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  1. #1
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    30x30" open source CNC machine design

    Sienci Labs - Simple and Affordable Desktop CNC Milling
    Has a new open source shapeoko / xcarve type machine using inexpensive aluminum angle profiles.
    One can get all the x and z axis laser cut steel plates on line at https://www.2twentytwosteel.com/ for about $125
    3d parts can be printed at home using abs or petg
    aluminum angle can be bought online or locally
    and all the wheels, threaded rod, etc can be bought at Bulk-Man 3D – Online Store
    They are selling them for $1300, but I think one can get them made for around $600 to $700 not including labor.
    everything is well documented on their onshape model and any part can be downloaded easily.

    I've never made an x/y cnc machine before would this be a good starter project?

  2. #2
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    Re: 30x30" open source CNC machine design

    That machine looks like it has serious flex issues. Especially on the X-axis beam. If you want to get into CNC cheap, look at the CBeam machines like the workbee. Still has some flex but more substantial looking than the Scienci frame.

  3. #3
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    Re: 30x30" open source CNC machine design

    Quote Originally Posted by aluminumwelder View Post
    Sienci Labs - Simple and Affordable Desktop CNC Milling
    Has a new open source shapeoko / xcarve type machine using inexpensive aluminum angle profiles.
    One can get all the x and z axis laser cut steel plates on line at https://www.2twentytwosteel.com/ for about $125
    3d parts can be printed at home using abs or petg
    aluminum angle can be bought online or locally
    and all the wheels, threaded rod, etc can be bought at Bulk-Man 3D – Online Store
    They are selling them for $1300, but I think one can get them made for around $600 to $700 not including labor.
    everything is well documented on their onshape model and any part can be downloaded easily.

    I've never made an x/y cnc machine before would this be a good starter project?
    No not a good starter project

    These machines are worse than buying a Chinese machine V-roller slides for machines like this are history
    Mactec54

  4. #4
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    Re: 30x30" open source CNC machine design

    Why... ???

    T-slot aluminum (2020, 3030, etc) and associated hardware (connectors, etc) is readily available, and not very expensive, and a lot stiffer?

  5. #5
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    Re: 30x30" open source CNC machine design

    https://www.youtube.com/watch?v=B27nUN1ejIQ
    machine does not have much flex at all. Its' not even been delivered yet so bit premature to judge how good it is?

  6. #6
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    Re: 30x30" open source CNC machine design

    Because even when you buy direct from China a complete machine is $1200 usd shipped. That $1200 price includes a $363 air cooled spindle though so more like $937 usd total without spindle. I can make this for about $600 so saving a few hundred . https://bulkman3d.com/product/wbf/

  7. #7
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    Re: 30x30" open source CNC machine design

    the X beam initially did have too much deflection so they doubled it up two angles back to back. Personally I might try just using steel angle that has the end of each leg milled down to give it a square profile. You tube video shows very little deflection.

    I am surprised no has has come up with an aluminum external profile that can accomodate a steel tube epoxied into the inside to give it more rigidity. Steel is about 3x stronger than most aluminums.

  8. #8
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    Re: 30x30" open source CNC machine design

    Quote Originally Posted by aluminumwelder View Post
    the X beam initially did have too much deflection so they doubled it up two angles back to back. Personally I might try just using steel angle that has the end of each leg milled down to give it a square profile. You tube video shows very little deflection.

    I am surprised no has has come up with an aluminum external profile that can accomodate a steel tube epoxied into the inside to give it more rigidity. Steel is about 3x stronger than most aluminums.
    You obvious did not know what you are looking at the deflection is a massive amount for that small force 0.010" @ 3Kg, the max it should be is .0005" which would be 1/2 of one of those divisions on the dial which would be .0005" above this number and you are wasting your time

    There are plenty of people that has added strength to aluminum profile after the fact, the deflection you are seeing in this video is not the aluminum extrusion that is flexing it is the Z axes V-Bearing slide the aluminum extrusion flex is going to happen when you start cutting which will add to this flexing of each axes, even if you are just cutting wood you will see this in the cut
    Mactec54

  9. #9
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    Re: 30x30" open source CNC machine design

    sorry your assumptions are incorrect. The z axis does not use Vbearing slides it using linear bearings. And if your material is pine wood and depth of cut is only .062" then 3kg is adequate, heck it might be adequate for 1/4 Depth of Cut. the fact that you do not give material or depth of cut specifications with your above assumptions makes it looks like you work for a competitor trying to bad mount the competition.. IMHO.

  10. #10
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    Re: 30x30" open source CNC machine design

    "There are plenty of people that has added strength to aluminum profile after the fact" and everone I have seen is a slow painful process. the aluminum extrusions should be made to easily epoxy a standard steel extrusion into it taking about 30 to 60 seconds to do.

  11. #11
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    Re: 30x30" open source CNC machine design

    It sounds like you are already sold on the design. You should go for it instead of arguing the points. Then report back what you learned.

  12. #12
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    Re: 30x30" open source CNC machine design

    sorry did not mean to sound defensive. Still trying to figgure out how good these V wheels are and if adding 8 per rail would help vs the only 4 per rail they have now?
    Also would ball screws be a significant upgrade?

    This will be a hobby machine, cutting mostly softwoods and some hard ones.

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