Fab Lab Ciudad de México

Mexico City

Mechanical and Machine Design (Group Assignment) Objective: Design a machine that includes mechanism + actuation + automation Build the mechanical parts and operate it manually Document the group project and your individual contribution Actuate and automate your machine Document the group project and your individual contribution This week is collaborative effort with all our fellow students of the Node. In this case, we as Ciudad de México FabLab, as a team, decided to try designing a time lapse rail for a Smart phone, whether is an iPhone or Android, and integrate a myriad of printed, cutted and existent pieces. The main background is based on a typical rail with an automated system. Research: The original design, is a time-lapse rail with a timing belt as a dolly that moves along an axis, and the camera is attached to an articulated monopod; this raw model was developed in SOLIDWORKS®, as a simple short rail, translated from STEP to Rhino and IGES files, for compatibility. Main specifications are: Nema 17 External 48mm Stack 0.4A Lead 2mm/0.07874" Length 300mm Nema 17 Bipolar 1.8deg 45Ncm (64oz.in) 1.68A 2.8V 42x42x48mm 4 Wires Single wall corrugated cardboard sheet available in brown, recycled and virgin papers, from SG to 55 ECT. ABS 3d.printer filament (Acrylonitrile-co-butadiene-co-styrene Polyethylene terephthalate Polycarbonate) Horizontal bearing 1/4" Timing belt 1/2" for printed dolly Socket head allen screw various diameters Stainless steel Rod, 3/8" 2ft long
Process of designing and development Original model:
First iteration, sharing to a different platforms, from STEP to DXF, 3DM and IGS
First change, the Smart phone monopod with an external structure to fasten properly with clamps. https://www.thingiverse.com/thing:2498739
First change, the Smart phone monopod with an external structure to fasten properly with clamps. https://www.thingiverse.com/thing:2498739
Now the model looks slimmer and more elegant
Here, we are determining the envelope and applying physics principles to the bars, integrating the liitle stepper motor along the axis and the dolly.
Finally, a group revision... what if the dolly became a single 3d-printed box
How to avoid unexpected vibrations when moving...
And how to make it a lot more stable while moving
Then we manage to discuss what if the rods got a little bit more apart, to give way for the stepper motor to fit in the dolly, and secure the bearing along the rod.
Finally, the model evolved to a more static piece, using the main axis, setting in the beginning of the box all electronics.
A second prototype to see how it might work with this assembly

Copyright Fab Lab

Ciudad de México 2021