I need to get the detailed mechanical design properly underway to ensure I haven't forgotten to order some critical parts.

This blog covers design of the wheels and motor mounts.

This video animates some of the CAD models to show their detail:

The steering and drive mechanism is pretty complex as the steering wheel is also the drive wheel.

The drive motor mount has a steering post on it to allow the steering motor to control direction of the drive motor. This motor housing has a very complex interior to fit the drive motor precisely. This type of shape would be very difficult to machine or make by hand, so it is very lucky I have access to a 3D printer.

Here is a video showing 3D printed parts of the drive mechanism and how they work:

Next I can get started on the main mechanical chassis. This is a little tricky since I don't have all the parts that will attach to it yet.

At this stage everything seems to be going smoothly but it is only when you try to connect everything you discover why it won't work...

 

Relevant Links

Sixth Sense Design Challenge: About This Challenge

Sixth Sense Design Challenge: Technical Documents

Sixth Sense Design Challenge

 

GraffitiBot Project Blogs

Sixth Sense GraffitiBot - blog 1

Sixth Sense - Kit Unboxing and Other Parts - GraffitiBot blog 2

Sixth Sense - Sensor Circuits - GraffitiBot blog 3

Sixth Sense - Interfaces - GraffitiBot blog 4

Sixth Sense GraffitiBot - System Interconnect - blog 5

Sixth Sense GraffitiBot - Wheels & Motors - blog 6

Sixth Sense GraffitiBot - ST Sensor Tile App - blog 7

Sixth Sense - Load Cell PCB - GraffitiBot blog 8

Sixth Sense - Magnetic Angle Sensor - GraffitiBot - Blog 9

Sixth Sense - LCD Interface - GraffitiBot - blog 10

Sixth Sense - Pump Controller - GraffitiBot Blog 11

Sixth Sense Main Drive Motor - GraffitiBot - blog 12

Sixth Sense Motor Controller Mods - GraffitiBot blog 13

Sixth Sense - RTD - GraffitiBot Blog 14

Sixth Sense Mechanical Design - GraffitiBot Blog 15

Sixth Sense GraffitiBot Motor Wiring - Blog 16

Sixthe Sense GarffitiBot - First Dry Run - Blog17

Sixth Sense GraffitiBot Hydraulics - Blog 18

Sixth Sense GraffitiBot Printing Graffiti - Blog 19

Sixth Sense GraffitiBot - Summary - Blog 20