Alvaro's Scaling ladder

I wanted you to know how the 1st of ESO B students managed to make technology works in Colegio Zuloaga. We have built so far 3 of 10 machines invented by Da Vinci. They are not too complex mechanisms (as it seems to me), made by plastic parts. In this third blog, I'll show you the technological fundamentals of the saling ladder.

Well... We didn't finish the scaling ladder, that tells you everything about how we did. I'll go through the technological fundamentals of this construction.


Forces:

5 types of forces

-Compression force; the pillar that holds the ladder is subjected to this force.
-Sheed; the pieces when snapping.
-Bending; any elongated part fastened by both ends.
-Obviously stress force; nearly all the pieces subjected to some kind of force.

It is also a shell, fixed structure with fixed-end and simply supported beams.

The catapult is a mechanism that uses:
-A crank.
-A gear; a wheel with teeth along its perimeter.
-A worm gear; it rotates the crank.
-A connecting rod sytem; conected to the crank and to the gear.

Alvaro's Crane

The finished crane

I wanted you to know how the 1st of ESO B students managed to make technology works in Colegio Zuloaga. We have built so far 3 of 10 machines invented by Da Vinci. They are not too complex mechanisms (as it seems to me), made by plastic parts. In this second blog, I'll explain how we made the crane.

The crane was our first construction, so we found it very difficult, especially because we didn’t have any previous experience or any idea about how it was done. This was the reason that we strictly follow the instructions and although we were slow, we did very well done.
In this project I had a problem with my group, so I was changed to another. Despite those little incidents, we didn’t have more problems.
As I said in the catapult blog, our teacher helped us a lot with their explanations.

Forces:

5 types of forces

-Tension; the rope is subjected to this force.
-Compression force; the pillar that holds the crane is subjected to this force.
-Sheed; the pieces when snapping.
-Bending; any elongated part fastened by both ends.
-Obviously stress force; nearly all the pieces subjected to some kind of force.


It is nearly the same type of structure than the catapult: It is a shell, fixed structure with fixed-end and simply supported beams. It has pillars and columns.

The catapult is a mechanism that uses:
-A block and a tackle; a combination of pulleys interconnected by a rope, basically what the crane is.
-Pulleys; a grooved wheel attached to an axis. This form the block and tackle.
-A drum hoist; cylinder onto one end of a crank is fitted. Enables us to lift heavy loads.
-A gear; a wheel with teeth along its perimeter.
-A connecting rod sytem; conected to the crank and to the gear.

The End

Alvaro's Catapult

I wanted you to know how the 1st of ESO B students managed to make technology works in Colegio Zuloaga. We have built so far 3 of 10 machines invented by Da Vinci. They are not too complex mechanisms (as it seems to me), made by plastic parts. First I will explain how we did the catapult.

The truth, is that we did not have any problems at the time of building it, because we followed the manual and it went pretty well. The two groups that I was with, did very well, our is an excellent class. The only fairly doubtful, was that a team mounted their catapult different to the other two groups, and we did not know which was the right way to do it. Finally, we saw that it was ours, because although their catapult was better, the instructions indicated it as we did.  

Also it must be said that it wasn't so difficult to make this work, because we saw these technological foundations in class. I'm going to tell you everything that we have related in this proyect to the book and the class of José, our technology teacher.

Forces: 

-Tension; the rope is subjected to this force.

-Compression; the pier to be supported in one piece, and compressed by another (at the top).

-Sheed; the pieces when snapping

-Bending; any elongated part fastened by both ends.

-Obviously stress force; nearly all the pieces subjected to some kind of force.

It is a shell, fixed structure with fixed-end and simply supported beams. It has pillars and columns.

It used a worm gear: This is a mechanism made up of a gear wheel that meshes into a worm gear on a cylindrical shaped drive shaft. This was moved with a fiddle crank system.

The catapult is a mechanism with:

-A crank system, you use this when you launch objects by the arm of the catapult.

-A worm gear: Similar to a rack and pinion system.

-A connecting rod mechanism; connected to the crank and the gear.

The only thing that I could add, is that I am impressed by all the technological foundations that the catapult has.