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No. 99MBC095A
3.2.5 Measurement of an odd-numbered-edge cutting tool
• This function is used to measure the diameter or run-out of cutting tool (drill or end mills,
etc.)that has an odd number (3, 5, ...) of cutting edges.
• When the outside diameter, øD, of an odd-numbered-edge cutting tool is measured, the
measurement errors as shown in the figure below will result if this LSM unit is set to
Segment 2 (normal outside diameter measurement) for measurement.
To avoid these errors, in this case, first install the reference bar as shown below, then
perform the measurement while rotating the odd-numbered-edge cutting tool. Calculate the
outside diameter of the odd-numbered-edge cutting tool by obtaining the difference
between “Peak value of Segment 2+3” and “Bottom value of Segment 3” while the cutting
tool rotates more than one turns from the beginning of measurement.
Then save the bottom value of Segment 3 into memory as many as the number of cutting
edges being set, and calculate the range (maximum - minimum) as the “run-out”.
Reference bar
Odd-numbered-edge cutting tool
øD
Segment 2
Segment 2+3
(maximum value)
Error
Segment 3
(minimum value)
• For the measurement examples and setup method refer to Section 5.3.6 “Application of the
odd-numbered-edge cutting tool measurement”.
TIP • As shown in the figure at the right it is also possible to measure with the reference
bar being located in the Segment 1 side.
In this case the “outside diameter”
of the odd-numbered-edge cutting
tool can be calculated by obtaining
the difference between “Peak value
of Segment 1+2” and “Bottom value
of Segment +1” while the cutting
tool rotates more than one turns
from the beginning of measure-
ment.
Also, the “run-out” can be calcu-
lated by saving the bottom value of
Segment 1 into memory as many
as the number of cutting edges
being set to Segment 1, and calculate the range (maximum - minimum).
• It is necessary to select, in the basic setup, whether the reference bar is located in
the Segment 1 side or in the Segment 3 side.
Reference bar
øD
Odd-numbered-edge
cutting tool
Segment 2
Segment 1+2
(maximum value)
Error
Segment 1
(minimum value)
