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Fixed bevel_gear() anchoring.
This commit is contained in:
Garth Minette
parent
5dc473071f
commit
6687b4cafc
1 changed files with 25 additions and 19 deletions
44
gears.scad
44
gears.scad
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@ -900,7 +900,7 @@ function bevel_gear(
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teeth = 20,
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face_width = 10,
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pitch_angle = 45,
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mate_teeth = undef,
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mate_teeth,
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hide = 0,
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pressure_angle = 20,
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clearance = undef,
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@ -908,7 +908,7 @@ function bevel_gear(
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cutter_radius = 30,
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spiral_angle = 35,
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left_handed = false,
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slices = 1,
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slices = 5,
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interior = false,
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mod,
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anchor = "pitchbase",
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@ -921,7 +921,7 @@ function bevel_gear(
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pitch_angle = is_undef(mate_teeth)? pitch_angle : atan(teeth/mate_teeth),
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pr = pitch_radius(pitch, teeth),
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rr = root_radius(pitch, teeth, clearance, interior),
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pitchoff = (pr-rr) * cos(pitch_angle),
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pitchoff = (pr-rr) * sin(pitch_angle),
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ocone_rad = opp_ang_to_hyp(pr, pitch_angle),
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icone_rad = ocone_rad - face_width,
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cutter_radius = cutter_radius==0? 1000 : cutter_radius,
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@ -932,9 +932,6 @@ function bevel_gear(
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radcpang = vang(radcp),
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sang = radcpang - (180-angC1),
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eang = radcpang - (180-angC2),
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slice_us = [for (i=[0:1:slices]) i/slices],
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apts = [for (u=slice_us) radcp + polar_to_xy(cutter_radius, lerp(sang,eang,u))],
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polars = [for (p=apts) [vang(p)-90, norm(p)]],
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profile = gear_tooth_profile(
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pitch = pitch,
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teeth = teeth,
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@ -946,12 +943,16 @@ function bevel_gear(
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center = true
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),
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verts1 = [
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for (polar=polars) [
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for (v = lerpn(0,1,slices+1)) let(
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p = radcp + polar_to_xy(cutter_radius, lerp(sang,eang,v)),
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ang = vang(p)-90,
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dist = norm(p)
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) [
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let(
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u = polar.y / ocone_rad,
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u = dist / ocone_rad,
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m = up((1-u) * pr / tan(pitch_angle)) *
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up(pitchoff) *
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zrot(polar.x/sin(pitch_angle)) *
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zrot(ang/sin(pitch_angle)) *
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back(u * pr) *
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xrot(pitch_angle) *
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scale(u)
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@ -960,8 +961,11 @@ function bevel_gear(
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each apply(xflip() * zrot(360*tooth/teeth) * m, path3d(profile))
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]
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],
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thickness = abs(verts1[0][0].z - last(verts1)[0].z),
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vertices = [for (x=verts1) down(thickness/2, p=reverse(x))],
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botz = verts1[0][0].z,
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topz = last(verts1)[0].z,
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thickness = abs(topz - botz),
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cpz = (topz + botz) / 2,
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vertices = [for (x=verts1) reverse(x)],
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sides_vnf = vnf_vertex_array(vertices, caps=false, col_wrap=true, reverse=true),
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top_verts = last(vertices),
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bot_verts = vertices[0],
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@ -988,7 +992,8 @@ function bevel_gear(
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],
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sides_vnf
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]),
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vnf = left_handed? vnf1 : xflip(p=vnf1),
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lvnf = left_handed? vnf1 : xflip(p=vnf1),
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vnf = down(cpz, p=lvnf),
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anchors = [
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anchorpt("pitchbase", [0,0,pitchoff-thickness/2]),
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anchorpt("flattop", [0,0,thickness/2]),
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@ -998,8 +1003,8 @@ function bevel_gear(
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module bevel_gear(
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pitch = 3,
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teeth = 11,
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pitch = 5,
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teeth = 20,
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face_width = 10,
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pitch_angle = 45,
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mate_teeth,
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@ -1011,7 +1016,7 @@ module bevel_gear(
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cutter_radius = 30,
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spiral_angle = 35,
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left_handed = false,
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slices = 1,
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slices = 5,
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interior = false,
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mod,
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anchor = "pitchbase",
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@ -1024,8 +1029,7 @@ module bevel_gear(
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pr = pitch_radius(pitch, teeth);
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ipr = pr - face_width*sin(pitch_angle);
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rr = root_radius(pitch, teeth, clearance, interior);
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pitchoff = (pr-rr) * cos(pitch_angle);
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thickness = face_width * cos(pitch_angle);
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pitchoff = (pr-rr) * sin(pitch_angle);
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vnf = bevel_gear(
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pitch = pitch,
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teeth = teeth,
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@ -1042,6 +1046,8 @@ module bevel_gear(
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interior = interior,
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anchor=CENTER
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);
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axis_zs = [for (p=vnf[0]) if(norm(point2d(p)) < EPSILON) p.z];
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thickness = max(axis_zs) - min(axis_zs);
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anchors = [
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anchorpt("pitchbase", [0,0,pitchoff-thickness/2]),
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anchorpt("flattop", [0,0,thickness/2]),
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@ -1288,7 +1294,7 @@ function worm(
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apply(zrot(a)*up(z), path3d(cross_sect))
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],
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rprofiles = [ for (prof=profiles) reverse(prof) ],
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vnf1 = vnf_vertex_array(rprofiles, caps=true, col_wrap=true, style="quincunx"),
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vnf1 = vnf_vertex_array(rprofiles, caps=true, col_wrap=true, style="min_edge"),
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vnf = left_handed? xflip(p=vnf1) : vnf1
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) reorient(anchor,spin,orient, d=d, l=l, p=vnf);
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@ -1445,7 +1451,7 @@ function worm_gear(
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[gear_pts, ((i+1)%teeth)*face_pts, (i+1)*face_pts-1]
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]
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],
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sides_vnf = vnf_vertex_array(profiles, caps=false, col_wrap=true, style="quincunx"),
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sides_vnf = vnf_vertex_array(profiles, caps=false, col_wrap=true, style="min_edge"),
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vnf1 = vnf_merge([
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[
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[each top_verts, [0,0,top_verts[0].z]],
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