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Added thread_helix() with tapered thread ends and PCO1881 threadings.
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Revar Desmera
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1 changed files with 131 additions and 1 deletions
132
threading.scad
132
threading.scad
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@ -38,7 +38,58 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Section: Generic Trapezoidal Threading
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// Section: Generic Threading
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// Module: thread_helix()
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// Usage:
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// thread_helix(base_d, pitch, thread_depth, thread_angle, twist, [profile], [left_handed], [higbee], [interior], [orient], [anchor]);
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// Description:
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// Creates a helical thread with optional end tapering.
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// Arguments:
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// base_d = Inside base diameter of threads.
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// pitch = Distance between threads.
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// thread_depth = Depth of threads from top to bottom.
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// thread_angle = Angle of the thread faces.
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// twist = Number of degrees to rotate thread around.
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// profile = If a an asymmetrical thread profile is needed, it can be specified here.
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// left_handed = If true, thread has a left-handed winding.
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// higbee = Angle to taper thread ends by.
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// interior = If true, invert threads for interior threading.
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// orient = Orientation of the threads. Use the `ORIENT_` constants from `constants.scad`. Default: `ORIENT_Z`.
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// anchor = Alignment of the threads. Use the constants from `constants.scad`. Default: `CENTER`.
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module thread_helix(base_d, pitch, thread_depth=undef, thread_angle=15, twist=720, profile=undef, left_handed=false, higbee=60, interior=false, orient=ORIENT_Z, anchor=CENTER)
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{
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h = pitch*twist/360;
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r = base_d/2;
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dz = thread_depth/pitch * tan(thread_angle);
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cap = (1 - 2*dz)/2;
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profile = !is_undef(profile)? profile : (
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interior? [
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[thread_depth/pitch, -cap/2-dz],
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[0, -cap/2],
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[0, +cap/2],
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[thread_depth/pitch, +cap/2+dz],
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] : [
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[0, +cap/2+dz],
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[thread_depth/pitch, +cap/2],
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[thread_depth/pitch, -cap/2],
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[0, -cap/2-dz],
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]
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);
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pline = scale_points(profile, [1,1,1]*pitch);
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dir = left_handed? -1 : 1;
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idir = interior? -1 : 1;
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orient_and_anchor([2*r, 2*r, h], orient, anchor, chain=true) {
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difference() {
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extrude_2dpath_along_spiral(pline, h=h, r=base_d/2, twist=twist*dir, $fn=segs(base_d/2), anchor=CENTER);
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down(h/2) right(r) right(interior? thread_depth : 0) zrot(higbee*dir*idir) fwd(dir*pitch/2) cube([3*thread_depth/cos(higbee), pitch, pitch], center=true);
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up(h/2) zrot(twist*dir) right(r) right(interior? thread_depth : 0) zrot(-higbee*dir*idir) back(dir*pitch/2) cube([3*thread_depth/cos(higbee), pitch, pitch], center=true);
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}
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children();
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}
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}
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// Module: trapezoidal_threaded_rod()
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// Description:
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@ -763,5 +814,84 @@ module square_threaded_nut(
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}
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// Section: PCO-1881 Bottle Threading
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// Module: pco1881_neck()
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// Usage:
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// pco1881_neck()
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// Description:
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// Creates an approximation of a standard PCO-1881 threaded beverage bottle neck.
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// Arguments:
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// wall = Wall thickness in mm.
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// Example:
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// pco1881_neck();
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module pco1881_neck(wall=2)
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{
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$fn = segs(33/2);
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difference() {
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union() {
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difference() {
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union() {
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down(5) cylinder(d=24.20, h=17+5, anchor=BOTTOM);
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// Tamper-proof retaining ring
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cylinder(d=25.70, h=5.81, anchor=BOTTOM);
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up(5.8) cylinder(d=28.0, h=0.59, anchor=BOTTOM);
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up(5.8+0.589) cylinder(d1=28.0, d2=24.2, h=1.9, anchor=BOTTOM);
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}
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// Fillet above support ridge
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up(3) rotate_extrude(convexity=4) {
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right(13.46) circle(r=1.08, $fn=16);
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}
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}
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// Threads
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up(17-1.7)
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thread_helix(
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base_d=24.2,
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pitch=2.7,
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thread_depth=1.6,
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thread_angle=15,
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twist=650,
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higbee=60,
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anchor=TOP
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);
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// Support Ledge
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cylinder(d=33, h=1.16, anchor=BOTTOM);
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up(1.159) cylinder(d1=33, d2=25.7, h=0.979, anchor=BOTTOM);
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// Top brim
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up(17) cyl(d=24.94, h=1.5, rounding2=0.58, anchor=TOP);
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up(17-1) cyl(d=25.07, h=0.7, anchor=TOP);
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up(17-1.7) rounding_hole_mask(d=24.2, rounding=0.3, overage=0.01);
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}
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// Neck hole
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down(5.01) cylinder(d=24.2-2*wall, h=17.02+5, anchor=BOTTOM);
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}
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}
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// Module: pco1881_cap()
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// Usage:
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// pco1881_cap(wall);
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// Description:
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// Creates a basic cap for a PCO1881 threaded beverage bottle.
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// Arguments:
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// wall = Wall thickness in mm.
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// Example:
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// pco1881_cap();
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module pco1881_cap(wall=2)
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{
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$fn = segs(33/2);
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tube(id=28.58, wall=wall, h=11.2+wall, anchor=BOTTOM);
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cylinder(d=28.58+wall, h=wall, anchor=BOTTOM);
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up(wall+2) thread_helix(base_d=25.5, pitch=2.7, thread_depth=1.6, thread_angle=15, twist=650, higbee=45, interior=true, anchor=BOTTOM);
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}
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// vim: noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap
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