First, we install the right-angle axles on the four corners of the small box
When installing the right-angle axle, it should be buckled from the bottom of the base
Then install four pulleys on the right angle axle
The right-angle axle will break when the right-angle axle is pressed outward
When the right-angle axle is facing down, press against the base

Insert the green bushing into the third hole of the short post
Fix the large and small gears on the other two short vertical
Install the handlebars on the black shaft pins separately
Install the two with the large and small gears in. Inside the fourth hole at the rear of the frame base
The sleeve has a short post inserted into the fifth hole

Use another green bushing to fit into the first hole of the red long post
Use the yellow small shaft to pass through the three green shaft sleeves, and the long column passes through the middle
Take out the cotton thread, cut two pieces of the same length, about 60cm long
Rotate the short column of the big and small gears to the front
Thread the two wires around the gap of the black double-shaft pin, tie a knot and wrap it a few times.
After tying the cotton thread, turn it inside
Install the square block on top of the four short uprights
The two grain wish lines pass through the square quick holes respectively
Turn the crank handle to collect the cotton thread
One of the cotton threads is fixed on the long column hole with a flat buckle
Install the small pulley on the right angle axle, install the pulley on the pulley hook
Another cotton thread is passed through the moving pulley paper, and then fixed on the long column

The original fulcrum, force application point, and resistance point can all be displayed on the circular motion
Look at the first round first, the fulcrum is in the middle, the force application point and the resistance point are on the left and right
It's called a fixed pulley

The fulcrum is in the middle, and it is more convenient to change the direction of force application. Only one-third of the force can easily lift the object
The other wheel is tied to the wheel above the hook, and this wheel becomes the resistance point tied to the middle
The fulcrum and the force application point are on both sides, and the force application arm is twice as long as the left
It can save half the effort, which is called the moving pulley

When the fixed pulley is combined with the movable pulley, it not only saves effort but also changes the direction of force application
It's my secret that this crane model is used for power.