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4th axis on a workbee? (possible? has anyone done it?)

Discussion in 'CNC Mills/Routers' started by CartesianPlain, Oct 29, 2020.

  1. CartesianPlain

    Builder

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    Oct 29, 2020
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    Hey everyone,
    first time post here. I've saved up a bit of money and I'm considering buying a workbee kit to add to my shop if I can use it to make certain parts. One of the parts I'm hoping to make are nylon pulleys that a bearing gets pressed into.. very similar to the Open Build's V Wheels actually, but a lot smaller and specific to my application. Please see the attached picture (from Rhino - units in Inches)

    pulley2.jpg

    I see no problems cutting out the profiles (circle with a hole in the centre) and I think the operation for adding the groove on the outside would also be very do-able if I could add a 4th axis on the workbee. I know the blackbox controller is only 3 axis, but since the gantry wouldn't need to move for this operation, couldn't the blackbox Y-axis output be plugged in to the 4th axis?

    Also as a sanity check here, please let me know if I'm not understanding things..

    - The blackbox controller runs "grbl", which listens via USB for g-code commands.
    - Control sends g-code to the blackbox
    - - Other programs can do this as well. (Mach 3, etc.)
    - CAM generates g-code.
    - - I can use any program to generate the g-code, or even write it manually.

    I'll admit to being pretty overwhelmed with how I would ever get software to do this right, but the operation to make the groove seems to be as simple as lowering the right-size ball-nose mill into the edge, and then spinning the 4th axis one revolution.

    Thanks for your time,
    Mike
     

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