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Miniature of da Vinci's siege catapult Updated 11/11/15.
The overall dimensions are as follows: 18" in length by 16" in width by 6" in height. It features a few details.
A. As seen from underneath the machine, the worm gear, which is activated by the windlass cranks on either side of the machine, is fabricated as one piece on the bandsaw. By angling the table to 25 degrees and installing a fence 1/4" before the blade reaches the center of the dowelstock, and turning the piece against the pull of the blade, one can guide the gear along the cut and make an impressive worm. WARNING It requires skill, nerves and a healthy desire to live to attempt this.
B. The worm activates a sprocket, as seen in A. The sprocket is attached directly to an iron screw 10" in length which, when turned, causes the firing mechanism to travel either up or down the length of the screw. The firing assembly consists of 2 sub-assemblies. The front piece holds the bolt to center, and the rearward piece releases the front piece when the metal rod, protruding from the top, is struck by the operator. If you zoom into C., Leonardo explains the trigger.
D. The block and tackle are missing from daVinci's design which leads me to agree that this machine was probably never built. Range cannot be calculated from safety without some kind of elevation system. This block and tackle idea is such a simple solution that it probably would have been used if one of these machines was ever realized. The ramming head on the bolt would have made more sense for busting down fortifications than the arrow used on the original plan and by Ray Harryhausen on the Seventh Voyage of Sinbad©. FLASH! This just in! Apparently the latest research proclaims that the correct ammunition for the siege cat would have to be a rock, and that the arrow was probably an artistic way of showing off to the prospective buyer. Good for them.
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