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rctgantries

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    Roller Coaster Milled Machines

    Scratch / Landing page for the roller-bearings and 2d-sheet-stock axis system.

    With RCT, we break axis into individual kinematic elements - and roll those elements into machine designs.

    gantries

    A reasonable system for beginners, and easy to manufacture (with another CNC mill). Particularely, this system begets the Madison Park Vocational Machine

    mill

    CAD

    Available Here: https://a360.co/2qQf6wf

    password is rollercoaster

    The gantry is built with a set of 'kinematic elements' - a Motor / Pulley Unit, Lateral (into the gantry) and Cross (across the gantry) supports:

    bits

    These can be jimmied around to make a full set of constraints:

    more bits

    And combined into a complete gantry:

    comb

    Here's the back of that:

    allup

    Kinematic Bits

    Currently the set assumes 3/8" HDPE, 8x22x7mm bearings, NEMA23 Motors and 9mm Wide GT2 Belts

    Version for 1/4" HDPE, 5x11x4mm bearings, NEMA17 Motors and 6mm Wide GT2 Belts.

    See cad/assembly/elements/ for kinematic elements, and cad/assembly for one-machine made with these elements.

    Motor and XY Constraint:

    motor

    XY Constraints, with preload adjusting and without:

    xy-adjust

    xy

    YZ Constraints ('out of plane'):

    yz

    Assembling in Rhino

    basically

    or

    units xz

    filling in

    one

    two

    three

    four

    Hardware Notes

    CAM

    • write down settings from fusion, all is good for full cut but go to 12.7krpm
    • do 1st pass at holes, screw down from there. no tabs then ... much happier joints
    • don't forget bushing in 3dp set

    Some Simulation

    It occured to me in class today (Rob Hart fabricated the below component!) that the two-bar flexure I had intended was acting much more like a one-link flexure. Whoops, all well. Still does its job. Here's an image of that in any case:

    onebar

    ooooh

    milling

    BOM

    Machine

    Spindle

    ER16-C12-L100 Collet Holder (confirm?)

    2x 6001-2RS Bearings (confirm?)

    GT2 Pulley 5mm Bore 20T GT2 Pulley 12mm Bore 40T GT2 Belt 75T 150L (confirm?)

    4x SHCS M3x10 1x SHCS M3x20 4x M3 Washer 1x M3 Locknut 3x FHCS M2.5x8

    3DP: Parts!