mirror of
https://github.com/BelfrySCAD/BOSL2.git
synced 2025-01-01 09:49:45 +00:00
Merge pull request #1209 from BelfrySCAD/revarbat_dev
Fixes for gear tooth profiles.
This commit is contained in:
Revar Desmera
GitHub
commit
dbcc231336
1 changed files with 35 additions and 27 deletions
60
gears.scad
60
gears.scad
|
|
@ -1603,6 +1603,7 @@ function worm(
|
|||
diam_pitch,
|
||||
mod,
|
||||
pitch,
|
||||
gear_spin=0,
|
||||
anchor=CENTER,
|
||||
spin=0,
|
||||
orient=UP
|
||||
|
|
@ -1620,7 +1621,7 @@ function worm(
|
|||
assert(is_finite(backlash) && backlash>=0)
|
||||
assert(is_bool(left_handed))
|
||||
assert(is_finite(profile_shift) && abs(profile_shift)<1)
|
||||
//assert(is_finite(gear_spin))
|
||||
assert(is_finite(gear_spin))
|
||||
let(
|
||||
helical = asin(starts * circ_pitch / PI / d),
|
||||
trans_pitch = circ_pitch / cos(helical),
|
||||
|
|
@ -1641,7 +1642,7 @@ function worm(
|
|||
],
|
||||
steps = max(36, segs(d/2)),
|
||||
step = 360 / steps,
|
||||
zsteps = ceil(l / circ_pitch * cos(helical) / starts * steps),
|
||||
zsteps = ceil(l / trans_pitch / starts * steps),
|
||||
zstep = l / zsteps,
|
||||
profiles = [
|
||||
for (j = [0:1:zsteps]) [
|
||||
|
|
@ -1649,14 +1650,18 @@ function worm(
|
|||
u = i / steps - 0.5,
|
||||
ang = 360 * (1 - u) + 90,
|
||||
z = j*zstep - l/2,
|
||||
zoff = circ_pitch * starts * u / cos(helical),
|
||||
zoff = trans_pitch * starts * u,
|
||||
h = lookup(z+zoff, rack_profile)
|
||||
)
|
||||
cylindrical_to_xyz(d/2+h, ang, z)
|
||||
]
|
||||
],
|
||||
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);
|
||||
|
||||
|
||||
|
|
@ -1690,6 +1695,8 @@ module worm(
|
|||
assert(is_bool(left_handed))
|
||||
assert(is_finite(gear_spin))
|
||||
assert(is_finite(profile_shift) && abs(profile_shift)<1);
|
||||
helical = asin(starts * circ_pitch / PI / d);
|
||||
trans_pitch = circ_pitch / cos(helical);
|
||||
vnf = worm(
|
||||
circ_pitch=circ_pitch,
|
||||
starts=starts,
|
||||
|
|
@ -1702,7 +1709,7 @@ module worm(
|
|||
mod=mod
|
||||
);
|
||||
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();
|
||||
}
|
||||
}
|
||||
|
|
@ -1850,7 +1857,7 @@ function worm_gear(
|
|||
left(hob_rad) *
|
||||
zrot(-90) *
|
||||
back(tbot) *
|
||||
scale(cos(u*worm_arc)) *
|
||||
scale(pow(cos(u*worm_arc),2)) *
|
||||
fwd(tbot),
|
||||
path3d(tooth_profile)
|
||||
)
|
||||
|
|
@ -2002,6 +2009,9 @@ function _gear_tooth_profile(
|
|||
helical = 0,
|
||||
internal = false,
|
||||
profile_shift = 0.0,
|
||||
mod,
|
||||
diam_pitch,
|
||||
pitch,
|
||||
center = false
|
||||
) = let(
|
||||
// Calculate a point on the involute curve, by angle.
|
||||
|
|
@ -2009,6 +2019,7 @@ function _gear_tooth_profile(
|
|||
let(b=a*PI/180) base_r * [cos(a)+b*sin(a), sin(a)-b*cos(a)],
|
||||
|
||||
steps = 16,
|
||||
circ_pitch = circular_pitch(pitch=pitch, circ_pitch=circ_pitch, diam_pitch=diam_pitch, mod=mod),
|
||||
|
||||
// Calculate the important circle radii
|
||||
arad = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=internal),
|
||||
|
|
@ -2072,8 +2083,8 @@ function _gear_tooth_profile(
|
|||
|
||||
// The u values to use when generating the tooth.
|
||||
us = [
|
||||
for (i=[0:1:20-1]) 0.2*sin(i/20*90),
|
||||
for (i=[2:1:steps-1]) i/(steps-1),
|
||||
for (i=[0.0:0.02:0.2-EPSILON]) i,
|
||||
for (i=[0:1:steps-1]) 0.2 + i/(steps-1)*0.8,
|
||||
],
|
||||
|
||||
// Generate the left half of the tooth.
|
||||
|
|
@ -2089,26 +2100,23 @@ function _gear_tooth_profile(
|
|||
) polar_to_xy(ma_rad, a),
|
||||
]),
|
||||
|
||||
// Find undercut bottom "jaggie" if it exists.
|
||||
minima = [
|
||||
for (i = idx(tooth_half_raw))
|
||||
let(p = tooth_half_raw[i])
|
||||
if (i > 0 && i < len(tooth_half_raw)-1 && norm(p) <= prad)
|
||||
let(
|
||||
pp = tooth_half_raw[i-1],
|
||||
np = tooth_half_raw[i+1]
|
||||
)
|
||||
if (p.x > pp.x && p.x > np.x)
|
||||
i
|
||||
],
|
||||
|
||||
// Strip "jaggies" if found.
|
||||
tooth_half = len(minima)<2? tooth_half_raw : [
|
||||
for (i = idx(tooth_half_raw))
|
||||
let(p = tooth_half_raw[i])
|
||||
if (i <= minima[0] || i >= last(minima))
|
||||
p
|
||||
strip_left = function(path,i)
|
||||
i > len(path)? [] :
|
||||
norm(path[i]) >= prad? [for (j=idx(path)) if(j>=i) path[j]] :
|
||||
let(
|
||||
angs = [
|
||||
for (j=[i+1:1:len(path)-1]) let(
|
||||
p = path[i],
|
||||
np = path[j],
|
||||
r = norm(np),
|
||||
a = v_theta(np-p)
|
||||
) if(r<prad) a
|
||||
],
|
||||
mti = !angs? 0 : min_index(angs),
|
||||
out = concat([path[i]], strip_left(path, i + mti + 1))
|
||||
) out,
|
||||
tooth_half = strip_left(tooth_half_raw, 0),
|
||||
|
||||
// Mirror the tooth to complete it.
|
||||
tooth = deduplicate([
|
||||
|
|
|
|||
Loading…
Reference in a new issue