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Merge pull request #1875 from adrianVmariano/master
Decrease gear convexity
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adrianVmariano
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commit
6ce86cd8a4
2 changed files with 22 additions and 16 deletions
36
gears.scad
36
gears.scad
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@ -1021,7 +1021,9 @@ module spur_gear(
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profile_shift = auto_profile_shift(teeth,PA,helical,profile_shift=profile_shift);
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pr = pitch_radius(circ_pitch, teeth, helical);
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or = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=internal,shorten=shorten);
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rr = _root_radius_basic(circ_pitch, teeth, clearance, profile_shift=profile_shift, internal=internal);
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rr = root_radius(circ_pitch=circ_pitch, teeth=teeth, helical=helical, clearance=clearance, internal=internal,
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profile_shift=profile_shift, pressure_angle=PA, backlash=backlash);
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convexity = ceil(2 * teeth * hyp_adj_to_ang(or,rr)/180);
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anchor_rad = atype=="pitch" ? pr
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: atype=="tip" ? or
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: atype=="root" ? rr
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@ -1037,7 +1039,7 @@ module spur_gear(
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linear_extrude(
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height=thickness/2+0.01, center=false,
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twist=twist/2, slices=ceil(slices/2),
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convexity=teeth/2
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convexity=convexity
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) {
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spur_gear2d(
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circ_pitch = circ_pitch,
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@ -1058,7 +1060,7 @@ module spur_gear(
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linear_extrude(
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height=thickness, center=true,
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twist=twist, slices=slices,
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convexity=teeth/2
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convexity=convexity
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) {
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spur_gear2d(
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circ_pitch = circ_pitch,
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@ -1328,7 +1330,8 @@ module spur_gear2d(
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);
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pr = pitch_radius(circ_pitch, teeth, helical=helical);
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or = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=internal,shorten=shorten);
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rr = _root_radius_basic(circ_pitch, teeth, clearance, profile_shift=profile_shift, internal=internal);
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rr = root_radius(circ_pitch=circ_pitch, teeth=teeth, helical=helical, clearance=clearance, internal=internal,
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profile_shift=profile_shift, pressure_angle=PA, backlash=backlash);
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anchor_rad = atype=="pitch" ? pr
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: atype=="tip" ? or
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: atype=="root" ? rr
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@ -1439,7 +1442,9 @@ module ring_gear(
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assert(is_finite(gear_spin));
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pr = pitch_radius(circ_pitch, teeth, helical=helical);
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ar = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=true);
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rr=_root_radius_basic(circ_pitch, teeth, clearance, profile_shift=profile_shift, internal=true);
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//rr=_root_radius_basic(circ_pitch, teeth, clearance, profile_shift=profile_shift, internal=true, helical=helical);
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rr = root_radius(circ_pitch=circ_pitch, teeth=teeth, helical=helical, clearance=clearance, internal=true,
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profile_shift=profile_shift);
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or = is_def(or) ?
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assert(is_finite(or) && or>ar, "or is invalid or too small for teeth")
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or
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@ -1460,7 +1465,7 @@ module ring_gear(
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zrot(gear_spin)
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if (herringbone) {
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zflip_copy() down(0.01)
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linear_extrude(height=thickness/2, center=false, twist=twist/2, slices=ceil(slices/2), convexity=teeth/4) {
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linear_extrude(height=thickness/2, center=false, twist=twist/2, slices=ceil(slices/2), convexity=12) {
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difference() {
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circle(r=or);
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spur_gear2d(
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@ -1477,7 +1482,7 @@ module ring_gear(
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}
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} else {
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zrot(twist/2)
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linear_extrude(height=thickness,center=true, twist=twist, convexity=teeth/4) {
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linear_extrude(height=thickness,center=true, twist=twist, convexity=12) {
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difference() {
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circle(r=or);
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spur_gear2d(
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@ -1585,7 +1590,9 @@ module ring_gear2d(
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assert(is_finite(gear_spin));
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pr = pitch_radius(circ_pitch, teeth, helical=helical);
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ar = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=true);
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rr=_root_radius_basic(circ_pitch, teeth, clearance, profile_shift=profile_shift, internal=true);
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//rr=_root_radius_basic(circ_pitch, teeth, clearance, profile_shift=profile_shift, internal=true);
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rr = root_radius(circ_pitch=circ_pitch, teeth=teeth, helical=helical, clearance=clearance, internal=true,
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profile_shift=profile_shift);
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or = is_def(or) ?
