CNC V3.2 - Router

The video about the first run of CNC v3.2

Basic build instructions

Cutting fluid

Mechanics

Figure 1:
Even if the machine made it's first run, it is still in an experimental state and work on the design goes on.

User Unrud has created a new version of my openSCAD model on Github with a better readable source code and all the drill holes included. After that he wrote a Python script that extracts the table of parts length and drill scheme automatically. Fantastic work, many thanks!
https://gist.github.com/Unrud/61cfb145a9026b9bebab6ba41143373f

Parts list

Part	Number	Remark
Steel square tubes 20x20x2000mm, 2mm wall thickness	20	Framework
Flat iron bars 20x4x2000mm	10
Screws M6x10mm	400	Preferably with round head for hex or torx tools
Nuts M6	100
Split washers M6	400
Ball bearings 10x30x9mm	45
Ball bearings 6x19x6mm	10
Threaded rods 6mm, 1m	3
Threaded rod 10mm, 1m	1
Nuts M10	100
Sheet metal 300x500x0.75mm	1
Plywood 300x600x5mm	1	Gear disc
Pump 12V	1	Cutting / coolant e.g. windscreen washer system

Samples

Cutting and engraving acrylic plastic with the CNC router

Figure 2:
Engraving and cutting acrylic plastic works fine.

Figure 3:
Same is for plywood.

Cutting circuit boards with the CNC router

Figure 4:
The copper plated board bends and vibrates when cutting the traces. I will implement a special mount for this kind of job. Nonetheless the result isn't bad.
The 16 rings on the bottom left are arranged on a 2.5mm grid as used with prototyping boards.

Figure 5:
Processing aluminum works fine, but there is still space for improvement. I will implement a water pump for a circular flow of coolant so that the chipping is removed. With that I hope to get smoother edges.

Figure 6:
Engraving glass at the first test run. It's the Hackaday logo.

Figure 7:
Carving another piece of aluminum with a 3.2mm router bit at the end of the video about the build process of the mechanics.

Electronics

Figure 8:
An Arduino and two doubble H bridges are needed to control the machine in the low power configuration I am using in the first videos. More ways of driving the machine will follow (e.g. using bipolar stepper motors).

Software

The software is part of the Download package. It is in an experimental state and can currently process nothing but Scalable Vector Graphocs (*.svg). I will implement G-code functionality in the machine electronics soon.

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