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https://github.com/BelfrySCAD/BOSL2.git
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Added npt_threaded_rod()
This commit is contained in:
Garth Minette
parent
2a51cf271d
commit
0dc5b9c7f2
2 changed files with 158 additions and 53 deletions
209
threading.scad
209
threading.scad
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@ -48,7 +48,7 @@ module thread_helix(
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d, pitch=2, thread_depth, thread_angle=15, twist=720,
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profile, left_handed=false, internal=false,
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d1, d2, higbee, higbee1, higbee2,
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anchor=CENTER, spin=0, orient=UP
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anchor, spin, orient
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) {
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h = pitch*twist/360;
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r1 = get_radius(d1=d1, d=d, dflt=10);
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@ -88,17 +88,24 @@ module thread_helix(
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// For ACME threads, use thread_angle=14.5 and thread_depth=pitch/2.
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// For square threads, use thread_angle=0 and thread_depth=pitch/2.
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// For normal UTS or ISO screw threads, use the `threaded_rod()` module instead to get the correct thread profile.
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// For NPT (National Pipe Threading) threads, use the `npt_threaded_rod() module instead.
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// Arguments:
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// d = Outer diameter of threaded rod.
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// l = Length of threaded rod.
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// pitch = Length between threads.
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// thread_depth = Depth of the threads. Default=pitch/2
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// thread_angle = The pressure angle profile angle of the threads. Default = 14.5 degree ACME profile.
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// ---
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// thread_depth = Depth of the threads. Default=pitch/2
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// left_handed = If true, create left-handed threads. Default = false
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// bevel = if true, bevel the thread ends. Default: true
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// starts = The number of lead starts. Default = 1
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// internal = If true, make this a mask for making internal threads.
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// profile = The shape of a thread, if not a symmetric trapezoidal form. Given as a 2D path, where X is between -1/2 and 1/2, representing the pitch distance, and Y is 0 for the peak, and `-depth/pitch` for the valleys. The segment between the end of one thread profile and the start of the next is automatic, so the start and end coordinates should not both be at the same Y at X = ±1/2. This path is scaled up by the pitch size in both dimensions when making the final threading. This overrides the `thread_angle` and `thread_depth` options.
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// internal = If true, make this a mask for making internal threads.
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// d1 = Bottom outside diameter of threads.
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// d2 = Top outside diameter of threads.
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// higbee = Length to taper thread ends over. Default: 0
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// higbee1 = Length to taper bottom thread end over.
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// higbee2 = Length to taper top thread end over.
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// center = If given, overrides `anchor`. A true value sets `anchor=CENTER`, false sets `anchor=UP`.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
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@ -132,9 +139,7 @@ module thread_helix(
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// ];
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// stroke(profile, width=0.02);
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module trapezoidal_threaded_rod(
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d=10,
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l=100,
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pitch=2,
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d, l=100, pitch=2,
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thread_angle=15,
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thread_depth=undef,
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left_handed=false,
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@ -142,18 +147,42 @@ module trapezoidal_threaded_rod(
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starts=1,
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profile,
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internal=false,
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center, anchor, spin=0, orient=UP
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d1, d2,
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higbee=0, higbee1, higbee2,
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center, anchor, spin, orient
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) {
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function _thread_pt(thread, threads, start, starts, astep, asteps, part, parts) =
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astep + asteps * (thread + threads * (part + parts * start));
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d = internal? (d/cos(180/segs(d/2)) + $slop*3) : d;
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astep = 360 / quantup(segs(d/2), starts);
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_r1 = get_radius(d1=d1, d=d, dflt=10);
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_r2 = get_radius(d1=d2, d=d, dflt=10);
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sides = segs(max(_r1,_r2));
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rsc = internal? (1/cos(180/sides) + $slop*3) : 1;
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astep = 360 / quantup(sides, starts);
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asteps = ceil(360/astep);
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threads = ceil(l/pitch/starts)+(starts<4?4-starts:1);
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depth = min((thread_depth==undef? pitch/2 : thread_depth), pitch/2/tan(thread_angle));
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pa_delta = min(pitch/4-0.01,depth*tan(thread_angle)/2)/pitch;
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dir = left_handed? -1 : 1;
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twist = 360 * l / pitch / starts;
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higbee1 = first_defined([higbee1, higbee, 0]);
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higbee2 = first_defined([higbee2, higbee, 0]);
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higang1 = 360 * higbee1 / (2 * _r1 * PI);
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higang2 = 360 * higbee2 / (2 * _r2 * PI);
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higsteps1 = ceil(higang1/360*sides);
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higsteps2 = ceil(higang2/360*sides);
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assert(higang1 < twist/2);
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assert(higang2 < twist/2);
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higbee_table = [
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[-twist, 0],
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[-twist/2-0.001, 0],
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[-twist/2+higang1, 1],
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[ twist/2-higang2, 1],
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[ twist/2+0.001, 0],
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[ twist, 0]
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];
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r1 = -depth/pitch;
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z1 = 1/4-pa_delta;
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z2 = 1/4+pa_delta;
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@ -172,13 +201,17 @@ module trapezoidal_threaded_rod(
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thread = [0:1:threads-1],
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astep = [0:1:asteps-1]
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) let (
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a = astep / asteps,
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z = (thread + a - threads/2) * starts * pitch,
