Run 1 table are green.
  6. Measure the vertical distance between the dock boss and the table boss on the left and right sides.
    Figure 6. Docked boss measurement
    1Dock boss
    2Table boss
  7. For the Installation and Calibration Wizard (ICW), reference the table below and record the difference in height between the bosses.
    Note: For systems with multiple tables, record the worst case.
    Table 1. Acceptable table boss measurements to record for ICW (Pass)
    The value is positive if the table boss is higher than the dock boss.

    The value is negative if the table boss is lower than the dock boss.

    Left side measurementRight side measurementValue to record
    +10+1
    +1+1+1
    0+1+1
    000
    -10-1
    -1-1-1
    0-1-1
    +1-10
    -1+10
  8. Record the measurement for ICW.