Mechanical Systems - fablabnepal1/Desktop-Braille-Printing-Machine GitHub Wiki

The braille printer consists of different mechanical components such as housing, belts, and pulleys.

1. System Box and Housing

In this project, a system box and housing for a Braille printing machine were successfully designed and fabricated using laser cutting technology. The process began with conceptualizing and sketching the design while considering dimensions, component opening. A 3D model was then created using CAD software, serving as a digital blueprint for fabrication. Suitable materials were selected for each component, ensuring compatibility with the laser cutter. The design was optimized for laser cutting, with tolerances, material thickness, and kerf considered. Individual components were prepared as 2D vector files and imported into the laser cutter's software for fabrication. Each component was carefully cut, cleaned, and inspected for defects before assembly.

During assembly, components were slotted together in a sturdy structure. Finishing touches, such as sanding, painting, and labeling, were applied, followed by testing the Braille printing machine in its new enclosure, confirming proper functioning and design requirements were met.

2. Shafts and Paper Rollers

A stainless steel shaft and paper rollers were successfully fabricated using cutting and fitting techniques for the shaft and silicon molding for the rollers.The process began with sourcing a stainless steel rod for the shaft. The rod was precisely measured and marked according to the required dimensions. Using a metal cutting saw, the rod was carefully cut to the desired length. Afterward, a bench grinder was employed to smooth the edges and ensure a proper fit with the roller components. For the paper rollers, a silicon molding process was used. First, a master pattern was created using 3D printer with precise dimensions. This pattern was then used to create a silicone mold by pouring liquid silicone rubber over the pattern and allowing it to cure.

3. Bearing and Housing

A bearing and bearing housing were successfully integrated using a purchased bearing and a 3D printing technique for the bearing housing. The process began with selecting an appropriate bearing based on the required specifications for the project. Once the bearing was acquired, the focus shifted to designing and fabricating a suitable housing. A 3D model of the bearing housing was created using CAD software, ensuring that the design would securely hold the bearing in place while allowing for smooth rotation. Once the 3D model was finalized, it was exported as a printable file and sent to a 3D printer. Using a suitable filament material, such as PLA, the bearing housing was printed layer by layer until the complete part was formed. After printing, the housing was carefully removed from the build plate, and any support structures were cleaned off. Next, the bearing was test-fitted into the housing to ensure a proper fit.

4. Pulley and Belts

Next, a suitable belt was selected and purchased . Then, A 3D model of the pulley was created using CAD software, ensuring that the design matched the specifications of the belt, such as pitch, width, and diameter. Once the 3D model was finalized, it was exported as a printable file and sent to a 3D printer. Using a suitable filament material, such as PLA, the pulley was printed layer by layer until the complete part was formed. After printing, the pulley was carefully removed from the build plate, and any support structures were cleaned off. The belt was then test-fitted onto the 3D-printed pulley to ensure a proper fit and smooth rotation.

5. Rails and Pulleys

Rails and pulleys from old 3D printers are reused.

6. Linear bearing and Housing

Linear bearing from old 3D printer is used and the housing is modeled in CAD and then 3D printed.

7. Other mechanical parts

Other mechanical parts are also modeled and 3D prrinted for their best used. Those parts are solenoid support, Limit switch housing etc.