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2. Schiffli embroidery machine - Wikipedia

   en.wikipedia.org/wiki/Schiffli_embroidery_machine

   The conversion of the design into a punch card was known as punching. Card reader fully automated schiffli embroidery machine by Saurer. Needle spacing, or pitch, limited the width of the embroidered design. The spacing between the needles is known as rapport. The unit for measuring spacing was the French inch (1.08 English inch).

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.

4. Corrugated box design - Wikipedia

   en.wikipedia.org/wiki/Corrugated_box_design

   Small (nominally 1 ⁄ 2 inch crown) staples can be applied to a box with a post stapler. Wider crown (nominally 1 + 1 ⁄ 4 inch) staples can be applied with a blind clincher; Box sealing tape, pressure-sensitive-tapes are available in various widths i.e. 36, 48, and 72 mm widths and several thicknesses. BOPP and PET are used as a backing.

5. Turret punch - Wikipedia

   en.wikipedia.org/wiki/Turret_punch

   A turret punch or turret press is a type of punch press used for metal forming by punching. Punching, and press work in general, is a process well suited to mass production. However the initial tooling costs, of both the machine and the job-specific press tool, are high. This limits punch work from being used for much small-volume and prototype ...

6. Deep hole drilling - Wikipedia

   en.wikipedia.org/wiki/Deep_hole_drilling

   Important for the good surface quality is the asymmetrical design of the deep hole drilling tools. The "classical" tools for single-lip deep hole drilling, BTA deep hole drilling and ejector deep hole drilling are, with a few exceptions, designed asymmetrically and have a secondary cutting edge (circular grinding chamfer) and guide pads.

7. Inch - Wikipedia

   en.wikipedia.org/wiki/Inch

   Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as ⁠2 + 3 / 8 ⁠ ″ and not as 2.375″ nor as ⁠2 + 6 / 16 ⁠ ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been ...