Just an update on my challenge crane.
First the winch for the lifting hook cable.
This was assembled on a sub-base. The power is from a micro-motor and gearhead driving a lay shaft via a set of bevel gears with a couple of spur gears driving the drum shaft. The drum shaft runs in 2mm eyelets (not sure where THEY came from. Wish I could find some more). The side frames were cut from 1.5mm plastic sheet and because it would be impossible later everything was given a coat of paint before assembly.
The finished winch stuck firmly to the crane base.
The next bit was the jib. I wanted a moving jib with an open lattice type construction so a quick raid on the plastic rod/shapes box found some suitable I and angle beams and a pleasant afternoon was spent producing the following:
and bottom view....
Looking at the pictures I wonder if I should add more angles to the top of the jib
As I like the 'enclosed' style of crane the next part of the construction is the cabin.
The sides are 1mm aircraft ply (expensive to buy but a little goes a long way). The windows are framed with Northeastern scale lumber with the cross frames done in the same material.
The cabin itself is only 5 scale feet high to keep the proportions looking sort of right which means that I will have to find a -small- operator to fit inside.
Caution this next bit contains electro techno babble.......
I have also been experimenting with the DCC decoder which will control the whole thing. I have, I think, got the final circuit Gnutted out. The crane will be able to swivel through 360 degrees in either direction using the loco speed controls. The jib and hook winches will be controlled by functions 1, 2 & 3. F1 selecting which winch is to be controlled and F2 & F3 used to wind up and down. There will be a 'strobe' light on the roof to comply with 'H & S regulations' and its rate of flash will indicate to the operator which winch is active. There will also be a work light on the front of the cabin that will, of course, work.
This was all done with 1 decoder (Digitrax DH163) 5 resistors, 4 zener diodes and a relay (in a pear tree !).
One problem that I cannot see an answer to, is how to motorise the outriggers. There just isn't enough room in the chassis to mount the motors and gear boxes
I might just take the lazy way out and leave them off.
The next part of the project is to build the jib winch (the required motor with gearhead arrived on christmas eve) and assemble the cabin.