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Cape Canaveral Reef Project part 1
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In the manufacture of welded screws machined to exact size of the hub and set it at a walking pa hill aft end down. Markings on the blade contour on a hill walking cut from construction paper pattern blade, moving it to control risks. The root of the pattern is cut on the surface of the hub. Then imposing a pattern on a sheet of metal (thickness of 1 - 2 mm larger than the thickness of the blade root section), transferred its outline and cut out the desired number of blades. The contour is given the allowance of 2-3 mm. To reduce the workload on the filing of the blade cross-sectional profile and to facilitate bending the blades, blanks is recommended to treat pa milling machine. At the same time in finishing the surface of the allowance should be left on the thickness of 2 mm and the edge piece to leave a minimum thickness of 3 mm.
Holding the blade near the root of the work piece in a vise, bend it to give a helical surface, striking 300-500-gram hammer, the opposite side of the work piece support with a hammer weighing 3-4 kg with a narrow rounded tip. The blade must bend in the area between the support and the place blows, but not at the root of the blade. Thick (10-12 mm), heating the billet with a blowtorch. Control of bending is carried out by applying a piece on hill walking. Partition on the side of the blade engulfing lines of step angles; proceed to the surface profiling, cross-sectional patterns and measurement of individual points in accordance with the drawing. When the blades are processed, and their root-section fitted to the hub, begin to weld the screw.
One of the blades are placed on the steps of the hill, combining with the edge of the risk involved in rectangles, and two small tack welded to the hub. After verifying the accuracy of the blade, making pot holders on the opposite side of the blade. Finally welded to the blade by placing short stitches alternately a small leg up on both sides of the metal cladding of a sufficient number to form a smooth transition from the surface of the blade to the hub,
Weld the blade, hub rotated so To the surface of the blade fell on one of the additional step polygons on Yuri. This position is fixed hub, put on a hill next blade, grab it, and then welded to the hub.
After welding, all the blades density test their fit to the step-gon, if necessary, bends, cut the diameter of the screw, Treated with compound blades to the hub and bore a hole under the propeller shaft
Next, the static balancing machine screws on the parallel and horizontal knives. The screw is set at odds. Metal with a heavier blade, which is at the bottom is removed closer to the edge of the blade and approximately vertically to the axis of the shaft. As a result of balancing the propeller must not spontaneously turn to knives, and should begin to rotate under the influence of weights weighing 2 g (screw diameter of 200-300 mm), fixed with plasticine to the edge of any blade. |
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