How to choose a suitable straightness measuring instrument?

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A straightness measuring instrument is a device used for detecting straightness dimensions. Different instruments vary in terms of the applications they are used for, their functions, and the measurement capabilities they offer. It’s a brief introduction to how to choose the right measuring instrument. Determine the measurement location. For square bars, square tubes, round rods, etc., it goes without saying that the straightness of their outer surfaces is what is measured. However, for steel tube products, not only is the straightness of the surface measured, but also the straightness of the inner surface; therefore, it is necessary to clarify which part’s straightness is to be measured. A straightness measuring instrument for long tubes is a system that utilizes the linear properties of lasers, as well as the ability of laser position-sensitive sensors to accurately determine the location of the energy center, in order to detect the straightness of the internal bore. A straightness measuring instrument is a device that uses the straight-line method for measurement. It consists of a straightness measuring system made up of 3 instruments: the two instruments at the front and back fit together to form a straight line, while the instrument in the middle compares this line with the desired straightness standard, thereby providing information on the degree of straightness. Each instrument employs photoelectric measurement principles to carry out non-contact, online or offline detection. Measurement method: When conducting measurements, it is necessary to determine whether online or offline detection is required. The inner hole straightness tester can only be used for offline detection, while the straightness meter can be employed for online dimension measurement. If offline detection is needed, a frame can also be constructed to move the straightness meter or the pipe along guide rails, thereby enabling offline dimension measurement. In short, a straightness measuring instrument is more suitable for use on production lines; it can be installed either before or after the straightening machine, or at any other location where straightness measurement is required. For the basic information of rolled products, an appropriate measuring instrument must be selected based on the range of those products. If the range of the rolled products exceeds the measuring range, no data can be obtained; whereas if it is much smaller than the measuring range, it leads to increased costs. Therefore, it is important to choose a measuring instrument with an appropriate range. For the inspection of straightness dimensions, various factors such as the outer diameter range, length range, measurement accuracy, and the spacing between measuring instruments need to be considered. Operating conditions on-site: This is a factor that needs to be taken into account for online straightness measuring instruments. Such instruments are installed directly on the production line and are optical detection devices; therefore, the external environment has a significant impact on them. When the operating conditions are good, there is no need to install cooling or dust-proof equipment, but when the conditions are poor, a cooling and dust-proof system must be installed depending on the actual situation. Technical specifications of the online straightness measuring instrument: 1. Range of rod diameters that can be measured (mm): 50–140 ； 2. Straightness measurement accuracy (mm): ≤±0.5 ； 3. Measurement frequency (Hz): 500 ； 4. Required ambient temperature (°C): -20～50 ； 5. Required environmental humidity (%RH): 85 (no condensation) ； In fact, straightness measuring instruments can be customized according to specific requirements; therefore, by informing the manufacturer of the object to be measured and the testing needs, an appropriate measuring instrument can be designed to meet those requirements, eliminating the need for one to go through the hassle of making a selection themselves. Baoding Lanpeng Measurement and Control Technology Co., Ltd. Reference article: Lanpeng Measurement and Control – measurement and control software. You can leave me an online message to inquire about prices or provide your contact details; I will get in touch with you once I see it.