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Laurell Technologies WS-400 spin coater used to apply photoresist to the surface of a silicon wafer. Spin coating is a procedure used to deposit uniform thin films onto flat substrates. Usually a small amount of coating material in liquid form is applied on the center of the substrate, which is either spinning at low speed or not spinning at all.
Spin casting is a favored method for fabricating items in the specified materials – low temperature metals and thermoset plastics. Compared to the two main competing processes, injection molding and (zinc) die-casting, spin casting has significant advantages in terms of startup cost and ease of use.
There are four basic parameters that are involved in spin coating: solution viscosity, solid content (density), angular speed, and spin time. [13] A range of thicknesses can be achieved by spin coating. Most commonly the thicknesses range from 1-200 μm. The main properties that affect the thickness of the film are viscosity and spin speed.
BBS produces wheels for motorsport, OEM, and aftermarket applications. The company is often credited as pioneering the three-piece wheel and advancing the aluminum wheel industry over many decades, and remains one of the largest producers of automobile wheels in the world. [1] It is a part of KW Automotive since 2021.
Custom wheels for lowriders also used naked ladies on wheel covers, and these were the first to feature a floating or spinner-type wheel device. A bracket was used to mount to the spindle, so while the lady stood still the wheel spun around. [ 17 ]
Wheels can also lose traction when surface conditions reduce available traction such as on snow and ice. As an open differential delivers only enough torque to cause the "weakest" wheel to spin, if one drive wheel is stationary on a low traction surface (mud, ice, etc.), the deliverable torque is limited to the traction available on it.
The PlasmaCar design includes six wheels, but only four touch the ground. The first two wheels located at the front of the vehicle do not touch the ground (a common misconception) or spin: they are merely there for stability and safety in case the rider leans forward or drives into an elevated surface (such as a street curb).
With the larger alloy wheels came Tru-Spinner Wheels and spinner wheel add-on spinners that would free-spin and continue to free-spin after the alloy wheel itself came to rest. American inventor James JD Gragg of International and American Tru-Spinners were the original ones and were leaders in the industry.