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u = z / l,
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higsc = higbee1==0 && higbee2==0? 1 :
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let ( tot_ang = (thread+a-threads/2) * 360 )
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lookup(tot_ang, higbee_table),
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ppt = profile[part] * pitch,
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dz = ppt.x,
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r = ppt.y + d/2,
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a = astep / asteps,
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r = lerp(_r1, _r2, u) - depth + higsc*(ppt.y+depth),
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c = cos(360 * (a * dir + start/starts)),
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s = sin(360 * (a * dir + start/starts)),
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z = (thread + a - threads/2) * starts * pitch
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s = sin(360 * (a * dir + start/starts))
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) [r*c, r*s, z+dz]
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],
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[[0, 0, -threads*pitch*starts/2-pitch/4], [0, 0, threads*pitch*starts/2+pitch/4]]
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@ -280,11 +313,11 @@ module trapezoidal_threaded_rod(
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]
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);
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anchor = get_anchor(anchor, center, BOT, CENTER);
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attachable(anchor,spin,orient, d=d, l=l) {
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attachable(anchor,spin,orient, r1=_r1, r2=_r2, l=l) {
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difference() {
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polyhedron(points=poly_points, faces=poly_faces, convexity=threads*starts*2);
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zcopies(l+4*pitch*starts) cube([d+1, d+1, 4*pitch*starts], center=true);
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if (bevel) cylinder_mask(d=d, l=l+0.01, chamfer=depth);
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zcopies(l+4*pitch*starts) cylinder(h=4*pitch*starts, r=2*max(_r1,_r2)+1, center=true);
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if (bevel) cylinder_mask(r1=_r1, r2=_r2, l=l+0.01, chamfer=depth);
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}
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children();
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}
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@ -330,9 +363,7 @@ module trapezoidal_threaded_nut(
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left_handed=false,
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starts=1,
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bevel=true,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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depth = min((thread_depth==undef? pitch/2 : thread_depth), pitch/2/tan(thread_angle));
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attachable(anchor,spin,orient, size=[od/cos(30),od,h]) {
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@ -375,6 +406,11 @@ module trapezoidal_threaded_nut(
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// left_handed = if true, create left-handed threads. Default = false
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// bevel = if true, bevel the thread ends. Default: false
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// internal = If true, make this a mask for making internal threads.
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// d1 = Bottom outside diameter of threads.
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// d2 = Top outside diameter of threads.
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// higbee = Length to taper thread ends over. Default: 0
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// higbee1 = Length to taper bottom thread end over.
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// higbee2 = Length to taper top thread end over.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
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// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
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@ -386,14 +422,16 @@ module trapezoidal_threaded_nut(
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// threaded_rod(d=10, l=20, pitch=1.25, left_handed=true, $fa=1, $fs=1);
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// threaded_rod(d=25, l=20, pitch=2, $fa=1, $fs=1);
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module threaded_rod(
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d=10, l=100, pitch=2,
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d, l=100, pitch=2,
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left_handed=false,
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bevel=false,
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internal=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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d1, d2,
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higbee, higbee1, higbee2,
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anchor, spin, orient
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) {
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_r1 = get_radius(d1=d1, d=d, dflt=10);
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_r2 = get_radius(d1=d2, d=d, dflt=10);
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depth = pitch * cos(30) * 5/8;
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profile = internal? [
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[-6/16, -depth/pitch],
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@ -411,13 +449,17 @@ module threaded_rod(
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[ 7/16, -depth/pitch*1.07]
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];
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trapezoidal_threaded_rod(
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d=d, l=l, pitch=pitch,
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d=d, d1=d1, d2=d2, l=l,
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pitch=pitch,
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thread_depth=depth,
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thread_angle=30,
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profile=profile,
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left_handed=left_handed,
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bevel=bevel,
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internal=internal,
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higbee=higbee,
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higbee1=higbee1,
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higbee2=higbee2,
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anchor=anchor,
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spin=spin,
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orient=orient
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@ -446,7 +488,7 @@ module threaded_rod(
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module threaded_nut(
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od=16, id=10, h=10,
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pitch=2, left_handed=false, bevel=false,
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anchor=CENTER, spin=0, orient=UP
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anchor, spin, orient
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) {
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depth = pitch * cos(30) * 5/8;
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profile = [
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@ -469,6 +511,87 @@ module threaded_nut(
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}
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// Section: Pipe Threading
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// Module: npt_threaded_rod()
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// Description:
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// Constructs a standard NPT pipe threading.
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// Arguments:
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// d = Outer diameter of threaded rod.
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// left_handed = if true, create left-handed threads. Default = false
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// bevel = if true, bevel the thread ends. Default: false
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// internal = If true, make this a mask for making internal threads.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
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// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
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// $slop = The printer-specific slop value to make parts fit just right.
