The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

The New Hotness

  • Injured Arm Support Table: Wide Version

    This table must sit across the threshold of a walk-in / sit-down shower, with the shower curtain draped across the table to keep the water inside.

    Starting with another patio side table, as before, I installed a quartet of 5 mm stainless screws to lock the top panels in place and convert the table into a rigid assembly:

    Arm Supports - wide table - overview
    Arm Supports – wide table – overview

    Because the shower floor is slightly higher than the bathroom floor, I conjured a set of foot pads to raise the outside legs:

    Patio Side Table Feet - OpenSCAD model
    Patio Side Table Feet – OpenSCAD model

    The sloping top surface on the pads compensates for the angle on the end of the table legs:

    Arm Supports - leg end angle
    Arm Supports – leg end angle

    I think the leg mold produces legs for several different tables, with the end angle being Close Enough™ for most purposes. Most likely, it’d wear flat in a matter of days on an actual patio.

    Using good 3M outdoor-rated foam tape should eliminate the need for fiddly screw holes and more hardware:

    Arm Supports - leg pads
    Arm Supports – leg pads

    The feet fit reasonably well:

    Arm Supports - leg pad in place
    Arm Supports – leg pad in place

    They may need nonskid tape on those flat bottoms, but that’s in the nature of fine tuning.

    And, as with the narrow table, it may need foam blocks to raise the top surface to arm level. Perhaps a pair of Yoga Blocks will come in handy for large adjustments.

    The OpenSCAD source code as a GitHub Gist:

    // Patio Side Table Feet
    // Ed Nisley – KE4ZNU
    // 2019-03
    /* [Layout Options] */
    Layout = "Build"; // [Show,Build]
    /* [Extrusion Parameters] */
    ThreadWidth = 0.40;
    ThreadThick = 0.25;
    HoleWindage = 0.2;
    Protrusion = 0.1;
    //—–
    // Dimensions
    TapeThick = 1.0; // 3M double-stick outdoor tape
    LegWall = [2.5,3.5]; // leg walls are not the same in X and Y!
    LegBase = [36.0,19.0]; // flat on floor
    LegOuter = [31.0,19.0]; // perpendicular to leg axis
    LegInner = [28.5,11.5]; // … ditto
    LegAngle = 90 – 53; // vertical to leg
    LegRecess = [LegInner.x,LegInner.y,LegInner.x*tan(LegAngle)];
    PadWedge = 2; // to fit end of leg
    PadRadius = 4.0; // rounding radius for nice corners
    PadBase = [LegBase.x + 2*PadRadius,LegBase.y + 2*PadRadius,5.0];
    PadSides = 6*4;
    BathStep = 20; // offset between shower bottom and floor
    /* [Hidden] */
    EmbossDepth = 1*ThreadThick; // recess depth
    DebossHeight = 1*ThreadThick + Protrusion; // text height + Protrusion into part
    //—–
    // Useful routines
    function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
    module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
    Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
    FixDia = Dia / cos(180/Sides);
    cylinder(r=(FixDia + HoleWindage)/2,
    h=Height,
    $fn=Sides);
    }
    //—–
    // Foot pad
    module FootPad(Riser = 0.0) {
    difference() {
    union() {
    hull()
    for (i=[-1,1], j=[-1,1]) {
    translate([i*(PadBase.x/2 – PadRadius),j*(PadBase.y/2 – PadRadius),0])
    cylinder(r=PadRadius,h=1,$fn=PadSides);
    translate([i*(PadBase.x/2 – PadRadius),
    j*(PadBase.y/2 – PadRadius),
    Riser + PadBase.z – PadRadius – (i-1)*PadWedge/2])
    sphere(r=PadRadius/cos(180/PadSides),$fn=PadSides);
    }
    translate([PadRadius – PadBase.x/2,0,Riser + PadBase.z])
    rotate([0,LegAngle,0])
    translate([LegRecess.x/2,0,(LegRecess.z – Protrusion)/2 ])
    cube(LegRecess – [2*TapeThick,0,2*TapeThick],center=true);
    }
    translate([0,0,-2*PadBase.z]) // remove anything under Z=0
    cube(4*PadBase,center=true);
    cube([17,12,2*DebossHeight],center=true);
    }
    mirror([1,0,0])
    linear_extrude(height=EmbossDepth)
    translate([0,0,0])
    text(text=str(Riser),size=10,spacing=1.05,
    font="Arial:style=Bold",
    valign="center",halign="center");
    }
    //—–
    // Build things
    if (Layout == "Build") {
    if (true) {
    translate([-0.7*PadBase.x,-0.7*PadBase.y,0])
    FootPad(0);
    translate([-0.7*PadBase.x,+0.7*PadBase.y,0])
    FootPad(0);
    }
    translate([+0.7*PadBase.x,-0.7*PadBase.y,0])
    FootPad(BathStep);
    translate([+0.7*PadBase.x,+0.7*PadBase.y,0])
    FootPad(BathStep);
    }
    if (Layout == "Show")
    FootPad();