OSE Universal Axis

For cartesian x,y,z Machines

This presentation is open-source share-alike by attribution, unless otherwise stated

Lecture created by:

Andreas Sjöstedt

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About this Lesson

Preparations

• Part of OSE STEAM Camp.
• For updates contact:
• The rest of the course content is found here: https://wiki.opensourceecology.org/wiki/OSE_Lesson_-_Universal_Axis

• Check the geneology for the newest version
• Make sure you have FreeCAD installed
• Make sure you have all the files for 3D printing
• Make sure you have all the parts
• Use the D3D Build manual for guide and reference

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The Universal Axis

We will use the newest universal axis design which is a simplification in parts and assembly from previous versions.

The simplified version uses set screws to fix rods and bearings. Alternatively use crazy(?) glue instead of set screws.

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Modulare 3D printers, CNC, drill and plotters

Universal axis

D3D Universal

D3D Pro

D3D Mini

Each of these comes in various sizes

3D printing

CNC Milling

PCB Plotting

Sizes (arrow suggests standards, not limits)

8mm

1 inch

2 inches

Modulare 3D printers, CNC, drill and plotters

Universal axis

D3D Universal

3D printing

Sizes (arrow suggests standards, not limits)

8mm

We will use the 8mm rod design to make a D3D Universal for 3D printing. The D3D universal can be built with either 1 or 2 z-axis, we will build it with two z axis for extra stability. We shall also build 1 x and 1 y axis.

Components

Universal Axis

Idler

*printed circuit board

Learning Exercise

Task

• Open the D3D Production manual, and follow the instructions to build the x, y, and 2-z pieces, but incorporate the changes to the simplified universal axis in the following slides
• OSE D3D Universal Production Manual

Simplified Universal Axis Slide 1

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Goal: Build simplification of D3D Universal (and other printers)

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Issue: Clamshell is typically 2 pieces + 4 bolts + 4 nuts.

• Simplify from 10 pieces to 1 piece
• 5x+ part count reduction.
• Unique part count is reduced, and overall part count is reduced significantly.

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Solution:

• Make monolithic pieces instead of clamshells
• Account for insertion of inner components
• Use set screws to fix rods and bearings - 6 mm x 10 mm set screw is already used in GVCS
• Or avoid set screws and dab a little crazy glue

Motor Side

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Transform nut catcher into a thread-in nut-catcher - meaning 4.7 mm plastic hole at 30 mm separation

Add set-screw hole

Function of 6 mm hold is mounting only, not clamping of 2 clamshells.

Symbolic diag of MVP

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Simplified Universal Axis - Idler Side

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Goal - Simplify Idler Piece

• Old - 3 bolts, 3 nuts, 2 clams, 2 bearing
• 10 pieces
• New - 1 clam, 1 nut, 1 bolt, 2 bearing
• 5 pieces
• Notes - light duty nut catchers: only plastic; fine for most applications with 6 mm hole

Goal - Simplify Carriage Piece

• Old - 4 bolts, 4 nuts, 2 clams, 2 bearings
• 12 pieces
• New - 1 clam, 1 nut, 1 bolt, 2 bearing, 2 set screws
• 5 pieces
• Notes - light duty nut catchers: only plastic; fine for most applications with 6 mm hole

Belt hole

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Belt hole

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Bearing Hole

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Bearing Hole

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Simplified Universal Axis - Carriage Side

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Goal - Simplify Carriage Piece

• Old - 4 bolts, 4 nuts, 2 clams, 2 bearings
• 12 pieces
• New - 1 clam, 1 nut, 1 bolt, 2 bearing, 2 set screws
• 5 pieces
• Notes - light duty nut catchers: only plastic; fine for most applications with 6 mm hole

Cover piece with 2 bolts

Exercise introduction

1. start a project. You start by editing a diagram, not the physical layout reality. That is called a schematic. the schematic is later converted into a physical layout.
2. Drag and drop components into the design
3. You must then connect them, and verify the design for connection errors.
4. Once you have the schematic, you can add physical reality to it. This consists of moving components around and rotating them in order to make the easiest connections. adding footprints for components and wire thicknesses. The footprints concept is that any component can come in various packages (or size/shape). We must specify exactly which package we are using.
5. Once we add packages and wires, we save the layout

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source, KiCad 101 OSE wiki

Exercise 1 - Arduino Mini

• Arduino mini is made directly on the chip, so no PCB board
• Preparation
• Video 1
• Video 2
• Exercise
• add components
• wire components
• add wholes
• export as a file for cutting
• g-code with flatcam -> Marlin

Exercise 2 - Arduino on a board

• Arduino on a PCB board
• Preparation
• Video 1
• Video 2
• Exercise
• design schematics
• design PCB
• g-code through flatcam -> drill

More resources

Electronic design automation - EDA

• Schematic editor, pcb layout and CAD programs are closely related
• Gerber file is an intermediary file which contains all the information needed for a PCB manufacturer to produce the board
• KiCAD is a program which includes tools to manage the project, the schematics, the PCB layout (VRMK +IDF), and generate a Gerberfile if needed.�

PCB Manufacturing process

• By

schematics

board design

print board

mount components

Resources - Links

• External tools
• including KiCadstepupmod which allows collaboration between FreeCAD and KiCAD
• including KiCost which not only generates BOM but also search suppliers for prices and creates a cost estimate for your project
• KiCAD to FreeCAD - OSE resource

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KiCAD for EDA

A More Detailed Overview

KiCad Overview

A More Detailed OVerview

Internal

External

Maslow’s Hierarchy of needs

Reinforcement Theory

Content

• Stuff

Discussion

optional

Discussion points

• Read this lesson’s wiki-page, watch the video and choose an aspect of it which interests you and start/join a discussion about it. Also find another resource which supplements your understanding.�
• Draw from your own experiences when possible, using concrete examples or imagined scenarios.

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