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Casting the screw is in the following order.
The model propeller is installed in the investment ring and set it on a flat board or sheet steel.
As the molding sand in the casting of the propeller of silumin, whose melting point is low, can be used for virtually any sand. It is best suitable for this purpose, silica - soft soil is dark brown. The land must be carefully sifted, purged of impurities, primarily from the roots. To get good gas conductivity of the mixture and clean the casting from the sand through a sieve with a cell about me mm to remove particles too large, then too small - on a sieve with a cell 0, 3-0, 55 mm. Dry sand is mixed with 3-5% water glass. The mixture is then carefully rubbed his hands to obtain a homogeneous composition. Investment ring stuffed with ground to about the upper edges of the blade, so to get the impression the bottom of the model. Tamped the earth around the model, and then carefully wipe out a trowel. The resulting surface (the plane of the connector) coated with a thin layer of graphite, talc or simply crushed charcoal. Excess powder blow off. Then put into place and fill the earth upper mold. The diameter of the hole for pouring the metal should be slightly larger than the diameter hub. This allowance provides a good density of the casting, as shown in the piping profit, which later, with machined screws, cut off. Prior to the investment ring hollow model pierce in several places in wire to an outlet for gases formed during casting.
Silumin can melt any metal vessel, it is important only to its walls were thick enough and kept the temperature of molten metal required time. Melt overheating silumin better - to improve his strength. Eye on the readiness of the metal can be determined with stirring: It must not adhere to the metal mixer. Before pouring the metal into a form that is necessary to remove the formed on the surface of the slag.

The finished casting after demolding subjected hardening. You can replace, for simplicity, natural aging hardening, which is what a hot piece left in the air for 6 days. Next, make the machining of step-gon and the balance of the propeller.