Mobile Crane
Built by Brian Elvidge in July 2021
This model features three motions — slew, luffing the jib, and hoisting the load. It is driven by a Como Drills RS540 motor to gearing as shown in the photos.
The jib is almost 2’ 6” long, and is made from girders, extended by 12½” strips and braced girders. The tower is 9½” high and 7½” square, built using girders, plates and braced girders.
Slewing is carried out by a 4” ball race and 133-tooth gear, driven by a 19-tooth pinion from the mechanism.
The load is hoisted by a single row block; a double row can be substituted easily (see general view).
At the present time the model does not travel. This is planned in the second phase of development.
December 2021
The model shown in the later photos is a development of the earlier crane. It now has four motions — slewing, luffing, travel and hoisting — powered by a Dave Taylor type RS 540 motor.
The underside view of the gantry shows how the power is distributed to two of the bogies. The other photos show how the mechanics are arranged on the superstructure.