MyDIY CNC

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MyDIY CNC

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Table of Contents

Introduction ……………………………………………………………………………………………………………………………….. 6
What is a CNC Machine ? ………………………………………………………………………………………………………….. 6
What is a DIY Desktop CNC Machine ? ……………………………………………………………………………………….. 7
Specifications ………………………………………………………………………………………………………………………….. 8
Overall Dimensions ………………………………………………………………………………………………………………. 8
Working Area Dimensions (metal base version) ……………………………………………………………………….. 9
Precision ……………………………………………………………………………………………………………………………. 10
Speed ……………………………………………………………………………………………………………………………….. 10
Power Requirements ………………………………………………………………………………………………………….. 10
MyDIYCNC Standard Spindle Specifications……………………………………………………………………………. 10
Possibilities ……………………………………………………………………………………………………………………………. 11
Limitations ……………………………………………………………………………………………………………………………. 11
Build Tools Required ………………………………………………………………………………………………………………. 12
Chassis Build ………………………………………………………………………………………………………………………. 12
Electronics Build …………………………………………………………………………………………………………………. 12
Terms and Conditions …………………………………………………………………………………………………………….. 13
Products, Content and Specifications ……………………………………………………………………………………. 13
Accuracy of Information ……………………………………………………………………………………………………… 13
Use of this document ………………………………………………………………………………………………………….. 13
DISCLAIMERS ……………………………………………………………………………………………………………………… 14
Plans …………………………………………………………………………………………………………………………………….. 15
Exploded Views ………………………………………………………………………………………………………………….. 15
Chassis Frame …………………………………………………………………………………………………………………….. 16
Steel and Aluminum ……………………………………………………………………………………………………………. 17
Wood ………………………………………………………………………………………………………………………………… 21
Uprights and Gantry Brace …………………………………………………………………………………………………… 22
Bearings Sub Frames …………………………………………………………………………………………………………… 25
Motors, Couplings, Rods and Screws …………………………………………………………………………………….. 30
Anti-backlash Lead Nuts ………………………………………………………………………………………………………. 33
X Table ………………………………………………………………………………………………………………………………. 35
Y Carriage ………………………………………………………………………………………………………………………….. 36
Z Carriage ………………………………………………………………………………………………………………………….. 38
Z Motor Mount ………………………………………………………………………………………………………………….. 39
Spindle Mount ……………………………………………………………………………………………………………………. 42
Wiring Diagrams …………………………………………………………………………………………………………………. 43
Hardware ………………………………………………………………………………………………………………………….. 45
Electronics …………………………………………………………………………………………………………………………. 46
Stepper Controller Module ………………………………………………………………………………………………….. 46
Spindle Controller Module …………………………………………………………………………………………………… 49
Creating your Parts ………………………………………………………………………………………………………………… 51
Notes on Precision Cutting and Drilling …………………………………………………………………………………. 51
Rods and Bearings. ……………………………………………………………………………………………………………… 51
Position of Axes in Relation to Each Other …………………………………………………………………………….. 53
Building your DIY Desktop CNC Machine ………………………………………………………………………………………. 56
Chassis Frame………………………………………………………………………………………………………………………… 57
Cutting and Preparing Rods and Lead Screws ……………………………………………………………………………. 60
Gantry Support Uprights and Brace ………………………………………………………………………………………….. 60
X Rods, Bearings and Table ……………………………………………………………………………………………………… 62
Gantry and Carriages ………………………………………………………………………………………………………….. 64
Y-Z Assembly ……………………………………………………………………………………………………………………… 64
Axes Drivetrains …………………………………………………………………………………………………………………….. 67
Motor Couplings ………………………………………………………………………………………………………………… 67
Drivetrain Assembly ……………………………………………………………………………………………………………. 68
Stepper Motor Mounting …………………………………………………………………………………………………….. 70
Test Your Axes ……………………………………………………………………………………………………………………. 71
Power Supply and Enclosure ……………………………………………………………………………………………………. 71
Modifying and Preparing your Power Supply …………………………………………………………………………. 71
Mod for non-PC operation …………………………………………………………………………………………………… 72
Selecting the Required Power Feeds …………………………………………………………………………………….. 72
Attaching the Electronics Enclosure (optional) ……………………………………………………………………….. 73
Wiring Motors and Limit Switches ……………………………………………………………………………………………. 75
Stepper Motor Wiring …………………………………………………………………………………………………………. 75
Limit Switches (optional)……………………………………………………………………………………………………… 75
Electronics Wiring ………………………………………………………………………………………………………………….. 78
Connecting a DB-25 male Connector …………………………………………………………………………………….. 78
Wiring the PC Parallel Port Connector …………………………………………………………………………………… 79
Power Connections ………………………………………………………………………………………………………………… 80
Configuring your PC and CNC app ………………………………………………………………………………………………… 81
General Setup ……………………………………………………………………………………………………………………….. 82
DIY Desktop CNC Machine Software Configuration Parameters: ………………………………………………. 82
KCam (Windows XP/98) ………………………………………………………………………………………………………….. 83
EMC2 (Linux) …………………………………………………………………………………………………………………………. 89
Other CNC Applications (Mach3, TurboCNC, etc.) …………………………………………………………………….. 100
Expanding Your DIY Desktop CNC Machine …………………………………………………………………………………. 101
Workspace Dimensions …………………………………………………………………………………………………………. 101
Table Travel Mod ……………………………………………………………………………………………………………… 101
Spindle Upgrades …………………………………………………………………………………………………………………. 102
Stepper Motor Upgrades ………………………………………………………………………………………………………. 103
Larger Stepper Motors ………………………………………………………………………………………………………. 103
Salvaged and Recycled Stepper Motors ……………………………………………………………………………….. 104
Electronics Upgrades ……………………………………………………………………………………………………………. 107
The Spindle Control Module ………………………………………………………………………………………………. 107
Alternate Stepper Motor Drivers ………………………………………………………………………………………… 109
Future MyDIYCNC Developments ……………………………………………………………………………………….. 109
Getting Support ……………………………………………………………………………………………………………………….. 110
Your MyDIYCNC account ……………………………………………………………………………………………………….. 110
The MyDIYCNC Online Forum …………………………………………………………………………………………….. 110
Troubleshooting …………………………………………………………………………………………………………………… 110
Appendices ……………………………………………………………………………………………………………………………… 121
DIY Desktop CNC Machine Master Bill of Materials ………………………………………………………………….. 121
MyDIYCNC Stepper Driver Module Bill of Materials ………………………………………………………………….. 125
MyDIYCNC Spindle Control Module Bill of Materials ………………………………………………………………… 126
MyDIYCNC Stepper Motor Signal Exerciser ……………………………………………………………………………… 126
Wiring Diagram ……………………………………………………………………………………………………………………. 127
DIY Desktop CNC Machine Wiring Diagram color codes…………………………………………………………. 128
Stepper Motor Mount Holes (NEMA 17) …………………………………………………………………………………. 129
INDEX …………………………………………………………………………………………………………………………………….. 130