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Enable taper and better higbee in thread_helix()

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Garth Minette 2021-01-31 15:43:50 -08:00
parent 0a6b899404
commit cc4e4ff402
4 changed files with 95 additions and 79 deletions
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12
bottlecaps.scad
View file

@ -110,12 +110,12 @@ module pco1810_neck(wall=2, anchor="support-ring", spin=0, orient=UP)
bottom_half() { bottom_half() {
difference() { difference() {
thread_helix( thread_helix(
base_d=threadbase_d-0.1, d=threadbase_d-0.1,
pitch=thread_pitch, pitch=thread_pitch,
thread_depth=thread_h+0.1, thread_depth=thread_h+0.1,
thread_angle=thread_angle, thread_angle=thread_angle,
twist=810, twist=810,
higbee=75, higbee=thread_h*2,
anchor=TOP anchor=TOP
); );
zrot_copies(rots=[90,270]) { zrot_copies(rots=[90,270]) {
@ -192,7 +192,7 @@ module pco1810_cap(wall=2, texture="none", anchor=BOTTOM, spin=0, orient=UP)
} }
up(wall) cyl(d=cap_id, h=tamper_ring_h+wall, anchor=BOTTOM); up(wall) cyl(d=cap_id, h=tamper_ring_h+wall, anchor=BOTTOM);
} }
up(wall+2) thread_helix(base_d=thread_od-thread_depth*2, pitch=thread_pitch, thread_depth=thread_depth, thread_angle=thread_angle, twist=810, higbee=45, internal=true, anchor=BOTTOM); up(wall+2) thread_helix(d=thread_od-thread_depth*2, pitch=thread_pitch, thread_depth=thread_depth, thread_angle=thread_angle, twist=810, higbee=thread_depth, internal=true, anchor=BOTTOM);
} }
children(); children();
} }
@ -303,12 +303,12 @@ module pco1881_neck(wall=2, anchor="support-ring", spin=0, orient=UP)
up(h-lip_h) { up(h-lip_h) {
difference() { difference() {
thread_helix( thread_helix(
base_d=threadbase_d-0.1, d=threadbase_d-0.1,
pitch=thread_pitch, pitch=thread_pitch,
thread_depth=thread_h+0.1, thread_depth=thread_h+0.1,
thread_angle=thread_angle, thread_angle=thread_angle,
twist=650, twist=650,
higbee=75, higbee=thread_h*2,
anchor=TOP anchor=TOP
); );
zrot_copies(rots=[90,270]) { zrot_copies(rots=[90,270]) {
@ -376,7 +376,7 @@ module pco1881_cap(wall=2, texture="none", anchor=BOTTOM, spin=0, orient=UP)
} }
up(wall) cyl(d=28.58, h=11.2+wall, anchor=BOTTOM); up(wall) cyl(d=28.58, h=11.2+wall, anchor=BOTTOM);
} }
up(wall+2) thread_helix(base_d=25.5, pitch=2.7, thread_depth=1.6, thread_angle=15, twist=650, higbee=45, internal=true, anchor=BOTTOM); up(wall+2) thread_helix(d=25.5, pitch=2.7, thread_depth=1.6, thread_angle=15, twist=650, higbee=1.6, internal=true, anchor=BOTTOM);
} }
children(); children();
} }

