Model crane 3 axis working servo motor Arduino controlled UPDATE

UPDATE 9 December 2019 Arduino Software update Docks4.ino.ino. This software also controls a circuit for floodlights (use a driver such as a Mosfet or relay) and a level crossing servo motor.and 2 sensors which control them. Grounding Sensor 2 triggers the gates and the lights. Grounding sensor 1 will switch off lights and close gates if sensor 2 has not been grounded for 30 seconds* and the crane is in the Park position. *can be set in software. All these can be omitted but there will be a 20 second delay on startup. ensure sensor 2 pin is grounded and sensor pin 1 is held at +5v ( see comments in software)
Suggestion: after much trial and error the best "rope" is the sheath 'tear' or 'rip' string found in UK telephone / alarm multicore cable. Very strong flexible and light

This is a lineside crane servo operated and arduino controlled. the crane will pan 180 degrees, the boom will raise and lower and he magnetic "hook" will raise and lower about 150mm. All files for printing, assembly and arduino are included. The crane is magnet pickup (fixed not electromagnet) the magnet ball needs to weigh around 25g (I used 4 x 4mm nuts and a 5mm rare earth magnet. 2 prints of parts that have filenames ending in "2" are required. Most of the model is hidden under the table.
The main gears visible above the table are just for show. the handles will turn when the crane moves. the control box has 8 buttons for user set positions, and 3 knobs and 1 switch for setting these positions or manual control. User instructions are in the crane2.ino arduino sketch. I used a mini and I have included the .stl for the electronics box. I built the circuit with veroboard but I have no drawings of this. The circuit is simple and included in the INO and pdf file. Please message me if you have any questions. I will try to get back to you within a few days.

Materials.
Your plastic of choice. I used ABS.
1 Arduino Uno (or arduino of choice (I used a pro mini (with FDTI programmer). Uno is larger but easier.)
3x 10K linear (B) potentiometers
8 push to make switches
1 mini toggle switch
1 LED and 100 ohm resistor
5V power supply
Hook-up wire.
String (I used builders chalk line from a builder's merchant (Travis Perkins) £2.50 for 50 metres.
Wire (I used straightened paper clips) about 0.8mm diameter
Small screws (the ones that come with the servo horns are fine)

Print the parts.
Cut a servo horn to fit inside the recess in the servo pan gear. No need to glue it. Assemble the horn into the servo and screw the servo to the fixed base.ensuring the gear is free to turn.
Glue the main pan gear to the top side of the rotating base so that the main hole aligns with the gear spigot.
The spigot will pass through the hole in the fixed base and the gears should mesh. Don't do this yet.
screw the servos to the servo base.
use wire to form axles for two small pulleys
I also added wire string guides to help string stay on the pulleys
screw large pulleys to servo.
Superglue the 2 boom sides together so that they curve symmetrically
fit the top pulley and glue the cowl
see illustration for wire bending for the 2 cowl ties, the pulley block and the mini pulley axles.