Major defects must be reported to authorized repair facilities. Determine the category if the defects can be repaired. Calibration Evaluation Result/Findings.ġ.11 Record the result on the prepared datasheet. Table form of a list of Calibration Check Points and Measurement Points as well as the blank portion for the recording of actual results. Temperature (Before, After and necessary Time intervals During calibration) Time of Inspection may also be included if necessary Actual Calibration Date indicating Start Date and Finish Dateĭ. Important content of the calibration datasheet basically includes the following:Ĭ. The sliding motion of the blades shall be smooth.ġ.9 The protractor must not be contaminated with excessive oil, dirt, or dust.ġ.10 Prepare a Calibration Data Sheet. Move the blade from side to side when unclamped. There must be no movement or rocking between the blade and the surface plate or toolmaker’s flat.ġ.8 Examine the blade clamps and locks operation. Place the working edges and blade on a surface plate or any toolmaker’s flat.
Burrs, deformation, and warpage are also not allowed.ġ.6 For digital bevel protractors, the readings on the LCD must be clear and visible.ġ.7 Perform preliminary flatness and parallelism checks on the working edges and blades of the protractor.
Digital protractor free#
For micro protractors, the graduations on the thimble and sleeve must also be checked properly.ġ.3 Check the knobs, and locking nuts are functioning well.ġ.4 On the magnifying lens of the vernier scale, there shouldn’t be any noticeable scratches that might obscure the scale.ġ.5 The blades, and working edges, must be free from rust.
In this stage, conduct a visual inspection of the bevel protractor.ġ.1 All parts of the protractor must be complete.ġ.2 Scales and graduations must be visible, including the vernier scale and main scales. Preliminary Inspection of the Bevel Protractor Measuring tools and equipments to prepare for this bevel protractor calibration are: So, if you want to learn further, you can read the standard entirely. The process of calibrating protractors discussed below is based on the standard requirements of bevel protractors stated in the BS 1685:2008 standard, entitled “Bevel Protractors (Mechanical and Optical) – Requirements and Test Methods”. The analog version employs a vernier scale. This model is available in analog and digital version. It measures down to 5 minute resolution (the smallest reading). Bevel Protractor Calibrationīevel protractor or vernier protractor or micro protractor or universal bevel protractor is the most precision model of protractor.
Digital protractor iso#
International standard such as ISO 9001 and ISO 17025 which covers general calibration requirements define personnel or lab who can conduct calibration. In this article, we are covering only the bevel vernier protractor and the double arm protractor models, because these two models are frequently used for a considerable accuracy.īut still, it is advisable that an accredited/certified calibration lab shall conduct that protractor calibration, like any measuring device. That said, the way to calibrate for each type is also different. There are different types of protractors (half-circle, single-arm, double-arm, vernier model, etc). This article will provide a basic idea of the techniques for calibrating protractors conducted by certified calibration laboratories as well as a simple guide and idea of protractor calibration beneficial for people who use their protractors for hobbies, interests, and small businesses and workshops.
Digital protractor how to#
How to know that your protractor is accurate? What is the way to assess that your protractor’s accuracy is still within the permissible accuracy (tolerance)? What if your protractor actually needs a replacement? All of these questions can be answered with a protractor calibration.
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