87
paths.scad
View file

@ -950,14 +950,16 @@ module extrude_from_to(pt1, pt2, convexity, twist, scale, slices) {
// Module: spiral_sweep() // Module: spiral_sweep()
// Description: // Description:
// Takes a closed 2D polygon path, centered on the XY plane, and sweeps/extrudes it along a 3D spiral path // Takes a closed 2D polygon path, centered on the XY plane, and sweeps/extrudes it along a 3D spiral path.
// of a given radius, height and twist. // of a given radius, height and twist.
// Arguments: // Arguments:
// path = Array of points of a polygon path, to be extruded. // poly = Array of points of a polygon path, to be extruded.
// h = height of the spiral to extrude along. // h = height of the spiral to extrude along.
// r = Radius of the spiral to extrude along. Default: 50 // r = Radius of the spiral to extrude along. Default: 50
// d = Diameter of the spiral to extrude along.
// twist = number of degrees of rotation to spiral up along height. // twist = number of degrees of rotation to spiral up along height.
// ---
// d = Diameter of the spiral to extrude along.
// higbee = Length to taper thread ends over.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER` // 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` // 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` // orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
@ -965,50 +967,57 @@ module extrude_from_to(pt1, pt2, convexity, twist, scale, slices) {
// Example: // Example:
// poly = [[-10,0], [-3,-5], [3,-5], [10,0], [0,-30]]; // poly = [[-10,0], [-3,-5], [3,-5], [10,0], [0,-30]];
// spiral_sweep(poly, h=200, r=50, twist=1080, $fn=36); // spiral_sweep(poly, h=200, r=50, twist=1080, $fn=36);
module spiral_sweep(poly, h, r, twist=360, center, d, anchor, spin=0, orient=UP) { module spiral_sweep(poly, h, r, twist=360, higbee, center, r1, r2, d, d1, d2, higbee1, higbee2, anchor, spin=0, orient=UP) {
r = get_radius(r=r, d=d, dflt=50);
poly = path3d(poly); poly = path3d(poly);
pline_count = len(poly);
steps = ceil(segs(r)*(twist/360));
anchor = get_anchor(anchor,center,BOT,BOT); anchor = get_anchor(anchor,center,BOT,BOT);
r1 = get_radius(r1=r1, r=r, d1=d1, d=d, dflt=50);
r2 = get_radius(r1=r2, r=r, d1=d2, d=d, dflt=50);
sides = segs(max(r1,r2));
steps = ceil(sides*(twist/360));
higbee1 = first_defined([higbee1, higbee, 0]);
higbee2 = first_defined([higbee2, higbee, 0]);
higang1 = 360 * higbee1 / (2 * r1 * PI);
higang2 = 360 * higbee2 / (2 * r2 * PI);
higsteps1 = ceil(higang1/360*sides);
higsteps2 = ceil(higang2/360*sides);
assert(higang1 < twist/2);
assert(higang2 < twist/2);
poly_points = [ function higsize(a) = lookup(a,[
for ( [-0.001, 0],
p = [0:1:steps] for (x=[0.125:0.125:1]) [ x*higang1, pow(x,1/2)],
) let ( for (x=[0.125:0.125:1]) [twist-x*higang2, pow(x,1/2)],
a = twist * (p/steps), [twist+0.001, 0]
dx = r*cos(a), ]);
dy = r*sin(a),
dz = h * (p/steps), us = [
mat = affine3d_translate([dx, dy, dz-h/2]) * for (i=[0:higsteps1/10:higsteps1]) i,
affine3d_zrot(a) * for (i=[higsteps1+1:1:steps-higsteps2-1]) i,
affine3d_xrot(90), for (i=[steps-higsteps2:higsteps2/10:steps]) i,
];
zang = atan2(r2-r1,h);
points = [
for (p = us) let (
u = p / steps,
a = twist * u,
hsc = higsize(a),
r = lerp(r1,r2,u),
mat = affine3d_zrot(a) *
affine3d_translate([r, 0, h * (u-0.5)]) *
affine3d_xrot(90) *
affine3d_skew_xz(xa=zang) *
affine3d_scale([hsc,lerp(hsc,1,0.25),1]),
pts = apply(mat, poly) pts = apply(mat, poly)
) for (pt = pts) pt ) pts
]; ];
poly_faces = concat( vnf = vnf_vertex_array(
[[for (b = [0:1:pline_count-1]) b]], points, col_wrap=true, caps=true,
[ style=(abs(higbee1)+abs(higbee2))>0? "quincunx" : "alt"
for (
p = [0:1:steps-1],
b = [0:1:pline_count-1],
i = [0:1]
) let (
b2 = (b == pline_count-1)? 0 : b+1,
p0 = p * pline_count + b,
p1 = p * pline_count + b2,
p2 = (p+1) * pline_count + b2,
p3 = (p+1) * pline_count + b,
pt = (i==0)? [p0, p2, p1] : [p0, p3, p2]
) pt
],
[[for (b = [pline_count-1:-1:0]) b+(steps)*pline_count]]
); );
tri_faces = triangulate_faces(poly_points, poly_faces); attachable(anchor,spin,orient, r1=r1, r2=r2, l=h) {
attachable(anchor,spin,orient, r=r, l=h) { vnf_polyhedron(vnf, convexity=2*twist/360);
polyhedron(points=poly_points, faces=tri_faces, convexity=10);
children(); children();
} }
} }

