Copy of Progetto Etwinning "Scotch Yoke"

5^A Meccanica and BTS CRSA

Design

BTS CRSA

• Creating sketches and parts on SolidWorks taking into account the dimensions suggested in the online meeting
• Work planning: each student comes up with their idea , in order to choose the best one
• Joining components on SolidWorks assembly to study the motion, weaknesses, accuracy and how overcome failures.

Assembly: Italian side

THE START OF LINEAR SIDE ASSEMBLY

Many components had to be fastened by a rigid coupling (coupling with interference), so the part before being inserted was cooled then stuck in its hole, in fact PLA the polymer used, shrinks when cooled.

Connecting our assembly to the electromechanical 5/2 bistable valve

French side

Printing

Technical trials

Project Union

Once the the project was completed by both schools, another virtual meeting was organized to illustrate the functioning of the respective parts and to organize the face-to-face meeting in which the italian side would have been explained.

In Paris italian students visited the twinned school.

Meeting

Videolesson on twinspace

Problem solving

Union of the Italian linear side to the French rotating side.

In this online meeting with the twinned class in France, it has been discussed and divided the tasks of the project. The meeting took place online, on the eTwinning platform, and took place completely in English. In short here is what we talked about:

• Introduction
• Project illustration
• Objectives to be achieved
• Division of tasks between schools
• Sharing source files

After assembling all the components it was necessary to start the whole thing. The operation was simple: once the switch and the compressed air were turned on, the pistons had to move alternately, and through the slot the rectilinear motion had to be converted into a circular motion.

The problems were 2:

• The pistons did not alternate because the sensors that had to send the air into cylinders were not well settled (delay-advance adjustment)
• The shaft that had to rotate didn't work, blocking the pistons, because it did not have the necessary strength to win over the standstill .

Planning

Once the pieces were printed, it became clear that some of them needed to be worked, such as the cylinders that needed to have a better finish inside. So it was decided to perform post-production improvements with reamers and machine tools.

To resolve these problems, the sensors had to be adjusted so that they did not get stuck and the flywheel had to be weighted, because it wasn't enough heavy to make the scotch yoke work .

Meeting: virtual meeting on the eTwinning platform between the twinned schools in order to illustrate the project and the achievement

Design : components design on SolidWorks and work planning

Printing: printing all the components by a 3D printer in PLA

Assembly: assembling all the printed components

Project union: joining of the 2 parts of the project by the 2 schools

We were about to lose our hope, when suddendly...

Italian side

5^A meccanica

and

BTS CRSA

present

eTwinning project

and

LYCÉE VOILLAUME

Challenge

The project involves the construction of a prototype that converts a circular motion into a linear alternating motion that is activable on both sides: linear and rotary. The work was divided into the two schools:

Linear part 5 ^ A MC ITTMarconi

Rotary part LYCEE VOILLAUME BTS CRSA

About the linear part, a pneumatic system of two pistons and cylinders fed by a bistable 5/2 solenoid valve was designed (Fig. 2) and two end stops. As limit switches, two magnetic "Reed" sensors were used, as they have a minimum size and could be activated by a magnet placed on the rotating disk

eTwinning "Scotch Yoke" project