Day 6: (Mon Sep 19, Week 4) Introduction to 3D Printing

Notes for 2022-09-19.

Notes from Day 5

  1. Brief comments on emails received over the weekend.

New Assignments

  1. New assignment, due in a week: Exercise: Marble Fidget Toy.

Agenda

  1. In-class testing of the actuated marble run tiles.

  2. Discussion of the next assignment.

  3. Brief introduction to the DC gearmotor. (See also Motors and Actuators).

    ../_images/dc-gearmotor-25mm.png

  4. Demo of the DRV8833 motor driver (See also Motor and Power Drivers and DC Motor Examples - Raspberry Pi Pico).

  5. Introduction to 3D printing.

    • additive vs subtractive manufacturing

    • many commercially available processes

    • FDM process (fused-deposition modeling, aka fused filament fabrication)

    • IDeATe Stratasys “Continuous Build 3D” machine

    • time and money costs

    • process and machine limitations

  6. Cura demo to show general principles.

    • STL files

    • slicing

    • infill, support

  7. SolidWorks 3D design technique.

    • reference planes

    • walkthrough of the fidget-2 sample

      • mid-plane extrusion

      • sweeps

    • walkthrough of the fidget-3 sample

    • comments on 3D sketches

  8. Stratasys 3D printer and workflow.

    https://resources.ideate.cmu.edu/wp-content/uploads/2019/03/20190225_162938-e1551455078272-169x300.jpg

    • six printers in parallel, continuous printing onto mylar build sheet (consumable)

    • staff approve each print, may refer some to instructor

    • course parts should have comment ‘please charge to 16-223’

    • post-printing chemical bath to remove support

    • design checking: overlap, mass properties, clearances, assembly

    • STL export

    • Skylab interface

  9. In-class sketching and CAD experimentation.

Videos