Bowers Group Trimos Mestra Height Gauges User Manual

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5.3 Diameter and centerline distance measurements

1. Set the display at zero or at a preset value on a

reference surface (see § 6.1 and § 6.6).

2. Select the diameter / centerline mode by pressing the

Functions key (the pointer must be situated next to
the corresponding symbol).

3a. Internal diameter:

Position the measuring insert into the bore and set it
off center on the lower profile (1). Engage the
measuring force until confirmation of the measurement
by the green direction arrow and a simultaneous
acoustic signal. Move the instrument (or the part)
laterally to determine the reversal point (2). The
reversal point is stored automatically.
Note: The probing indicator (at the left side of the
digital display) must always be in the green zone when
searching for the reversal point.

4a. Move the measuring insert straight up and set it on the

upper profile (3). Engage the measuring force until
confirmation of the measurement by the green
direction arrow and a simultaneous acoustic signal.
Move the instrument (or the part) laterally to determine
the reversal point (4). The diameter value is displayed.

3b. External diameter:

Set the measuring insert off center under the lower
profile (1). Engage the measuring force until
confirmation of the measurement by the green
direction arrow and a simultaneous acoustic signal.
Move the instrument (or the part) laterally to determine
the reversal point (2). It is automatically stored.
Remove the measuring insert slowly to the side, off
center.

4b. Set the measuring insert off center top of the upper

profile (3). Engage the measuring force until
confirmation of the measurement by the green
direction arrow and a simultaneous acoustic signal.
Move the instrument (or the part) laterally to determine
the reversal point (4). The diameter value is displayed.

5. Remove the measuring insert. The function pointer

moves automatically to the centerline symbol and the
value of the centerline will be displayed. Both values,
diameter and centreline distance, are memorized and
displayed in the buffer (DIA and CEN).
A zero setting or a preset value can be assigned to the
centreline.