torx_drive.scad

//////////////////////////////////////////////////////////////////////
// LibFile: torx_drive.scad
//   Torx driver bits
// Includes:
//   include <BOSL2/std.scad>
//   include <BOSL2/torx_drive.scad>
//////////////////////////////////////////////////////////////////////


// Section: Functions


// Function: torx_outer_diam()
// Description: Get the typical outer diameter of Torx profile.
// Arguments:
//   size = Torx size.
function torx_outer_diam(size) = lookup(size, [
    [  6,  1.75],
    [  8,  2.40],
    [ 10,  2.80],
    [ 15,  3.35],
    [ 20,  3.95],
    [ 25,  4.50],
    [ 30,  5.60],
    [ 40,  6.75],
    [ 45,  7.93],
    [ 50,  8.95],
    [ 55, 11.35],
    [ 60, 13.45],
    [ 70, 15.70],
    [ 80, 17.75],
    [ 90, 20.20],
    [100, 22.40]
]);
 

// Function: torx_inner_diam()
// Description: Get typical inner diameter of Torx profile.
// Arguments:
//   size = Torx size.
function torx_inner_diam(size) = lookup(size, [
    [  6,  1.27],
    [  8,  1.75],
    [ 10,  2.05],
    [ 15,  2.40],
    [ 20,  2.85],
    [ 25,  3.25],
    [ 30,  4.05],
    [ 40,  4.85],
    [ 45,  5.64],
    [ 50,  6.45],
    [ 55,  8.05],
    [ 60,  9.60],
    [ 70, 11.20],
    [ 80, 12.80],
    [ 90, 14.40],
    [100, 16.00]
]);
 

// Function: torx_depth()
// Description: Gets typical drive hole depth.
// Arguments:
//   size = Torx size.
function torx_depth(size) = lookup(size, [
    [  6,  1.82],
    [  8,  3.05],
    [ 10,  3.56],
    [ 15,  3.81],
    [ 20,  4.07],
    [ 25,  4.45],
    [ 30,  4.95],
    [ 40,  5.59],
    [ 45,  6.22],
    [ 50,  6.48],
    [ 55,  6.73],
    [ 60,  8.17],
    [ 70,  8.96],
    [ 80,  9.90],
    [ 90, 10.56],
    [100, 11.35]
]);
 

// Function: torx_tip_radius()
// Description: Gets minor rounding radius of Torx profile.
// Arguments:
//   size = Torx size.
function torx_tip_radius(size) = lookup(size, [
    [  6, 0.132],
    [  8, 0.190],
    [ 10, 0.229],
    [ 15, 0.267],
    [ 20, 0.305],
    [ 25, 0.375],
    [ 30, 0.451],
    [ 40, 0.546],
    [ 45, 0.574],
    [ 50, 0.775],
    [ 55, 0.867],
    [ 60, 1.067],
    [ 70, 1.194],
    [ 80, 1.526],
    [ 90, 1.530],
    [100, 1.720]
]);


// Function: torx_rounding_radius()
// Description: Gets major rounding radius of Torx profile.
// Arguments:
//   size = Torx size.
function torx_rounding_radius(size) = lookup(size, [
    [  6, 0.383],
    [  8, 0.510],
    [ 10, 0.598],
    [ 15, 0.716],
    [ 20, 0.859],
    [ 25, 0.920],
    [ 30, 1.194],
    [ 40, 1.428],
    [ 45, 1.796],
    [ 50, 1.816],
    [ 55, 2.667],
    [ 60, 2.883],
    [ 70, 3.477],
    [ 80, 3.627],
    [ 90, 4.468],
    [100, 4.925]
]);


// Section: Modules


// Module: torx_drive2d()
// Description: Creates a torx bit 2D profile.
// Arguments:
//   size = Torx size.
// Example(2D):
//   torx_drive2d(size=30, $fa=1, $fs=1);
module torx_drive2d(size) {
    od = torx_outer_diam(size);
    id = torx_inner_diam(size);
    tip = torx_tip_radius(size);
    rounding = torx_rounding_radius(size);
    base = od - 2*tip;
    $fn = quantup(segs(od/2),12);
    difference() {
        union() {
            circle(d=base);
            zrot_copies(n=2) {
                hull() {
                    zrot_copies(n=3) {
                        translate([base/2,0,0]) {
                            circle(r=tip, $fn=$fn/2);
                        }
                    }
                }
            }
        }
        zrot_copies(n=6) {
            zrot(180/6) {
                translate([id/2+rounding,0,0]) {
                    circle(r=rounding);
                }
            }
        }
    }
}



// Module: torx_drive()
// Description: Creates a torx bit tip.
// Arguments:
//   size = Torx size.
//   l = Length of bit.
//   center = If true, centers bit vertically.
//   anchor = Translate so anchor point is at origin (0,0,0).  See [anchor](attachments.scad#anchor).  Default: `CENTER`
//   spin = Rotate this many degrees around the Z axis after anchor.  See [spin](attachments.scad#spin).  Default: `0`
//   orient = Vector to rotate top towards, after spin.  See [orient](attachments.scad#orient).  Default: `UP`
// Examples:
//   torx_drive(size=30, l=10, $fa=1, $fs=1);
module torx_drive(size, l=5, center, anchor, spin=0, orient=UP) {
    anchor = get_anchor(anchor, center, BOT, BOT);
    od = torx_outer_diam(size);
    attachable(anchor,spin,orient, d=od, l=l) {
        linear_extrude(height=l, convexity=4, center=true) {
            torx_drive2d(size);
        }
        children();
    }
}



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