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2. Sandpaper - Wikipedia

   en.wikipedia.org/wiki/Sandpaper

   Examples of sanding discs using a quick-change mounting system. A quick-change system is commonly used with disc-type coated abrasives. A plastic or metal hub is bonded to one of the faces, which is threaded. This then mates directly to the sander or angle grinder or to a mandrel that can be mounted in a sander, grinder, or drill. The advantage ...

3. Stefan adhesion - Wikipedia

   en.wikipedia.org/wiki/Stefan_Adhesion

   Stefan adhesion is the normal stress (force per unit area) acting between two discs when their separation is attempted. Stefan's law governs the flow of a viscous fluid between the solid parallel plates and thus the forces acting when the plates are approximated or separated.

4. Disc cutter - Wikipedia

   en.wikipedia.org/wiki/Disc_cutter

   Some discs used for cutting ceramic tile or stone are made from a solid disc with an edge coated with diamond grit. The most common size for these cutting wheels is 4 + 1 ⁄ 2 inches in diameter; however they can range from 2 to 16 inches in diameter with a thickness range from .045 in. to .125 in. Type 1 discs are flat, and type 27 discs have ...

5. Disc brake - Wikipedia

   en.wikipedia.org/wiki/Disc_brake

   On automobiles, disc brakes are often located within the wheel A drilled motorcycle brake disc. The development of disc-type brakes began in England in the 1890s. In 1902, the Lanchester Motor Company designed brakes that looked and operated similarly to a modern disc-brake system even though the disc was thin and a cable activated the brake pad. [4]

6. Laser engraving - Wikipedia

   en.wikipedia.org/wiki/Laser_engraving

   Laser engraving is the process of selectively removing microscopic layers of material, thus creating visible marks on the treated surface. Depending on the materials, the laser-material interactions can be different.

7. Magnetic-tape data storage - Wikipedia

   en.wikipedia.org/wiki/Magnetic-tape_data_storage

   Magnetic-tape data storage is a system for storing digital information on magnetic tape using digital recording.. Tape was an important medium for primary data storage in early computers, typically using large open reels of 7-track, later 9-track tape.