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Ideal test indicator pushed. Prior to modern geared dial mechanisms, test indicators using a single lever or systems of levers were common. The range and precision of these devices were generally inferior to modern dial type units, with a range of 10/1000 inch to 30/1000 inch, and precision of 1/1000 inch being typical.
A flatness test of a float-glass optical window. By placing a ruler across the image, adjacent to a fringe, and counting how many fringes cross it, the flatness of the surface can be measured along any line. The window has a flatness of 4–6λ (~2100–3100 nm) per inch. An optical flat test in both green and red.
The lower image is a plain plug gauge used to check the size of a hole; the green end is the go, and the red end is the no-go. The tolerance of the part that this gauge checks is 0.30 mm, where the lower size of the hole is 12.60 mm and the upper size is 12.90 mm, every size outside this range is out of tolerance .
There is a formal test to measure wringability. First, the block is prepared for wringing using the standard process. The block is then slid across a 2 in (51 mm) reference grade (1 μin (0.025 μm) flatness) quartz optical flat while applying moderate pressure. Then, the bottom of the gauge block is observed (through the optical flat) for oil ...
In metrology and the fields that it serves (such as manufacturing, machining, and engineering), total indicator reading (TIR), also known by the newer name full indicator movement (FIM), is the difference between the maximum and minimum measurements, that is, readings of an indicator, on the planar, cylindrical, or contoured surface of a part ...
A post shared on social media purportedly shows a video of a truck full of bodies recently found in Mexico. Screenshot from X Verdict: False The video is from 2018. Fact Check: Mexican Drug ...
The video was originally posted on YouTube on Dec. 4 and does not show people firing at the drone. The FBI has warned against attempting to down the mysterious drones, according to Fox News .
A coordinate-measuring machine (CMM) is a device that measures the geometry of physical objects by sensing discrete points on the surface of the object with a probe. Various types of probes are used in CMMs, the most common being mechanical and laser sensors, though optical and white light sensors do exist.