precision_modelling_1.pdf

001

Introduction

This guide was created to assist Artists and Engineers, to learn the basics of

mesh modelling of non deformable objects with 'Blender'. It uses a structured

approach to introducing Blenders tools and work-methods. Following the

guide should enable you to become familiar with blender and create models

from the simplest of parts to complex accurate engineering assemblies and

designs.

The guide focuses solely on Blenders Mesh Modelling capabilities, it ignores

the myriad of animation, texturing and photo-realistic rendering tools and

concentrates solely on getting started and producing accurate models suited

for both artistic and engineering purposes.

The guide was originally made as a series of web pages that documented the

design ideas and Blender methods used do design a few of the components I

will be making for a rebuild of my CNC router. It has been ported to this .pdf

book from the web pages, so some references in the guide will still only relate

to the on-line version.

The Small Print

This guide is provided as a free reference to new and existing Blender users. The contents of

copy on your computer or print a hard copy for personal use only. You may not use this guide

for any commercial purposes without written permission. (I have donated my time and knowledge

free to produce the guide, I don't expect people to make money from it)

THIS GUIDE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,

WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A

PARTICULAR PURPOSE.

Blender - Precision Modelling Guide

By: Robert Burke

www.rab3d.com

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Contents

Page No

Introduction

Contents

Getting Started

Overview of Controls

Blender Units and Precision

Modelling in Blender

Modelling a 608 Bearing

Part -1 Reference Geometry

Part – 2. The Inner and Outer Race

Part – 4 Modelling the Bearing Cage

Part – 5 Detailing the Cage Securing Clasp

Part – 6 Modelling the Dust Shield

Part – 7 Modelling the Circlip

Part – 8 The Low Polygon Bearing

Part – 9 Materials and Rendering

Part – 10 Constructing a Page Layout

Part – 11 The Scale Drawing Layout

Modelling a Guide Roller

Part – 1 Modelling the 'V' Roller

Part – 2 The Guide Roller Axle

Part – 3 Detailed Thread Profile

109

Part – 4 Laying out the Component Drawing

119

Designing a Casting

Part – 1 Positioning the Components

130

Part – 3 Roller Nut Mounting Brackets

136

Part – 4 Completing the Casting

148

Blender - Precision Modelling Guide

By: Robert Burke

www.rab3d.com

- 3 -

Part – 3 Adding the Ball Bearings

Part – 2 The Initial Layout

142

Starting Blender

There is a wealth of information available on the Internet in the form of

manuals, guides and tutorials that cover the full potential of this program. This

Guide is intended as a starter for people interested in the creation of mesh

models and more specifically, dimensionally accurate mesh models. Appendix

1 gives a short list of useful Internet links.

Obtaining and loading Blender

The Open Source and freely available creative package Blender can be

downloaded from www.blender.org. Once on the site, click the download link

to open the download page. Choose the file to suit your operating system and

follow the simple installation instructions at the bottom of the download page

to install the program.

What you see when the program starts

When you run blender for the first time you are presented with the default

screen. It contains the user preference’s window at the top of the screen. The

main 3D work area in the centre of the screen and the buttons window at the

bottom of the screen.

Blender - Precision Modelling Guide

By: Robert Burke

www.rab3d.com

- 4 -

A Quick Overview of the controlls.

Relevant sections of the program

When you first start modelling, the main two screens are already open, the 3D

workspace and the Buttons window. A cube object (1) is in the centre of the

3D view and the window is orientated so you are looking down onto the top of

the cube. There is also a Lamp (2) to illuminate the cube and a Camera (3) to

output a 2D bitmap of the cube.

3D View: Header Bar

At the bottom of the 3D view is blenders View Header Bar. The purpose of

each section within the view header is detailed below.

1) Window Type

Click on the window type button and a menu

will appear showing all the different window

types. Each window has a function within

the process of 3D modelling, image creation

or animation. However our initial interest lies

just with the following windows:

3D View:

Buttons Window:

This contains Blenders control

buttons.

Outliner:

A structured view of objects within the

3D scene and there relationships to

each other.

Script Window:

To run useful add on scripts.

2) Pull up menu

A context sensitive menu showing the operations that can be carried out and

the keyboard shortcut for the operation.

Blender - Precision Modelling Guide

By: Robert Burke

www.rab3d.com

- 5 -

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