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Tweaks to worm() and worm_gear()

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Revar Desmera 2023-07-21 01:04:02 -07:00
parent 3775149591
commit d88c960c38
1 changed files with 13 additions and 6 deletions
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19
gears.scad
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@ -1603,6 +1603,7 @@ function worm(
diam_pitch, diam_pitch,
mod, mod,
pitch, pitch,
gear_spin=0,
anchor=CENTER, anchor=CENTER,
spin=0, spin=0,
orient=UP orient=UP
@ -1620,7 +1621,7 @@ function worm(
assert(is_finite(backlash) && backlash>=0) assert(is_finite(backlash) && backlash>=0)
assert(is_bool(left_handed)) assert(is_bool(left_handed))
assert(is_finite(profile_shift) && abs(profile_shift)<1) assert(is_finite(profile_shift) && abs(profile_shift)<1)
//assert(is_finite(gear_spin)) assert(is_finite(gear_spin))
let( let(
helical = asin(starts * circ_pitch / PI / d), helical = asin(starts * circ_pitch / PI / d),
trans_pitch = circ_pitch / cos(helical), trans_pitch = circ_pitch / cos(helical),
@ -1641,7 +1642,7 @@ function worm(
], ],
steps = max(36, segs(d/2)), steps = max(36, segs(d/2)),
step = 360 / steps, step = 360 / steps,
zsteps = ceil(l / circ_pitch * cos(helical) / starts * steps), zsteps = ceil(l / trans_pitch / starts * steps),
zstep = l / zsteps, zstep = l / zsteps,
profiles = [ profiles = [
for (j = [0:1:zsteps]) [ for (j = [0:1:zsteps]) [
@ -1649,14 +1650,18 @@ function worm(
u = i / steps - 0.5, u = i / steps - 0.5,
ang = 360 * (1 - u) + 90, ang = 360 * (1 - u) + 90,
z = j*zstep - l/2, z = j*zstep - l/2,
zoff = circ_pitch * starts * u / cos(helical), zoff = trans_pitch * starts * u,
h = lookup(z+zoff, rack_profile) h = lookup(z+zoff, rack_profile)
) )
cylindrical_to_xyz(d/2+h, ang, z) cylindrical_to_xyz(d/2+h, ang, z)
] ]
], ],
vnf1 = vnf_vertex_array(profiles, caps=true, col_wrap=true, style="alt"), vnf1 = vnf_vertex_array(profiles, caps=true, col_wrap=true, style="alt"),
vnf = left_handed? xflip(p=vnf1) : vnf1 m = product([
zrot(gear_spin),
if (left_handed) xflip(),
]),
vnf = apply(m, vnf1)
) reorient(anchor,spin,orient, d=d, l=l, p=vnf); ) reorient(anchor,spin,orient, d=d, l=l, p=vnf);
@ -1690,6 +1695,8 @@ module worm(
assert(is_bool(left_handed)) assert(is_bool(left_handed))
assert(is_finite(gear_spin)) assert(is_finite(gear_spin))
assert(is_finite(profile_shift) && abs(profile_shift)<1); assert(is_finite(profile_shift) && abs(profile_shift)<1);
helical = asin(starts * circ_pitch / PI / d);
trans_pitch = circ_pitch / cos(helical);
vnf = worm( vnf = worm(
circ_pitch=circ_pitch, circ_pitch=circ_pitch,
starts=starts, starts=starts,
@ -1702,7 +1709,7 @@ module worm(
mod=mod mod=mod
); );
attachable(anchor,spin,orient, d=d, l=l) { attachable(anchor,spin,orient, d=d, l=l) {
zrot(gear_spin) vnf_polyhedron(vnf, convexity=ceil(l/circ_pitch)*2); zrot(gear_spin) vnf_polyhedron(vnf, convexity=ceil(l/trans_pitch)*2);
children(); children();
} }
} }
@ -1850,7 +1857,7 @@ function worm_gear(
left(hob_rad) * left(hob_rad) *
zrot(-90) * zrot(-90) *
back(tbot) * back(tbot) *
scale(cos(u*worm_arc)) * scale(pow(cos(u*worm_arc),2)) *
fwd(tbot), fwd(tbot),
path3d(tooth_profile) path3d(tooth_profile)
) )