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Chassis from top, showing lower turntable thrust bearing loaded with
Meccano ball bearings. Lower half of upper turntable rings in place
awaiting insertion of superstructure end of turntable. |
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45 degree angle plating gives added chassis twist prevention
strength. This chassis is not designed to allow for any twist, to enable
any of the stabilizer arms to be able to lift the entire crane safely. |
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Rearmost 45 degree plating and rear axle mount. |
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Underneath showing central 45 degree plating area and criss-cross
supports under central outrigger box mounts. |
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Showing how the rear axle mounts.. |
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At the back of the gearbox opening, some additional 'anti-twist'
strength. |
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The thrust bearing in more detail, from a slight angle. |
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Thrust bearing from top. This bearing is designed to take the entire
weight of the superstructure - expected to be ~ 100lb. |
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What gives the strength.... a lot of Meccano! Also shows the
adjustable compensation arm system to fine-tilt the thrust bearing vs
the upper bearing. Needed when one has 2 sets of parallel ball bearing
turntables held tightly together. |
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Turntable assembly from the underneath. |
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Upper part of the turntable - the mount for the superstructure. The
wheel flange is the top part of the thrust bearing. Also visible is the
12V power supply ring, to get power from the superstructure batteries
(probably in the counterweights) down to the truck. |
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Side view, showing the radial placement of stacks of strips to
control the upper turntable's precision. There are a little of 300
strips used to do this.... |
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With the wheel flange lifted up, to reveal the circuit ground
connect to the wheel flange - a contact arm will touch the outside ring
section of this wheel flange, to ensure electrical continuity from
superstructure to chassis. |
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Upper turntable viewed from the side showing Meccano ball bearings
in place, as well as the dual Exacto 7.5" toothed rings to enable the
superstructure to swing itself around with a direct drive. |
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