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// Example(2D):
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// projection(cut=true) npt_threaded_rod(size=1/4, orient=BACK);
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// Examples(Med):
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// npt_threaded_rod(size=3/8, $fn=72);
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// npt_threaded_rod(size=1/2, $fn=72);
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// npt_threaded_rod(size=1/2, left_handed=true, $fn=72);
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module npt_threaded_rod(
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size=1/2,
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left_handed=false,
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bevel=false,
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internal=false,
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anchor, spin, orient
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) {
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info_table = [
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// Size OD len TPI
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[ 1/16, [ 0.3896, 0.308, 27 ]],
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[ 1/8, [ 0.3924, 0.401, 27 ]],
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[ 1/4, [ 0.5946, 0.533, 18 ]],
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[ 3/8, [ 0.6006, 0.668, 18 ]],
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[ 1/2, [ 0.7815, 0.832, 14 ]],
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[ 3/4, [ 0.7935, 1.043, 14 ]],
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[ 1, [ 0.9845, 1.305, 11.5]],
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[ 1+1/4, [ 1.0085, 1.649, 11.5]],
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[ 1+1/2, [ 1.0252, 1.888, 11.5]],
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[ 2, [ 1.0582, 2.362, 11.5]],
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];
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info = [for (data=info_table) if(approx(size,data[0])) data[1]][0];
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dummy1 = assert(is_def(info), "Unsupported NPT size. Try one of 1/16, 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1+1/4, 1+1/2, 2");
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l = 25.4 * info[0];
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d = 25.4 * info[1];
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pitch = 25.4 / info[2];
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r1 = get_radius(d=d, dflt=0.84 * 25.4 / 2);
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r2 = r1 - l/32;
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depth = pitch * cos(30) * 5/8;
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profile = internal? [
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[-6/16, -depth/pitch],
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[-1/16, 0],
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[-1/32, 0.02],
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[ 1/32, 0.02],
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[ 1/16, 0],
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[ 6/16, -depth/pitch]
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] : [
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[-7/16, -depth/pitch*1.07],
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[-6/16, -depth/pitch],
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[-1/16, 0],
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[ 1/16, 0],
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[ 6/16, -depth/pitch],
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[ 7/16, -depth/pitch*1.07]
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];
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trapezoidal_threaded_rod(
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d1=2*r1, d2=2*r2, l=l,
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pitch=pitch,
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thread_depth=depth,
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thread_angle=30,
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profile=profile,
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left_handed=left_handed,
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bevel=bevel,
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internal=internal,
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higbee=r1*PI/2,
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anchor=anchor,
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spin=spin,
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orient=orient
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) children();
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}
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// Section: Buttress Threading
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// Module: buttress_threaded_rod()
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@ -497,9 +620,7 @@ module buttress_threaded_rod(
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left_handed=false,
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bevel=false,
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internal=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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depth = pitch * 3/4;
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profile = [
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@ -546,9 +667,7 @@ module buttress_threaded_nut(
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od=16, id=10, h=10,
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pitch=2, left_handed=false,
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bevel=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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depth = pitch * 3/4;
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profile = [
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@ -600,9 +719,7 @@ module metric_trapezoidal_threaded_rod(
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starts=1,
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bevel=false,
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internal=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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trapezoidal_threaded_rod(
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d=d, l=l,
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@ -644,9 +761,7 @@ module metric_trapezoidal_threaded_nut(
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starts=1,
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left_handed=false,
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bevel=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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trapezoidal_threaded_nut(
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od=od, id=id, h=h,
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@ -695,9 +810,7 @@ module acme_threaded_rod(
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left_handed=false,
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bevel=false,
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internal=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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trapezoidal_threaded_rod(
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d=d, l=l, pitch=pitch,
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@ -742,9 +855,7 @@ module acme_threaded_nut(
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starts=1,
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left_handed=false,
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bevel=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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trapezoidal_threaded_nut(
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od=od, id=id, h=h, pitch=pitch,
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@ -789,9 +900,7 @@ module square_threaded_rod(
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bevel=false,
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starts=1,
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internal=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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trapezoidal_threaded_rod(
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d=d, l=l, pitch=pitch,
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@ -832,9 +941,7 @@ module square_threaded_nut(
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left_handed=false,
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bevel=false,
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starts=1,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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trapezoidal_threaded_nut(
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od=od, id=id, h=h, pitch=pitch,
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@ -884,9 +991,7 @@ module ball_screw_rod(
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left_handed=false,
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internal=false,
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bevel=false,
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anchor=CENTER,
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spin=0,
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orient=UP
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anchor, spin, orient
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) {
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depth = ball_diam * (1-cos(ball_arc/2))/2;
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profile = arc(N=11, d=ball_diam/pitch, cp=[0,ball_diam/2/pitch*cos(ball_arc/2)], start=270-ball_arc/2, angle=ball_arc);
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@ -6,7 +6,7 @@
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//////////////////////////////////////////////////////////////////////
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BOSL_VERSION = [2,0,553];
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BOSL_VERSION = [2,0,554];
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// Section: BOSL Library Version Functions
|
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Reference in a new issue