PCB CNC

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gmoney484
Posts: 3
Joined: Wed Nov 09, 2016 8:52 pm

PCB CNC

Postby gmoney484 » Thu Feb 16, 2017 2:57 am

Hi all
Just showing off our CNC. We are a secondary school and we use this primarily for milling PCB boards for our senior electronics class.

It started off as a C-Beam machine from OpenBuilds, but its been modified and upspec'd along the way (big shout outs to CNCkits and Protoneer for their help).

The original control was via MACH3 and a MACH3 parallel controller. You can see the custom made control and power box. Three power supplies:
- 5v for Mach3
- 12v for spindle
- 24v for steppers
- emergency stops and all that sort of stuff needed for Health and Safety.
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The spindle is a ESC type (the first iteration was a much larger one, but too big for our needs). There was a small board to convert the PWM to ESC, but we replaced that. We also used a Protoneer arduino CNC shield.. but.....

The new controller was simplified because I realised I didn't need that sort of power for PCBs and also I hate pin connectors.. i love screw connectors so I went with the Raspberry Pi CNC Shield (simply because of the screw connectors..).. could I use it in place of the original CNC shield without a Pi? I wonder.
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Anyway, the Pi running bCNC works perfectly, so I replaced the original control box with parts recycled from a PC including the power supply - its a neat solution. Sadly, my 160W supply is too small to run steppers and spindle so Im going to upgrade to a 400W supply this week.

I also replaced the PWM to ESC circuit board with an arduino. I used software to do the conversion, but Im still going to add a low-pass filter to smooth things out.

Not everything is working completely yet. I need to tweek the arduino, add end-stops, calibrate GRBL etc etc, but it makes pretty sweet PCBs.

More to come.
Attachments
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cntrlr2sml.JPG (171.61 KiB) Viewed 23 times
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cntlr1sml.JPG (163.65 KiB) Viewed 23 times
CNCsml.JPG
CNCsml.JPG (148.05 KiB) Viewed 23 times
Last edited by gmoney484 on Sat Feb 18, 2017 7:58 am, edited 1 time in total.
Gavin Milne
HoD Science
Dilworth School

Bertus Kruger
Site Admin
Posts: 577
Joined: Wed Feb 03, 2016 10:26 pm
Location: Wellington , New Zealand
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Re: PCB CNC

Postby Bertus Kruger » Thu Feb 16, 2017 10:23 pm

Nice work,very neat setup... Do you have any sample PCB's?

gmoney484
Posts: 3
Joined: Wed Nov 09, 2016 8:52 pm

Re: PCB CNC

Postby gmoney484 » Mon Feb 20, 2017 6:31 pm

It's gone? It's back :)
Gavin Milne
HoD Science
Dilworth School


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