STT-shaft twist tester NV

Twist testing on the screen

Twist test on the monitor with industrial camera solutions

Twist structures can be distinctly different over the whole seal seat circumference. The local dependency is characterized by varying portions of roughness and waviness. Consequential the periodicity of the twist structure is disturbed. However the partitions of the seal seat surface with dominating twist structures cause leakage. In this case a 100%-inspection of the surface over the circumference is recommended. Especially long wave twist structures (DP 200μm) are difficult to prove. The disturbed periodicity leads to a non continuous stripe pattern. Above a period length of 200μm the spacing between the diffraction lines is very small and it is difficult to resolve it with human eye.

The pictures recorded by the video camera are magnified by a factor 4 and displayed on a screen. That leads to a clearly improved resolution of long wave twist structures (200μm - 500μm). The STT R100 NV is principally designed for the stationary 100%-inspection of seal seat surfaces close to the manufacturing process and is connected to a video camera and a screen. The Video camera can also be readout by a PC via a standard TV tuner card. The disturbed diffraction lines pattern can be compacted to standing lines, while rotating the shaft between centres or in the lathe chuck, which indicates the presence of twist.

Product pictures

STT-NV

Application background

Measurement method

STT twist test

Twist structures can be distinctly different over the whole seal seat circumference. The local dependency is characterized by varying portions of roughness and waviness. Consequential the periodicity of the twist structure is disturbed. However the partitions of the seal seat surface with dominating twist structures cause leakage. In this case a 100%-inspection of the surface over the circumference is recommended. Especially long wave twist structures (DP 200μm) are difficult to prove.

The disturbed periodicity leads to a non continuous stripe pattern. Above a period length of 200μm the spacing between the diffraction lines is very small and it is difficult to resolve it with human eye. The pictures recorded by the video camera are magnified by a factor 4 and displayed on a screen. That leads to a clearly improved resolution of long wave twist structures (200μm - 500μm). The STT R100 NV is principally designed for the stationary 100%-inspection of seal seat surfaces close to the manufacturing process and is connected to a video camera and a screen.

The Video camera can also be readout by a PC via a standard TV tuner card. The disturbed diffraction lines pattern can be compacted to standing lines, while rotating the shaft between centres or in the lathe chuck, which indicates the presence of twist.

STT-shaft twist tester Product video

Optional Accessories

Battery charger for STT
  • Battery charger for STT
  • Charger + 2x battery
  • Voltage (batteries): 3.6 volts (lithium-ion battery)
  • High-quality universal 2-channel charger
  • LED status display
  • This item fits the following models: STT NO, STT NK, STT NV

Specifications

Technical information

  • Optical twist tester with video camera for live image transmission on a monitor
  • 4 times enlarged image of the spread pattern to resolve long-wave twist structures (DP> 200μm)
  • PAL composite video signal (optionally also with USB connection)
  • Twist period measuring range: DP 20 - 200 μm
  • Twist depth: Dt> = 200 nm *
  • Axial back focus: 15 mm
  • Shaft diameter: 5 - 200 mm
  • Illumination source: laser diode module laser class 2

 

* Information for Rz = 2 μm & nbsp; (information depends on roughness and twist period, permissible roughness. Ra 0.1 - 0.5 μm)

Marketing & Sales Contact

Tel: +49 (0) 3641 79799 00  |  Fax:+49 (0) 3641 79799 01  E-mail: info[at]matesy[dot]de  |  Web: www.matesy.de

 

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