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Type: Posts; User: daveysapps

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  1. Replies
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    Re: Yet another 3 axis CNC Router Design/Build

    Update


    Ballscrew installed
    https://www.cnczone.com/forums/attachment.php?attachmentid=417470&stc=1

    Side plates and guide rails installed...
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    Re: My DIY CNC machine build mk4

    Awesome work on the machining and fabrication!!!
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    Re: Yet another 3 axis CNC Router Design/Build

    So I am getting ready to install the Y-axis Chinese ball screw under the table ( I am calling my Y-axis the long axis that drives the gantry). I am inspecting screw straightness/run-out prior to...
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    Re: Yet another 3 axis CNC Router Design/Build

    FYI, by no means do I consider myself to be a welder.
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    Re: Yet another 3 axis CNC Router Design/Build

    Project update.

    Welded base
    https://www.cnczone.com/forums/attachment.php?attachmentid=412160&stc=1

    Laser cut sheet metal
    ...
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    Re: Yet another 3 axis CNC Router Design/Build

    To cut down on the number of machined components, the thought is to use a table structure that is known to have a relatively good straightness tolerance ie extruded Al, and skin it with a material...
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    Re: Yet another 3 axis CNC Router Design/Build

    Looking at the specs, I thought that 20mm rails would be adequate.

    Thats x2 on not having a counterbalance for the z... good deal, one less component to design around.

    thanks folks!
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    Re: Yet another 3 axis CNC Router Design/Build

    Update;

    Reduced gantry side plate height by 2.25".
    Designed z axis assembly with supported profile rails (6.5" of travel).

    What are people's thoughts on a counterbalance for the z axis?
    ...
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    Re: Yet another 3 axis CNC Router Design/Build

    millhouse,

    I understand the advantages of the designs that you are suggesting, but I am thinking that the tall gantry plate design will suffice for my needs. Perhaps there will be a second build...
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    Re: Yet another 3 axis CNC Router Design/Build

    Ok, I am thinking that I will start with a single centered ball screw drive for the gantry, but will make provisions to easily add a second ball screw (one on LH side and one on RH side) if the...
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    Re: Yet another 3 axis CNC Router Design/Build

    I am not too concerned about table deflection from the unsupported nature of the design. I did an FEA analysis on the table with a 300lb static load on the center of the table and there was only...
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    Re: Yet another 3 axis CNC Router Design/Build

    I was hoping that with a 35" wide gantry and a bearing block span of 11.88", that I would get minimal racking. Perhaps I should increase the span of the bearing blocks to reduce the likelihood of...
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    Understood, I had a typo. I meant to say faster....

    Understood, I had a typo. I meant to say faster. Thanks
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    1) Good eye on the gantry height, as there is an...

    1) Good eye on the gantry height, as there is an unnesssacary drop between the z axis and the bottom of gantry. I will address this.
    2) I wouldn’t have guessed that the 960 steppers would have been...
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    Yet another 3 axis CNC Router Design/Build

    Well I thought that I would try my hand at building a CNC router, and would like to post my current design status to see if anyone has feedback on my current machine design.

    Specs:
    X axis;
    26"...
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