49-85/86/87
18
Rev.E
4.
For Model 49-85 and 49-86:*
The readings must be within 0.00004 in. of each other for the anvil and the pressure foot to
be considered parallel and no adjustment needs to be done.
For Model 49-87:*
The readings must be within 0.0002 in. of each other for the anvil and the pressure foot to be
considered parallel and no adjustment needs to be done.
5.
If the parallelism measurements, as described in Section 9.2
–
Steps 1 and 2, do not fall
within the tolerance range, the anvil needs to be adjusted. Underneath the base plate, there
are three leveling screws that attach the anvil to the base plate. Use an Allen key to adjust
the leveling screws while securing the nut with a 3/8 in. wrench.
For Model 49-85 and 49-86:*
Adjust the leveling screws until all readings are within .00004 in. (.001 mm) across the
anvil’s surfaces.
For Model 49-87:*
Adjust the leveling screws until all readings are within .0002 in. (.005 mm) across the
anvil’s surfaces.
When the adjustments are completed, recheck the parallelism.
* For instruments 49-86-00-0003 and 49-87-00-0003 perform three sets of readings, adjusting the
screws each iteration in order to establish a baseline parallelism. Only perform this parallelism
adjustment if measurements with gauge blocks placed in the visual center of the anvil are outside
the tolerances of the instrument’s calibration record.
MAINTENANCE
The TMI Digital Micrometers
–
49-8X Series do not require oiling or special maintenance. A rise in
operating temperature is expected. The temperature will rise until it reaches operating temperature.
Keep the instrument clean and in an environment that is free of dirt and dust. For consistent test
readings, it is very important that the anvil and pressure foot are kept clean.
If the instrument is not in use for an extended period of time, a plastic cover should be used to protect
it from dirt and other foreign matter. The pressure foot and the anvil should not be in contact for
extended periods of time. Place a piece of paper, film, etc. between the pressure foot and anvil.
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