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  1. #1
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    David A's New 2x3 Bench Top CNC

    Hello,

    This my build thread for a 2x3 desk top which I developed over the last few years. Hope you enjoy it!

    Click image for larger version. 

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ID:	411246

  2. #2
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    Re: David A's New 2x3 Bench Top CNC

    Side frames have shear panels with anchors and carbon fiber reinforced epoxy inside the extrusion slots. They are structurally rigid single pieces.

    Click image for larger version. 

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  3. #3
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    Re: David A's New 2x3 Bench Top CNC

    All holes and access points required for assembly are pre-drilled.

    Click image for larger version. 

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  4. #4
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    Re: David A's New 2x3 Bench Top CNC

    ASSEMBLY OF MACHINE FRAME:

  5. #5
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    Re: David A's New 2x3 Bench Top CNC

    Attach braces to the 3030 cross beam:
    Click image for larger version. 

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    Front cross beam installed:
    Click image for larger version. 

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    Both cross beams installed:
    Click image for larger version. 

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  6. #6
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    Re: David A's New 2x3 Bench Top CNC

    Main frame assembled:
    Click image for larger version. 

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  7. #7
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    Re: David A's New 2x3 Bench Top CNC

    Feet for the machine are 1" HDPE pucks with pressed-in 1" bolts:
    Click image for larger version. 

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    They screw directly into the bottom of the extrusions:
    Click image for larger version. 

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    Feet installed:
    Click image for larger version. 

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  8. #8
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    Re: David A's New 2x3 Bench Top CNC

    BED AND TABLE

    Bed is a 2x3 aluminum sheet and 1515 stringers. All holes for assembly are pre-machined:
    Attachment 411268

    Install stringers:
    Attachment 411270

    Various 1" HDPE parts will be attached to the bed sheet. Spread out an even coat of open gear grease to all the mating surfaces of the HDPE pieces. Make sure all mating surfaces are covered:
    Attachment 411272

    Attachment 411274

    Install the pieces, making sure grease is squeezed out a bit:
    Attachment 411276

    Attachment 411278

  9. #9
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    Re: David A's New 2x3 Bench Top CNC

    Under side of machine bed with HDPE parts installed:
    Click image for larger version. 

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    Click image for larger version. 

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    Top of machine bed with the 1" HDPE table with clamp slots:
    Click image for larger version. 

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  10. #10
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    Re: David A's New 2x3 Bench Top CNC

    Looking good. As with others of this design...how's the side load stiffness?

  11. #11
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    Re: David A's New 2x3 Bench Top CNC

    Thank you fretman_2.

    It feels stout so far. I think the epoxy embedment along the full perimeter of the shear plate makes the side panels quite twist resistant. There are three 3030 cross beams connecting the side panels with large corner brackets. One of them is not visible behind the gantry. See attached pic. So far I didn't see a need for them but larger flat brackets could be added to front and back if necessary.

    Click image for larger version. 

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  12. #12
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    Re: David A's New 2x3 Bench Top CNC

    With the main frame assembled, 20mm linear rails are installed:
    Click image for larger version. 

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    Pretty straight forward:
    Click image for larger version. 

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    Click image for larger version. 

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