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https://github.com/BelfrySCAD/BOSL2.git
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Fixed some issues with internal threading.
Tightening code slightly for generic threaded rod Added figure showing flank angle
This commit is contained in:
Adrian Mariano
parent
1f7d17eab6
commit
c4c9b6cd93
1 changed files with 60 additions and 31 deletions
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@ -916,16 +916,15 @@ module generic_threaded_rod(
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rmax = max(_r1,_r2)+pmax;
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depth = pdepth * pitch;
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dummy1 = assert(_r1>depth && _r2>depth, "Screw profile deeper than rod radius");
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skew_mat = affine3d_skew(sxz=(_r2-_r1)/l);
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map3d_and_scale = affine3d_frame_map(x=[0,0,1], y=[1,0,0]) // Map profile to 3d, parallel to z axis
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map_threads = right((_r1 + _r2) / 2) // Shift profile out to thread radius
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* affine3d_skew(sxz=(_r2-_r1)/l) // Skew correction for tapered threads
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* affine3d_frame_map(x=[0,0,1], y=[1,0,0]) // Map profile to 3d, parallel to z axis
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* scale(pitch); // scale profile by pitch
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hig_table = [
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[-twist, 0],
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[-twist/2-0.00001, 0],
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[-twist/2-0.0001, 0],
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[-twist/2+higang1, 1],
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[+twist/2-higang2, 1],
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[+twist/2+0.00001, 0],
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[+twist, 0],
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[ twist/2-higang2, 1],
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[ twist/2+0.0001, 0],
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];
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start_steps = sides / starts;
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thread_verts = [
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@ -934,10 +933,7 @@ module generic_threaded_rod(
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for (step = [0:1:start_steps]) let(
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ang = 360 * step/sides,
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dz = step / start_steps, // z offset for threads at this angle
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rot_prof = zrot(ang*dir) // Rotate profile to correct angular location
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* right((_r1 + _r2) / 2) // Shift profile out to thread radius
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* skew_mat // Skew correction for tapered threads
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* map3d_and_scale, // Map profile into 3d
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rot_prof = zrot(ang*dir)*map_threads, // Rotate profile to correct angular location
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full_profile = [ // profile for the entire rod
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for (thread = [-threads/2:1:threads/2-1]) let(
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tang = (thread/starts) * 360 + ang,
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@ -961,20 +957,21 @@ module generic_threaded_rod(
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style = higang1>0 || higang2>0 ? "quincunx" : "min_edge";
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thread_vnfs = vnf_merge([
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// Main thread faces
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for (i=[0:1:starts-1])
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zrot(i*360/starts, p=vnf_vertex_array(thread_verts, reverse=left_handed, style=style)),
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// Top closing face(s) of thread
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for (i=[0:1:starts-1]) let(
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rmat = zrot(i*360/starts),
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pts = deduplicate(list_head(thread_verts[0], len(prof3d)+1)),
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faces = [for (i=idx(pts,e=-2)) [0, i+1, i]],
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rfaces = left_handed? [for (x=faces) reverse(x)] : faces
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) [apply(rmat,pts), rfaces],
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faces = [for (i=idx(pts,e=-2)) left_handed ? [0, i, i+1] : [0, i+1, i]]
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) [apply(rmat,pts), faces],
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// Bottom closing face(s) of thread
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for (i=[0:1:starts-1]) let(
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rmat = zrot(i*360/starts),
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pts = deduplicate(list_tail(last(thread_verts), -len(prof3d)-2)),
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faces = [for (i=idx(pts,e=-2)) [len(pts)-1, i, i+1]],
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rfaces = left_handed? [for (x=faces) reverse(x)] : faces
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) [apply(rmat,pts), rfaces]
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faces = [for (i=idx(pts,e=-2)) left_handed ? [len(pts)-1, i+1, i] : [len(pts)-1, i, i+1]]
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) [apply(rmat,pts), faces]
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]);
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slope = (_r1-_r2)/l;
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@ -986,22 +983,30 @@ module generic_threaded_rod(
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// This method is faster but more complex code and it produces green tops
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difference() {
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//vnf_validate(vnf_quantize(thread_vnfs), size=0.1);
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vnf_polyhedron(vnf_quantize(thread_vnfs),convexity=10);
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if (!internal){
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if (bevel1 || bevel2)
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rotate_extrude(){
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if (bevel2) polygon([[0,l/2], [_r2+pmax-depth, l/2], [_r2+pmax+slope*depth,l/2-depth], [rmax+1, l/2-depth], [rmax+1,l/2+maxlen], [0,l/2+maxlen]]);
