Scratch and dig numbers
Webof the minimum size dig number specified. Scratch Length Diameter of Aperture DIG Scratch Length Diameter of Aperture When there is no maximum size scratch on the lens surface, the following formula applies: Scratch numbers are the apparent widths of hairline scratches allowed in units of 0.001mm. A scratch number of 80 is really 0.08mm wide. WebThe scratch number refers to the width of the reference scratch. See Standards Table above. Keep in mind that this equivalence is determined purely by visual comparison, and …
Scratch and dig numbers
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WebOct 13, 2004 · standard for specifying scratch-dig. I realise that the scratch number doesn't actually define the width of scratches (like many people beleive) but references the samples used for comparison. According to the drawing C7641866 L, released in 1980, the master samples have moved from Frankford Arsenal to ARRADCOM. Can you still Webterms “scratch” and “dig” are not related so each needs to be defined separately. SCRATCH A scratch is exactly that, an elongated mark on an optical surface. The actual number …
WebThe first is the scratch number and the second the dig number. The dig number is the diameter, measured in hundredths of a millimeter, of a circle which would enclose the … WebScratch-dig specifications of 40-20 are widely considered standard quality for many optical applications. Precision laser applications typically require a scratch-dig of 20-10, whereas …
WebAug 5, 2024 · You would need to choose an optical window that does not block light in this wavelength range and allows for proper transmission above 80%. Several candidates jump to the forefront such as Fused Silica (180-2,500nm), CaF2 (130nm-9.5μm) and NaCl (250-20μm) just on wavelength alone. WebA scratch-dig number of 40-40 or even 80-50 is appropriate for most optical windows, especially those used for imaging systems. Some precision applications may require 40-20. High power laser systems require high surface quality, perhaps 20-10 or 10-5. The lower the scratch-dig number, the higher the manufacturing cost, and there is a high cost ...
WebNov 26, 2006 · According to many, the scratch-dig ratio standard is largely a cosmetic standard for appearance of a surface, and an old standard at that. There are also investigations showing that a better scratch-dig ratio does not necessarily mean less scatter. So the plot thickens and the waters get murkier it seems.
Web12 rows · SCRATCH: Any marking or tearing of the glass surface. SLEEK SCRATCH: A hairline scratch. CRUSH ... health plan management group springfield moWebThe first number indicates the maximum width allowance for a scratch measured in microns, and the second number is the maximum diameter for a dig in hundredths of a millimeter. Thus, 60-40 means the apparent width … health plan insurance provider phone numberWebMay 8, 2014 · The dig number is the number mentioned second in the scratch/dig combo. For example, 50 would be the dig specification in 80/50. MIL spec. states that dig … good deals tucson az storeWebIn addition to the Scratch Dig markings, there is a 60mm scale, 6 grids varying in size and 6 blocks of lines with varying frequencies on each plate. ... Plate 1 includes grade numbers ranging from 0.004 to 0.040 while Plate 2 includes 0.040 to 0.400. The first surface sets have the features marked on the top of the glass substrate. The second ... health plan massage harrisonburgWebDec 6, 2013 · The first number indicates the maximum width allowance for a scratch measured in microns, and the second number is the maximum diameter for a dig in hundredths of a millimeter. Thus, 60-40 means the apparent width of the scratch is 60 microns and the diameter of permissible dig is 0.4 mm. health plan management system loginWebNumber Line. A number line can be used to represent integers and the values in between them. The following image depicts a number line: Blocks. Many blocks take a number … good deals website post a reviewWebThe scratch-dig requirement for a 120-mm-diameter surface is 80-50, and two scratches are found with the maximum size (80). One is 12 mm long, and the other is 17 mm. The combined length of the two scratches is 29 mm, and … good deals washer and dryer