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Crawler Crane Boom Structures
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The boom, jib, and superlift are all truss structures. See my
TRUSS
page to learn about what that means. On a real crane, this type of structure is the "lattice boom".
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This is a close-up shot of the boom on the crawler crane. The main vertical members are 1x16 black Technic beams. The "lattice" part (the diagonals) are 1x12 Technic beams in one plane. In the other plane (perpendicular to the one with 1x12 beams), string is tied tightly in an X pattern to make the lattice.
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This is the base of the boom. There are two winches located here for the jib hoist line and jib holdback line. They are driven by two
non-geared 9 volt motors.
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This is the top of the boom where the jib connects. The upper block of the main line is located here. There are 10 sheaves (10 small Technic pulleys) for the 20-part main hook.
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This is a better shot of the upper part of the main block. I bored out the pulleys so that they could be spaced by a 1/2 width beam (a liftarm) and still rotate freely (they are all on one axle).
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This is the top of the jib (about 12 feet above ground).
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The whole jib, a little over 4-feet long.
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This is the top of the superlift showing the main boom holdback line. The line is parted 13 times and one of the blocks is attached to the top of the superlift.
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