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if (bevel1) polygon([[0,-l/2], [_r1+pmax-depth, -l/2], [_r1+pmax-slope*depth,-l/2+depth], [rmax+1, -l/2+depth], [rmax+1,-l/2-maxlen], [0,-l/2-maxlen]]);
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if (bevel2) polygon([[ 0, l/2],
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[_r2+pmax-depth, l/2],
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[_r2+pmax+slope*depth, l/2-depth],
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[ rmax+1, l/2-depth],
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[rmax+1, l/2+maxlen],
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[ 0, l/2+maxlen]]);
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if (bevel1) polygon([[ 0,-l/2],
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[_r1+pmax-depth, -l/2],
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[_r1+pmax-slope*depth, -l/2+depth],
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[ rmax+1, -l/2+depth],
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[rmax+1, -l/2-maxlen],
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[ 0, -l/2-maxlen]]);
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}
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if (!bevel1)
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}
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if (!bevel1 || internal)
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down(l/2) cuboid([2*rmax+1,2*rmax+1, maxlen], anchor=TOP);
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if (!bevel2)
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if (!bevel2 || internal)
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up(l/2) cuboid([2*rmax+1,2*rmax+1, maxlen], anchor=BOTTOM);
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}
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}
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/* intersection(){
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//vnf_validate(vnf_quantize(thread_vnfs), size=0.1);
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@ -1009,12 +1014,12 @@ module generic_threaded_rod(
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cyl(l=l, r1=_r1+pmax, r2=_r2+pmax, chamfer1=bevel1?depth:undef, chamfer2=bevel2?depth:undef);
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}*/
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// Add bevel for internal threads
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// Add bevel for internal thread mask
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if (internal) {
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if (bevel1)
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down(l/2)cyl(l=depth, r1=_r1+pmax, r2=_r1+pmax-slope*depth-depth,anchor=BOTTOM);
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down(l/2+.001)cyl(l=depth, r1=_r1+pmax, r2=_r1+pmax-slope*depth-depth,anchor=BOTTOM);
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if (bevel2)
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up(l/2)cyl(l=depth, r2=_r2+pmax, r1=_r2+pmax+slope*depth-depth,anchor=TOP);
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up(l/2+.001)cyl(l=depth, r2=_r2+pmax, r1=_r2+pmax+slope*depth-depth,anchor=TOP);
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}
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}
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children();
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@ -1111,7 +1116,7 @@ module generic_threaded_nut(
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// subtract any $slop for clearance.
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// .
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// Higbee specifies tapering applied to the ends of the threads and is given as the linear distance
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// over which to taper.
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// over which to taper. Tapering works on both internal and external threads.
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// Arguments:
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// d = Inside base diameter of threads. Default: 10
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// pitch = Distance between threads. Default: 2mm/thread
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@ -1141,6 +1146,30 @@ module generic_threaded_nut(
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// [ 6/16, 0 ],
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// ];
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// stroke(profile, width=0.02);
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// Figure(2D,Med):
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// pa_delta = tan(15)/4;
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// rr1 = -1/2;
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// z1 = 1/4-pa_delta;
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// z2 = 1/4+pa_delta;
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// profile = [
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// [-z2, rr1],
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// [-z1, 0],
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// [ z1, 0],
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// [ z2, rr1],
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// ];
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// fullprofile = 50*left(1/2,p=concat(profile, right(1, p=profile)));
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// stroke(fullprofile,width=1);
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// dir = fullprofile[2]-fullprofile[3];
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// dir2 = fullprofile[5]-fullprofile[4];
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// curve = arc(15,angle=[75,87],r=40 /*67.5*/);
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// avgpt = mean([fullprofile[5]+.1*dir2, fullprofile[5]+.4*dir2]);
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// color("red"){
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// stroke([fullprofile[4]+[0,1], fullprofile[4]+[0,37]], width=1);
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// stroke([fullprofile[5]+.1*dir2, fullprofile[5]+.4*dir2], width=1);
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// stroke(move(-curve[0]+avgpt,p=curve), width=0.71,endcaps="arrow2");
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// right(14)back(19)text("flank",size=4,halign="center");
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// right(14)back(14)text("angle",size=4,halign="center");
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// }
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// Example:
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// thread_helix(d=10, pitch=2, thread_depth=0.75, flank_angle=15, twist=900, $fn=72);
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// thread_helix(d=10, pitch=2, thread_depth=0.75, flank_angle=15, twist=900, higbee=1, $fn=72);
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