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assert(is_finite(or) && or>ar, "or is invalid or too small for teeth")
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or
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@ -2317,7 +2324,7 @@ module crown_gear(
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gear_spin=gear_spin
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);
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attachable(anchor,spin,orient, r=pr+face_width, h=2*bottom) {
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vnf_polyhedron(vnf, convexity=teeth/2);
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vnf_polyhedron(vnf, convexity=12);
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children();
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}
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}
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@ -2689,7 +2696,7 @@ module bevel_gear(
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thickness = vnf_anchors[2];
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attachable(anchor,spin,orient, vnf=vnf, extent=true, anchors=anchors) {
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difference() {
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vnf_polyhedron(vnf, convexity=teeth/2);
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vnf_polyhedron(vnf, convexity=12);
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if (shaft_diam > 0)
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cylinder(h=2*thickness, r=shaft_diam/2, center=true, $fn=max(12,segs(shaft_diam/2)));
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}
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@ -3318,7 +3325,7 @@ module worm_gear(
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attachable(anchor,spin,orient, r=pr, l=thickness) {
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zrot(gear_spin)
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difference() {
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vnf_polyhedron(vnf, convexity=teeth/2);
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vnf_polyhedron(vnf, convexity=12);
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if (shaft_diam > 0) {
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cylinder(h=2*thickness+1, r=shaft_diam/2, center=true, $fn=max(12,segs(shaft_diam/2)));
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}
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@ -3388,7 +3395,6 @@ function _gear_tooth_profile(
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// Calculate the important circle radii
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arad = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=internal, shorten=shorten),
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ffe=echo(arad=arad),
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prad = pitch_radius(circ_pitch, teeth, helical=helical),
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brad = _base_radius(circ_pitch, teeth, pressure_angle, helical=helical),
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rrad = _root_radius_basic(circ_pitch, teeth, clear, helical=helical, profile_shift=profile_shift, internal=internal),
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@ -3522,7 +3528,7 @@ function _gear_tooth_profile(
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ipt = line_intersection([[0,0],polar_to_xy(1,90+180/teeth)], select(tooth_half,ind,ind+1)),
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c = prad - mod*(1-profile_shift) - norm(ipt)
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)
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echo(str(teeth, " tooth gear profile clipped at clearance = ",c))
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//echo(str(teeth, " tooth gear profile clipped at clearance = ",c))
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[
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ipt,
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each slice(tooth_half, ind+1,-1)
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@ -4026,11 +4032,11 @@ function outer_radius(circ_pitch, teeth, clearance, internal=false, helical=0, p
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// spur_gear2d(mod=mod, teeth=teeth, hide=floor(teeth/2));
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// circle(r=rr, $fn=64);
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function root_radius(teeth, helical=0, clearance, internal=false, profile_shift="auto", pressure_angle=20, mod, pitch, diam_pitch, backlash=0) =
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function root_radius(teeth, helical=0, clearance, internal=false, profile_shift="auto", pressure_angle=20, mod, circ_pitch, diam_pitch, backlash=0) =
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let(
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profile_shift = auto_profile_shift(teeth, pressure_angle, helical, profile_shift=profile_shift),
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tooth = _gear_tooth_profile(teeth=teeth, pressure_angle=pressure_angle, clearance=clearance, backlash=backlash, helical=helical,
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internal=internal, profile_shift=profile_shift, mod=mod, diam_pitch=diam_pitch, pitch=pitch),
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internal=internal, profile_shift=profile_shift, mod=mod, diam_pitch=diam_pitch, pitch=circ_pitch),
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miny = norm(tooth[0])
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)
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miny;
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@ -1664,7 +1664,7 @@ module ball_screw_rod(
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
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// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
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// $slop = The printer-specific slop value, which adds clearance (`4*$slop`) to internal threads.
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// Example(2DMed,VPD=1.92,VPT=[0.00,-0.30,2.50]): Example Tooth Profile. Note that the X range of the profile must be in [-1/2,1/2] because the profile will be scaled up by the pitch in order to produce the final thread profile.
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// Example(2DMed,VPD=1.92,VPT=[0.00,-0.30,2.5]): Example Tooth Profile. Note that the X range of the profile must be in [-1/2,1/2] because the profile will be scaled up by the pitch in order to produce the final thread profile.
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// pitch = 2;
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// depth = pitch * cos(30) * 5/8;
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// profile = [
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