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Most Baoding balls consist of a pair of hollow spheres, each containing a chime that rings when an inner ball strikes the outer sphere. Many modern examples are decorated with cloisonné and brass wire; these are essentially decorative since they easily chip when dropped or rubbed together. Baoding balls can also be made of solid jade, agate ...
Behind the finished vase are the spinning tools used to shape the metal. Metal spinning, also known as spin forming or spinning or metal turning most commonly, is a metalworking process by which a disc or tube of metal is rotated at high speed and formed into an axially symmetric part. [1] Spinning can be performed by hand or by a CNC lathe.
Typical components produced by metal spinning are lamp bases, reflectors, hollowware (pitchers, tankards, vases, candlesticks, etc.), pots, bans bowls and components for electrical equipment. [1] Design for manufacturability (also sometimes known as design for manufacturing or DFM) is the general engineering art of designing products in such a ...
In a demonstration, a metal sphere dropped on amorphous steel bounced significantly longer than the same metal sphere dropped on crystalline steel. [ 4 ] The lack of grain boundaries in a metallic glass eliminates grain-boundary corrosion—a common problem in high-strength alloys produced by precipitation hardening and sensitized stainless steels.
ForeverSpin is a Canadian company that manufactures metal spinning tops, which have a similar appearance to the top seen in the 2010 film Inception. [3] The company funded the initial manufacture of its tops through crowdfunding campaigns. [4] [better source needed] [5] [better source needed]
The Betz mystery sphere is a metal sphere with an approximate diameter of 8 inches (20 cm) weighing nearly 22 pounds (10 kg) uncovered in 1974 by a family in Florida. [ 1 ] [ a ] Background
This sphere example was used by Newton himself to discuss the detection of rotation relative to absolute space. [8] Checking the fictitious force needed to account for the tension in the string is one way for an observer to decide whether or not they are rotating – if the fictitious force is zero, they are not rotating. [9]
A yard globe (also known as a garden globe, gazing ball or chrome ball) is a mirrored sphere displayed as a lawn ornament, typically atop a conical ceramic or wrought iron stand. Sizes ranges from 1 in (25 mm) up to 10 m (33 ft) in diameter, with the most popular gazing ball being 12 in (300 mm).
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