Parallel with the previously described I built the frames of the 12 main crawler units, largely out of 2mm gauge plate because of the huge load that will eventually rest on them. The 3 bridge-like support structures which pivot on the underside of the toroidal core via the 20mm high-tensile bolts (which go into the 3 fin-like appendages to the core - described earlier) were also constructed. These support structures are immensely strong, each consisting of 8 adjoined closed boxes made entirely from 2mm plates. Each must support about 350 kgs.
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| Twelve crawler frames plus supporting structures |
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| Four crawler frames with supporting structure |
Steering tillers can be seen in the top picture. These will be attached to motor-driven ram units to effect steering of the machine.
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