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2. Surface plate - Wikipedia

   en.wikipedia.org/wiki/Surface_plate

   A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. [1] The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat with tolerances below 11.5 μm or 0.0115 mm per ...

3. Spirit level - Wikipedia

   en.wikipedia.org/wiki/Spirit_level

   For a precision machinist level with 2 mm (0.079 in) divisions, when the vial is tilted one division, the level will change 0.04 mm (0.0016 in) one meter from the pivot point, referred to by machinists as 5 tenths per foot.

4. Flatness (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Flatness_(manufacturing)

   Sir Joseph Whitworth popularized the first practical method of making accurate flat surfaces during the 1830s, [2] using engineer's blue and scraping techniques on three trial surfaces, in what is known as Whitworth's three plates method. [3] By testing all three in pairs against each other, it is ensured that the surfaces become flat.

5. Optical flat - Wikipedia

   en.wikipedia.org/wiki/Optical_flat

   At 2 inches (5.1 cm) in diameter and 0.5 inches (13 mm) thick, both surfaces are flat to within 1/10 of the wavelength of the light (58.9 nm), as indicated by the perfectly straight fringes. An optical flat is an optical -grade piece of glass lapped and polished to be extremely flat on one or both sides, usually within a few tens of nanometres ...

6. Surface grinding - Wikipedia

   en.wikipedia.org/wiki/Surface_grinding

   Surface grinding is done on flat surfaces to produce a smooth finish.. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or nonmetallic substance from a workpiece, making a face of it flat or smooth.

7. AOL Mail

   mail.aol.com/?icid=aol.com-nav

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. 5 Essential Exercises for a Body Recomposition Program - AOL

   www.aol.com/5-essential-exercises-body-re...

   To level-up your row, Samuel suggests rounding your upper back (or thoracic spine) to better stretch the back muscles through a longer range of motion. FOURTH EXERCISE: Flat Dumbbell Press

9. Everything Level-5 Announced In Its Vision II Livestream - AOL

   www.aol.com/everything-level-5-announced-vision...

   Level-5 Vision 2024 – April 2024. Finally, Level-5 announced another livestream, called Level-5 Vision 2024. This one is subtitled “To The World’s Children,” and will take place in April 2024.