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Thread: Set out to built my first CNC router.

  1. #1

    Default Set out to built my first CNC router.

    I was thinking about building my own cnc machine for some years now so some weeks ago I started designing.
    I am building boats at school and at home (raptor canoe) so it has to have some area. My father is going to do harps and I plan to mainly work with wood (boats, modelplanes, furniture and bikes) and XPS for plugs and surfboards.
    Planning on running my Makita700C router before upgrading to a CNC Spindle. Should be enough for some plywood cutting.
    My current design iteration has 1620mm*920mm*145mm working area from 1800mm*1000mm*300mm guide rails.

    Some design inspirations are

    EMS (Möderl/mixware.de) machines. There is also a lot of his design work available on his sites and on the webarchive pages.
    http://www.ems-moederl.de/index.html


    "Frida"
    https://www.google.at/search?q=FRIDA+Fr%C3%A4se&safe=off&espv=2&biw=1600&bih=770&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjpn5qV2rvPAhWBchQKHSgbAPAQ_AUIBigB

    JRHarris
    http://jrharris.co.uk/#section6

    Welschoff's CNC-Wood
    http://ww3.cad.de/foren/ubb/Forum502/HTML/000001.shtml
    http://ww3.cad.de/foren/ubb/uploads/...d/DSCF2706.jpg

    CNC14
    http://www.cnc14.de/

    and Openbuilds OX

    Linear rails
    20mm on Y (2 carriages on each), 20mm on X (one carriage on each rail) and 25 or 30mm on Z (one carriage).

    The Y and X axis will be beltdriven (15mm HTD3M) where the belt is interfacing with a rack. Or belt on belt but it looks as the belts do not interface that great that way.
    I am also here for some advice on Motors and controllers. At first I thought about buying a Longs Motors Set for 200€ (convenient as it ships from a German warehouse) but it is not well matched.
    I guess they stepper motors should have a low impedance (<2mH) and I need a 48V PSU.

    So here are some pictures of the current design.
    http://docdro.id/z1xOSIY (PDF drawing, side view)



    There will be a vertical vise on the front end of the table. Maybe a removable bed or a tilting part like on Frank Howarths cnc (Joe's Hybrid) and the CNC14.

    Here are my previous design iterations
    . The one under the stairs was not a serious idea though concrete side walls would be cool. Initially I wanted to build in wood but aluminium extrusions and T-slots are just too convenient. I also thought about V bearings on steel but why when good linear components are available at good prices.

    I already post on a German speaking forum but the reach of CNC-Zone is much higher and I figure more opinions can't hurt.

    thank you,









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    Last edited by heavyweather; 10-02-2016 at 05:17 PM. Reason: videos made the text unreadable...


  2. #2
    Member awerby's Avatar
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    Default Re: Set out to built my first CNC router.

    That extruded aluminum T-slot material is expensive; there's no particular reason to use it unless you're trying to save weight. For structural parts that don't move, it's a waste of money in my opinion.

    If you're talking about using a long piece of rubber belt as a rack, that's not a great idea. Just get regular steel racks, and use your motors to drive pinions spring-loaded against it.

    A router designed for occasional use in a hand-held application won't work too well, or for very long, as a CNC spindle. I'd say budget for a real spindle and VFD, and keep your Hitachi in its un-destroyed state.

    I'm not sure what that tilted fixture is supposed to do for you. Unless I had a special part that required machining at that angle, I'd wait on that until I really needed it.

    [FONT=Verdana]Andrew Werby[/FONT]
    [URL="http://www.computersculpture.com/"]Website[/URL]


  3. #3

    Default Re: Set out to built my first CNC router.

    The extruded Aluminum material is just easier to assemble. Otherwise I'd have to drill and tap a lot. What material would you suggest for the sides and the gantry?

    I want to try the belt. It is used on the RAW CNC, the CNC14 and on the stainless OX in a double belt variant where the lower belt is glued down. There are also fast industrial servo drives that use timing belts.
    the belts are reinforced timing belts and pretty rigid. I also use a belt drive (gates drive) on one if my bicycles.
    Building CNC machines | Raw CNC



    Here's another belt machine


    Here is another one where you can see the belts reinforcement at the end where it is cut.


    A lot quieter than steel racks.

    I'll go with the spindle or at least a Kress motor.

    The vertical vise is to machine longer pieces for furniture or edges of deeper pieces that you would otherwise need a horizontal spindle.

    Last edited by heavyweather; 10-02-2016 at 06:26 PM.


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    Default Re: Set out to built my first CNC router.

    The belts look interesting, and no doubt they are fast, but with a big gantry like that it seems like a lot of momentum for belts, is the flex in the belts and issue, both with movements and pressure from the spindle?



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Set out to built my first CNC router.

Set out to built my first CNC router.