[Makerspace] A CNC machine :)

Felix Sheldon darkpaw at internode.on.net
Mon Aug 21 08:43:17 AEST 2017


Tony, who I think is on the list, has made a small machine for PCB routing,
it was an excellent simple design. I happen to have most of the parts for a
3D printer which could be re-purposed for that. I don't know if there is
any firmware to suit milling for the RepRap style electronics though.

Had you seen this by the way Greg?

http://touchterrain.geol.iastate.edu/

It makes STL files for relief maps, uses the 30m SRTM terrain for Australia.

It might be a very long print time for a large map, but it may not be so
bad with one of the larger bed printers:

https://core-electronics.com.au/lulzbot-taz-6-3d-printer.html

https://www.aliexpress.com/store/product/7th-Anniversary-Sale-CREALITY-3D-Large-3D-Printer-Size-500-500-500mm-DIY-Kit-Aluminum-Heated/2846085_32803679059.html



On 20 August 2017 at 18:17, Greg Hall <greghall at brushbox.info> wrote:

> I've been keen on a flat-bed CNC router for quite some time.
>
> A quick look around reveals some very affordable kits, some with the
> precision to route PCBs, which I expect would be popular. Is there already
> an accessible such tool in Newy? Do I hear that there's already one that
> can be loaned to the 'space? That would be a good way to test the
> enthusiasm, at least before launching into a larger or more specialised
> project.
>
> Looking up the scale to working in plywood or MDF for furniture or (one of
> my favorites) the production of 'Raised Relief' maps would require a larger
> home than we have now, but with persistence (and good housekeeping), we
> might get to use half of the left-hand side garage.
>
> -
>
> Another wild thing we might build could be: http://www.maslowcnc.com/
> brings a full sheet of plywood and an electric router to the hanging
> plotter!
>
> -
>
> There's a (probably biased) review of machines at
> http://www.scan2cad.com/cnc/best-cnc-kits-beginners/ and a homebuild that
> looks OK at http://woodworkerb.com/home/diy-cnc-machine/
>
> woodworkerb points us to http://www.autoleveller.co.uk/ which seems like
> a very good way to get better Z-axis accuracy out of these simpler machines.
>
> I'd welcome pointers to reviews and designs that we can trust.
>
> -
>
> Of Raised Relief maps, we have bought a few over the years from the (now
> sadly closed) map shop in Castlereagh St, Sydney, and they are much loved.
> Ours were made by Litografia Artistica Cartografica but the artist retired
> and it's a very different company now.
>
> The technique is described at http://www.terrainmodels.com/
> thermoplastic.html & http://www.terrainmodels.com/computer.html & a nice
> article at https://en.wikipedia.org/wiki/Raised-relief_map
>
> The map we have at home measures 70 x 90 cm, which would be a nice size.
> Plaster is the usual material for the master, but Hebel aerated cement
> could save drilling the thousands of tiny airways, should we wish to
> reproduce them using vacuum forming. Either way, fairly abrasive dust to be
> handled by a decent extractor system. I wouldn't want to do this to a good
> CNC. This work shouldn't need any more accuracy that can be had using
> toothed belts for positioning. We _might_ get away with a succession of
> vacuum cleaners;) I suspect this would be a 'take it outside and do it
> there' type of job.
>
> On the other hand, if there's a smaller machine to be borrowed, I'm sure I
> could constrain myself to friendlier materials like MDF, and make tiles to
> fit together until (if) there's sufficient enthusiasm for a large,
> dedicated machine. The model of Mt. Kosciusko on the map of NSW that we
> have measures only ~27mm high, so pre-laminated MDF or plywood would be OK.
>
> -
>
> One of the other projects that I daydream of is smartening up the building
> management systems of Pachamama House. Seems to me that the world could
> really use an integrated, easy to use and open-source building control
> system (temp & air quality control, keyless entry, power consumption and
> activity monitoring, etc.) I know that I'd need to be in Newy a lot more
> for these to be acheived in any practical timeframe. I've played a little
> with OpenHab, now version 2. It's probably the way to go, but again, advice
> gratefully received.
>
> Greg
>
> On 17/08/2017 8:20 PM, ned haughton wrote:
>
> Building and tuning a CNC machine? :P
> Gus?
>
> On 17/08/17 17:57, Felix Sheldon wrote:
>
> Maybe we could organise a group project?
>
> Wednesday, August 23, 2017
>
> 7:00 PM
>
> Newcastle Makerspace
>
> Rear of 21 Gordon Ave, Hamilton, NSW (edit map)
>
> Group project: It will probably be hard to find something to suit
> everybody, but as long as it's not too expensive or complicated it could be
> just for fun.
>
>
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>
>
> --
> Greg Hall
> 0265 504 481
>
>
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