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No. 99MBC032A
3. DISPLAYS AND KEY OPERATIONS
3.2.13 Automatic workpiece detection <OD detection method, Position detection method>
• Automatic workpiece detection is performed for continuous-run measurement, where
measurement starts with no specified workpiece present (Err-0), then proceeds to auto-
matic detection of the workpiece, followed by measurement repeated number of times. No
specified workpiece present (Err-5) also refers to the workpiece outside the upper and
lower detection limits.
• Whether automatic workpiece detection is performed is specified in the basic setup mode.
If automatic workpiece detection is specified, the number of scanning times for detection
must be specified from among 1 and 16. Select 16 times if detecting precision workpieces.
If automatic workpiece detection is not specified, no further setting is necessary.
• Automatic workpiece detection setup includes the number of measurement times, invalida-
tion period, upper and lower detection limits. Both the upper and lower detection limits
may not always need to be specified, however, they should be set for safety.
• To exclude the measured data of such as chamfered portion of the workpiece, invalidation
period can be set within the range from 0.001 sec to 9.999 sec.
No workpiece
detected
Start of
measurement
Detection of
workpiece
Invalidation
elapses
Measured the specified
number to times
1) OD detection method
• This is used to automatically detect a workpiece that enters the laser scanning plane
perpendicularly.
• For actual detection of a workpiece the displayed measurement (after calibration and
offset) is used.
• One session of automatic detection consists of no workpiece being detected, detec-
tion of a workpiece with a dimension that is within the detection range (between the
upper and lower detection limits), an invalidation period required to exclude invalid
dimensions (of chamfered portions, etc.) from the measurement, and effective
measurement for the specified number of times. The final measurement result will be
latched (held) on the display. Once entering the effective measurement the upper and
lower detection limits will no longer be checked.
• The speed of workpiece detection (i.e. the number of scans) can be specified as
either 1 or 16 in the basic setup.
• Use 16 times in the following cases:
* If connecting bars are used between workpieces for feeding convenience and for
setting appropriate intervals between workpieces, and, if the difference in the
outside diameter between the workpiece and the bar is insufficient.
* If the feed rate is low.
• The following diagram is an example where a workpiece with a chamfered outside
diameter of D mm and a length of L mm moves at a velocity of V mm/s.
D
a
L
c
g
Scanning beam
Workpiece flow V mm/s
