Presented at DooThings CNC MeetUp Pune

1. CNC 101 Jumpstarting with CNC @
Doo Things,Pune
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2. WHAT IS A CNC?
CNC stands for Computer Numerical Control. Its is a control method
where a motion is controlled by a numerical input which is computer
generated/controlled.
But the term is now being used to describe (like Xerox and Photostat)
machines that understand directional commands to achieve a job that
is computer generated using a CAD/CAM model.
So, the 3D Printer is a CNC , The CD ROM also has a CNC and CNCs
are all around us. Just that we use the term specifically for machines
involved with manufacturing.
Manufacturing.. Hmmm
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3. HOW THINGS CAN BE MADE?
There are two kinds of manufacturing models (broadly) :
Additive (3D printing using FDM like in RepRaps/MakerBots)
Subtractive (Milling and Drilling)
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4. POPULAR CNCS AROUND
Commercial CNC Setups
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5. POPULAR CNCS AROUND
ShopBot Desktop
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6. POPULAR CNCS AROUND
DIY Versions
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7. POPULAR CNCS AROUND
ShapeOko 2
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8. ESSENTIAL COMPONENTS IN A CNC
1. Axis Drive
1. Belts
2. Lead Screw/Nut
3. Backlash
2. Spindle/Laser
3. Axis Motion Guide
1. Linear Bearing on Steel Rods
2. Linear Rails
3. Cylindrical Bearings on T Slot
Extrusions
4. Build Material
5. Motors
6. Drivers
7. Controller/Interpreter
8. Power Supply
9. Computer Interface
10.Axis Layout
1. X on Y with Independent Z
2. Gantry Style
3. Z on Y with Independent X
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9. BELTS
Belt based motion drive
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10. LEAD SCREW/NUT
LEAD Screw based drive
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11. SPINDLE/DREMEL/CLONE
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12. AXIS GUIDE
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13. STEPPER MOTORS(BIPOLAR)
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14. DRIVERS –TI AND ALLERGO
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15. GRBL AND ARDUINO
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16. CNC 2D WORKFLOW
CAD CAM G-CODE
Inkscape/Corel Draw MakerCAM/HeeksCNC Universal Gcode Sender
(grbl)(Linux/Win/Mac)
/GRBL Controller (Windows)
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17. INKSCAPE
Open Inkscape
Create Text/Shape (scale to the size you want)
Select your text (with the arrow) and move it to X=0, Y=0 via the
menu bar (shown in red rectangle -> )
With the text selected, click Path -> Object to Path
Ungroup your new paths, click Object -> Ungroup (you'll notice each
letter now has a box around it)
Save your file as SVG (*.SVG), close inkscape
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18. MAKERCAM
1. Go to makercam.com
2. Add SVG or make a circle or any shape
3. Change the dimensions to cm (or one used on your CNC)
4. Add operations to different paths using CAM drop down
5. After all, perform Calculate All
6. Then export Gcode
7. You can view gcode online(gviewer) or offline(UGS/GRBL Controller)
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19. MAKERCAM DEMYSTIFIED
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20. ALL DONE! STREAM IT
After you have the gcode, all you need to do is stream the gcode to
the Arduino with GRBL flashed.
The popular software that do the streaming for GRBL are:
Universal Gcode Sender (grbl)(Linux/Win/Mac)
GRBL Controller (Windows)
CAUTION: Before streaming a lot of calibration constants need to
flashed on the Arduino in order to move the motors according to your
config!
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