Day 4: (Mon Sep 13, Week 3) Mechanical Components

Notes for 2021-09-13.

New Assignments

1. New assignment, due in a week: Exercise: Actuated Marble Run Tile

2. In general, when uploading a video or zip file, please include your name or Andrew ID in the title since I often download them and it helps me track the files.

Agenda

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

   1. Can we discover some combinations of tiles which work well together?

   2. What can be observe about the effects of varying the slope?

   3. What new designs do the results suggest?

2. Quick review of SolidWorks part and sketch terminology.

3. More SolidWorks tips: part configurations, sketch blocks.

4. Working with SolidWorks assemblies.

   1. Mates

   2. Simulating joints with unconstrained freedoms.

   3. Four-bar linkage example.

   4. Assemblies and external dependencies.

   5. Actuated tile example.

   6. Importing standard parts.

      1. Physical Computing Lab Inventory

      2. McMaster-Carr

5. Lab part show and tell.

   1. F21 Course Kit

   2. Visual Part Guides

   3. Pivots and bearings

      • clevis pin

      • cotter pin

      • bushing

      • shoulder screw

      • ball bearing

   4. Fasteners

      • M3 machine screw

      • washer

      • self-tapping sheet metal screw

      • standoff, spacer

      • dowel pin

      • wire tie

   5. Components

      • spring

      • O-ring

   6. adhesives

SolidWorks Terminology of the Day

For more, please see SolidWorks Parametric CAD word list.

• mate

• fixed, float

• in-context feature

• component pattern

Figures

• http://507movements.com/mm_140.html

• http://507movements.com/mm_144.html

• http://507movements.com/mm_246.html

Four-bar linkage example, abstracted to simple link shapes. In the sample actuated tile above the ‘ground’ link role is played by the base, the input rocker is the servo horn, the output rocker is the ball driver, and the connecting link is a wire tie rod.