Axial Twist Texture Tester - Axial Rotation Surface Twist Defect Detector - ST R100 NV Product Description:

The sealing function of the STT R100 NV shaft seal is achieved by a threaded structure, commonly known as a helical seal, also known as a textured seal or viscous seal. This structure can be clearly presented by a shaft surface thread measuring instrument, where the number of diffraction fringes is an indicator of thread depth, and the distance between the diffraction fringes reflects the size of the pitch. The thread structure on the entire circumference of the sealing seat may be completely different. The characteristic of local dependence lies in the different parts of roughness and waviness, which cause periodic interference to the thread structure. However, the separation of the main threaded structure on the surface of the sealing seat can lead to leakage. In this case, it is recommended to conduct a 100% inspection of the circumferential surface, especially for long wave thread structures (DP 200 μ m). The periodic interference results in discontinuous stripe patterns. The period length exceeds 200 μ m, and the spacing between diffraction lines is very small, making it difficult for the human eye to distinguish. The Matesy STT R100 NV adopts an industrial camera solution, and the images recorded by the camera can be magnified by 4 times and displayed on the screen, significantly improving the resolution of the long wave thread structure (200 μ m-500 μ m). The STT R100 NV is primarily designed for 100% static inspection of the sealing seat surface during the manufacturing process and is connected to cameras and screens. The camera can also be read out by a PC through a standard TV tuner card. When rotating the axis between centers or in the lathe chuck, the disturbed diffraction line pattern can be compressed into upright lines, indicating the presence of a threaded structure.

Product Highlights:

• Equipped with Watec WAT-231S2 camera
• Real time mode can be transmitted to the screen
• 4x magnification image analysis of long wave thread structure (DP>200 μ m)
• Pixel count 752 x 582
• PAL composite video signal
• Optional USB connection

Application scope：

• ABS braking system
• Power control system
• Fuel pump shaft
• Fuel injection system
• Engine valve
• spark plug
• Electric engine spindle
• transmission shaft
• fastener
• turbine

Upgrade options:

• STT battery charger
• Charger+2x batteries
• Voltage (battery): 6 volts (lithium-ion battery)
• High quality universal 2-channel charger
• LED status display
• This applies to the following models: STT NO，STT NK，STT NV

Technical parameters:

• Measurement range: DP 20-500μm
• Thread depth: Dt> 200nm *
• Axial back focal length/axial length of contact surface: 15mm
• Shaft diameter: 5-200mm (STT R150 N 300mm)

(Depending on the roughness and thread period, the allowable roughness Ra is 0.1-0.5 µ m)

• Lighting source: Class 2 laser diode module
• Power supply: 6V battery
• Weight: Approximately 600g
• Digital camera (optional)

The following figure shows the diffraction patterns generated by the non threaded structure (left) and the threaded structure (right).