Week 4: More Mechanisms

Overview

We will review our mechanism prototypes, discuss next steps, problems, materials, tools, and design.  Also, we will explore more amazing mechanical assemblies.

 

This weekend I got to see Arthur Ganson’s (one of my favorites) work in real life at the MIT Museum.

Cory’s Yellow Chair
Machine with Roller Chain
Machine with 23 Scraps of Paper
Margot’s Cat

More videos

 

Review of our Mechanism Prototypes

What do we have so far?  Where do we want to be in a week?  What is holding us up?  Do we have questions on materials?  Are there tools or techniques that can get us further along?

We can schedule some time on the Othermill, CNC, 4 axis, and metal lathe if we think this will help.

 

Combining Mechanisms

Simple Mechanisms can get complicated fast when putting them together.

Crank and pulleys and belt

Simple Mechanisms can get complicated fast.

 

Slider Crank with Satellite Pulley

 

Omni—Wheel Based Driving Device with Belt Transmission Mechanism

Indexing Mechanisms

Geneva Mechanism

3 Gaps Geneva

Rim and Pins

 

Lining Up Mechanism

 

Rest

 

Spacial Geneva Mechanism

 

Mechanism For Drawing Circle

 

Scissor Mechanism

 

Controlling Rotation Around a Point

 

Mangle Wheel-Pinion Reciprocating Mechanism

 

Wobbling Disk

 

Star Wheel Index Mechanism

 

Chain Self Centering Gripper

 

Sphere Rotating Around Two Perpendicular Axes

 

Friction Sphere Variator

 

Cable Drive

 

Lateral Motion Mechanism

 

Whitworth Quick Return Mechansim

 

Hardware

Another reminder of potentially helpful hardware.

 

Idler Shaft are great for securing pulleys, bearings, wheels, and individual cams.

 

 

Tight Tolerance Shoulder Screw are great for securing pulleys, bushings, bearings, and individual cams.

 

Prime-Line Products D 1503 Steel Ball Bearing Sliding Door Roller, 1-1/2-Inch, 2-Pack and 1-1/2 Inch Steel Rollers can be used with o-rings, belts, and rubber bands.  The 1/4″ bore can be used with all of the 1/4″ hardware you have been provided.

Lubrication – WD-40, 3 in 1 oil.  If it needs to move, it probably needs lubrication.

 

Loctite Red 271.  If it needs to stay put, a little Loctite will probably help.

 

Standoffs, using standoffs makes breadboarding mechanisms easier.

 

Spacers, are a great way to get elements into proper position.

 

Assignment

Your two week Building a mechanism project will be due.  You will complete a robust, functioning mechanism

 


Related Reading/Viewing

Wheel Testing

Lifters Testing

Test Run of Tiny Wheel

Test Run for Wheel Ball Lifter

Test of Marble Machine

Stairs Lifter

Test of First Slope

Twin Linkage Lifter 

Tree and Funneling Test

Instruction of Wire Work