Mitutoyo QM-Height QMH-24"BX - 2.4 Measuring the Inside Diameter

24
2 Basic Measuring Methods
No. 99MAF600B
2.4 Measuring the Inside Diameter
Measure the diameter (inside diameter) of a hole. By scanning the upper and lower surfaces of a hole
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).
Origin
(ABS measurement system)
Highest
point
Lowest
point
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
The operation in step 4 di󰀨ersfor"automatictermination"and"manualtermination".
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 [Inside diameter measurement].
M1 M2
» An icon will be displayed in the upper left of the LCD.
4
Detect the lowest point of the hole.
• If [Auto] (automatic termination) is set, ensure that the stylus is positioned to pass through the
lowest point of the hole. When the stylus is raised about 0.5 mm from the lowest point of the hole,
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 slow-
ly bring the stylus into contact near the center
of the bottom surface of the hole 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 inside diam-
eter measurements can be
viewed.