Stepped Hole ID Measurement System

The system is intended for non-contact scanning and inner diameter measurement of objects having two through-holes of different diameter.

Stepped Hole Inner Diameter Measurement System

Name of parameter Value
Measurement range (1st hole), mm 15...40
Measurement range (2nd hole), mm 50...70
Measurement accuracy, um ±0,02
Measurement accuracy, um ±0,005
Space resolution (points/turnover) 6400
Light source red semiconductor laser, 660 nm wavelength
Laser output power, mW <1
Laser safety Class 2  (IEC60825-1)
Laser beam shape Round
Output interface Ethernet (UDP)
Power supply, V 9…24
Power consumption, W 4 (standby mode), 20 (scan mode)
Environment resistance:
  Enclosure rating IP67
Vibration 20g/10…1000Hz, 6 hours, for each of XYZ axes
Shock 30 g / 6 ms
Permissible ambient light, lx 30000
Relative humidity 5-95% (no condensation)
Operating ambient temperature, °С 0…+45
Storage temperature, °С -20…+70
Housing material aluminum, glass
Weight (without cable), gram 1500 gram


Operation of the internal diameter measurement system is based on the scanning of the hole surface by laser rotation sensors.

The system contains the two stages measuring head with three laser sensors inside, Figure 1.

RF096-15/40-50/70 Figure 1
RF096-15/40-50/70 Figure 1

Figure 1. System structure

The first stage is intended for measurement of hole with 15...40 mm diameters and contains one laser sensor (sensor #1 on the figure 1) with measurement range of 6...21 mm from the head axis..

The second stage is intended for measurement of holes with 50...70 mm diameters and contains two laser sensors (sensors #2 and #3) with shifted and overlapped measurement ranges, 24...31 mm and 30...37 mm from head axis.

The measuring head is mounted on the rotation module.

Radiation of a semiconductor lasers from the sensors is focused onto the object surface. Radiation reflected by the surface is collected by input lens of the sensors. Rotating laser sensors scan the inner surface of the object, and the system transmits polar coordinates of the surface (distance from the rotation axis measured by the sensors and a corresponding angle of rotation) to the PC for calculating the required geometric parameters. Overall and mounting dimensions of the system are shown in Figure 2.

RF096-15/40-50/70 Figure 2

Figure 2. Overall and mounting dimensions of the system

Order information for Wheel Center Bore Inner Diameter Measurement System


Symbol Description
D1min/D1max ID measurement range (1st hole), mm
D2min/D2max ID measurement range (2nd hole), mm

Example: RF096-15/40-50/70 – Inner Diameter Measurement System For Stepped Holes RF096, measurement range: 15...40 mm (1st hole), 50...70 mm (2nd hole).

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