73
threading.scad
View file

@ -11,19 +11,24 @@
// Module: thread_helix() // Module: thread_helix()
// Usage: // Usage:
// thread_helix(base_d, pitch, thread_depth, thread_angle, twist, [profile], [left_handed], [higbee], [internal]); // thread_helix(d, pitch, thread_depth, <thread_angle>, <twist>, <profile=>, <left_handed=>, <higbee=>, <internal=>);
// Description: // Description:
// Creates a helical thread with optional end tapering. // Creates a helical thread with optional end tapering.
// Arguments: // Arguments:
// base_d = Inside base diameter of threads. // d = Inside base diameter of threads. Default: 10
// pitch = Distance between threads. // pitch = Distance between threads. Default: 2mm/thread
// thread_depth = Depth of threads from top to bottom. // thread_depth = Depth of threads from top to bottom.
// thread_angle = Angle of the thread faces. // thread_angle = Angle of the thread faces. Default: 15 degrees.
// twist = Number of degrees to rotate thread around. // twist = Number of degrees to rotate thread around. Default: 720 degrees.
// profile = If a an asymmetrical thread profile is needed, it can be specified here. // ---
// profile = If an asymmetrical thread profile is needed, it can be specified here.
// left_handed = If true, thread has a left-handed winding. // left_handed = If true, thread has a left-handed winding.
// higbee = Angle to taper thread ends by.
// internal = If true, invert threads for internal threading. // internal = If true, invert threads for internal threading.
// d1 = Bottom inside base diameter of threads.
// d2 = Top inside base diameter of threads.
// higbee = Length to taper thread ends over. Default: 0
// higbee1 = Length to taper bottom thread end over.
// higbee2 = Length to taper top thread end over.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER` // 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` // 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` // orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
@ -31,42 +36,44 @@
// pitch = 2; // pitch = 2;
// depth = pitch * cos(30) * 5/8; // depth = pitch * cos(30) * 5/8;
// profile = [ // profile = [
// [-7/16, -depth/pitch*1.07], // [-6/16, 0 ],
// [-6/16, -depth/pitch], // [-1/16, depth/pitch ],
// [-1/16, 0], // [ 1/16, depth/pitch ],
// [ 1/16, 0], // [ 6/16, 0 ],
// [ 6/16, -depth/pitch],
// [ 7/16, -depth/pitch*1.07]
// ]; // ];
// stroke(profile, width=0.02); // stroke(profile, width=0.02);
module thread_helix(base_d, pitch, thread_depth=undef, thread_angle=15, twist=720, profile=undef, left_handed=false, higbee=60, internal=false, anchor=CENTER, spin=0, orient=UP) // Example:
{ // thread_helix(d=10, pitch=2, thread_depth=0.75, thread_angle=15, twist=900, $fn=72);
module thread_helix(
d, pitch=2, thread_depth, thread_angle=15, twist=720,
profile, left_handed=false, internal=false,
d1, d2, higbee, higbee1, higbee2,
anchor=CENTER, spin=0, orient=UP
) {
h = pitch*twist/360; h = pitch*twist/360;
r = base_d/2; r1 = get_radius(d1=d1, d=d, dflt=10);
dz = thread_depth/pitch * tan(thread_angle); r2 = get_radius(d1=d2, d=d, dflt=10);
tdp = thread_depth / pitch;
dz = tdp * tan(thread_angle);
cap = (1 - 2*dz)/2; cap = (1 - 2*dz)/2;
profile = !is_undef(profile)? profile : ( profile = !is_undef(profile)? profile : (
internal? [ internal? [
[thread_depth/pitch, -cap/2-dz], [-cap/2-dz, tdp],
[0, -cap/2], [-cap/2, 0 ],
[0, +cap/2], [+cap/2, 0 ],
[thread_depth/pitch, +cap/2+dz], [+cap/2+dz, tdp],
] : [ ] : [
[0, +cap/2+dz], [+cap/2+dz, 0 ],
[thread_depth/pitch, +cap/2], [+cap/2, tdp],
[thread_depth/pitch, -cap/2], [-cap/2, tdp],
[0, -cap/2-dz], [-cap/2-dz, 0 ],
] ]
); );
pline = profile * pitch; pline = mirror([-1,1], p = profile * pitch);
dir = left_handed? -1 : 1; dir = left_handed? -1 : 1;
idir = internal? -1 : 1; idir = internal? -1 : 1;
attachable(anchor,spin,orient, r=r, l=h) { attachable(anchor,spin,orient, r1=r1, r2=r2, l=h) {
difference() { spiral_sweep(pline, h=h, r1=r1, r2=r2, twist=twist*dir, higbee=higbee, higbee1=higbee1, higbee2=higbee2, anchor=CENTER);
spiral_sweep(pline, h=h, r=base_d/2, twist=twist*dir, $fn=segs(base_d/2), anchor=CENTER);
down(h/2) right(r) right(internal? thread_depth : 0) zrot(higbee*dir*idir) fwd(dir*pitch/2) cube([3*thread_depth/cos(higbee), pitch, pitch], center=true);
up(h/2) zrot(twist*dir) right(r) right(internal? thread_depth : 0) zrot(-higbee*dir*idir) back(dir*pitch/2) cube([3*thread_depth/cos(higbee), pitch, pitch], center=true);
}
children(); children();
} }
} }
@ -133,7 +140,7 @@ module trapezoidal_threaded_rod(
left_handed=false, left_handed=false,
bevel=false, bevel=false,
starts=1, starts=1,
profile=undef, profile,
internal=false, internal=false,
center, anchor, spin=0, orient=UP center, anchor, spin=0, orient=UP
) { ) {

2
version.scad
View file

@ -6,7 +6,7 @@
////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////
BOSL_VERSION = [2,0,551]; BOSL_VERSION = [2,0,552];
// Section: BOSL Library Version Functions // Section: BOSL Library Version Functions