Define and document functional relevant surface structures
The requirements on a sealing surface varies in relation to their application. Therefore it is not possible to specify universally valid and explicitly tolerable surface parameters for the sealing surface. Nevertheless the sealing property of a shaft is conditioned by the roughness and the waviness of the surface. This functionally relevant overlap of roughness and waviness is visualized within an illuminated surface region of 2mm x 2mm by the Shaft Twist Tester. The roughness causes a characteristic scattered light distribution, whereas the waviness generates a stripe pattern in the test picture.
The device STT R100 NK which is connected to a digital camera captures and stores the characteristic scattered light patterns. By the use of the standard bajonett mount Micro-Four-Thirds (MFT) it is possible to connect the STT to every standard digital camera with MFT adapter. Via the LCD-display of the camera, the inspection takes place in the live image mode. The recorded pictures can be transferred to a PC through a USB-connection. The provided software makes the inclusion of the pictures into an inspection sheet possible. Using application-specified sealing surface samples (leak proof, leaky, limiting case) reference pictures of scattered light can be stated and used as reference samples for the quality inspection.production conditions. Additional the device STT R100 NO provides the possibility to connect a tripod (1/4” 20 UNC).
The requirements on a sealing surface varies in relation to their application. Therefore it is not possible to specify universally valid and explicitly tolerable surface parameters for the sealing surface. Nevertheless the sealing property of a shaft is conditioned by the roughness and the waviness of the surface. This functionally relevant overlap of roughness and waviness is visualized within an illuminated surface region of 2mm x 2mm by the Shaft Twist Tester.
The roughness causes a characteristic scattered light distribution, whereas the waviness generates a stripe pattern in the test picture. The device STT R100 NK which is connected to a digital camera captures and stores the characteristic scattered light patterns. By the use of the standard bajonett mount Micro-Four-Thirds (MFT) it is possible to connect the STT to every standard digital camera with MFT adapter. Via the LCD-display of the camera, the inspection takes place in the live image mode.
The recorded pictures can be transferred to a PC through a USB-connection. The provided software makes the inclusion of the pictures into an inspection sheet possible. Using application-specified sealing surface samples (leak proof, leaky, limiting case) reference pictures of scattered light can be stated and used as reference samples for the quality inspection.production conditions. Additional the device STT R100 NO provides the possibility to connect a tripod (1/4” 20 UNC).
Device overview
Optical twist test
Twist test with digital camera
Twist test with video camera
• Measuring range: DP 20 - 500 μm
• Twist depth Dt> 200nm *
• Axial back focus: 15mm
• Shaft diameter: 5 - 200mm (STT R150 N 300mm)
• Illumination source: class 2 laser diode module
• Power supply: 6 volt battery
• Weight: approx. 600g
• Digital camera (optional)
* Depending on roughness and twist period, permissible roughness Ra = 0.1 - 0.5 µm
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