Mitutoyo QM-Height QMH-350BX - Measuring the Outside Diameter

27
2 Basic Measuring Methods
No. 99MAF600B
2.5 Measuring the Outside Diameter
Measure the diameter (outside diameter) of a cylinder. By scanning the upper and lower surfaces of a
cylinderwiththestylus,thepeakpointscanbedetected.Thediameteriscalculatedfromthedi󰀨erence.
The diameter of a semicircle where part of the top or bottom of the hole is missing cannot be obtained.
This section explains the measurement procedure using the surface plate as the origin (ABS measure
-
ment system) and using automatic termination.
Highest
point
Lowest
point
Origin
(ABS measurement system)
1
Check the setting for the termination method of the scanning measurement (automatic termi-
nation or manual termination).
For details about the setup method, see "3.3 Setting the Termination Method of Scanning Measure-
ments" on page 44.
Tips
If the scanning measurement is set to be terminated manually, the procedures in step 4 aredi󰀨erent.
2
Set the surface plate as the origin (ABS measurement system).
For details about the setup, see "2.1.1 Setting the Origin and the Reference" on page 12.
3
Press [Outside diameter measurement].
M1 M2
» An icon will be displayed in the upper left of the LCD.
4
Detect the lowest point of the cylinder.
• If [Auto] (automatic termination) is set, ensure that the stylus is positioned to pass through the
lowest point of the cylinder. When the stylus is raised about 0.5 mm from the lowest point of the
cylinder, a beep sound will be made, and the peak-point detection will automatically terminate.
• Bring the stylus into contact within 0.5 mm of the lowest point. Measuring with a wider range may
increase measurement errors.
1 Turn the probe unit up/down wheel, and
slowly bring the stylus into contact near the
center of the bottom surface of the cylinder
until there is a "beep" sound (keep the stylus
in contact with the surface).
» [0.000] will be displayed on
the LCD.
A video about outside diam-
eter measurements can be
viewed.