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The tar helps fill any remaining gaps in the cuntlines as well as creating a waterproof seal over the line within. As with worming, parcelling is applied in the same direction as the twist of the line being covered. The rule is "worm and parcel with the lay; turn and serve the other way".
There are a few common methods for filling the mold cavity: gravity, low-pressure, high-pressure, and vacuum. [29] Vacuum filling, also known as counter-gravity filling, is more metal efficient than gravity pouring because less material solidifies in the gating system. Gravity pouring only has a 15 to 50% metal yield as compared to 60 to 95% ...
Spinning tools can be made of hardened steel for use with aluminum, or from solid brass for spinning stainless steel or mild steel. Some metal spinning tools are allowed to spin on bearings during the forming process. This reduces friction and heating of the tool, extending tool life and improving surface finish.
In one process, the wax is poured into the mould and swished around until an even coating, usually about 3 mm (0.12 in) thick, covers the inner surface of the mould. This is repeated until the desired pattern thickness is reached. Another method involves filling the entire mould with molten wax and letting it cool as a solid object.
A standard Hollywood movie averages about five 2,000-foot reels in length. The "reel" was established as a standard measurement because of considerations in printing motion picture film at a film laboratory, for shipping (especially the film case sizes) and for the size of the physical film magazine attached to the motion picture projector.
This typically results in incomplete filling of the mold as well as a rough, porous finish, called orange peel. Zamak 2, of a slightly different composition, was originally developed as a gravity-cast alloy with greater finished strength but was found to work well with spin-casting.
A high-purity (≥99.9998%) aluminium bar that has been etched to reveal the component crystallites. Chemical milling or industrial etching is the subtractive manufacturing process of using baths of temperature-regulated etching chemicals to remove material to create an object with the desired shape.
Spinning reels also tend to have more issues with twisting of the fishing line. Line twist in spinning reels can occur from the spin of an attached lure, the action of the wire bail against the line when engaged by the crank handle, or even retrieval of line that is under load (spinning reel users normally pump the rod up and down, then ...
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