The radial deviation of a cutting disk during veneer production is measured using a laser triangulation sensor to ensure quality. The sensor measures the disk with a diameter of 3200mm rotating at 180-210rpm in a dusty environment. It provides precise measurements at 5kHz to monitor the disk's radial deviation and ensure the veneer strips have a consistent thickness under 1mm with micrometer tolerances. The sensor housing protects it from dust and chips while maintaining high accuracy over the large base distance and shiny, fast-moving surface.

1. Measurement of the radial deviation of a cutter disk
During the manufacture of veneer strips from laminated wood, the precision of the cutting disk
APPLIC A T ION
determines the quality of the final product. High demands are made on the veneer strips in
terms of dimensional conformance. The thickness of the strips must be less than 1 mm and
may only exhibit tolerances in the micrometer range. Thicker parts or splinters should never
occur. These "fractions" are only inadequately plastified during the later pressing process of
the veneer strips to form a plate material. Consequently, pores, which substantially reduce the
quality and strength figures of the veneer strips, occur in the plate cross-section.
The quality of wood plate materials is determined by the quality of the chips or veneer strips.
The latter depends to a high degree on the precision of the cutting disk and the associated
tolerances (cast body, blade holder, slicing blade) under production conditions and loads.
To maintain the quality criteria the radial deviation of the cutting disk is measured and
monitored during the production process with a non-contact laser triangulation sensor from
the Series optoNCDT 1800.
This means that high demands are made on the measurement system: Dust, chippings and a
shiny target surface must not affect the measurement accuracy.
The cutting disk has a diameter of 3200 mm and is fitted with 24 blades. The rotational speed is
180 to 210 rpm. optoNCDT 1800 supplies constant measurement results even under these
difficult conditions. A protective housing protects the laser beam from dust and chippings
which could impair the measurement result by casting shadows. The integrated high
performance optical system ensures precise results, even at the high speed and with the
strongly reflecting surface of the cutting disk. The measurement results are output directly to a
PC via a serial interface for further processing.
Measurement system requirements
- Measurement range: 50 mm
- Repeatability: 5 µm
- Measurement rate: 5 kHz
cutter disk edge
Principle sketch
cutter disk carrier
Laser sensor
A132_e

2. Ambient conditions
- Medium: Air with dust and chippings
- Ambient temperature: 20 to 40 °C
- Vibrations: During the cutting process
- Interference fields: 3 frequency converters for 3 motors, each 0.75 to 1 kW
Reasons for the system selection
- High reproducibility on shiny metal
- Low noise at high circumferential speed (28 m/s)
- High accuracy at a large base distance
- Direct data transfer to a PC through a serial
interface
Assembly drawing measurement system optoNCDT 1800
IDL1800-50 - Laseroptical triangulation sensor with serial interfacce Rs232
SensorDAT 2000 USB - Software for signal conditioning and analysis
SGHF1800 - protective housing with a blow-free device for protection against dust and
chippings
CE1800-8 - sensor cable extension
PC1800-3/RS232 - supply/ output cable Rs232
Ps2010 - power supply 230 VAC/ 24 VDC
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