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doc fix

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Adrian Mariano 2025-10-15 21:15:50 -04:00
parent 55710a08f8
commit f4021636f4
2 changed files with 46 additions and 32 deletions
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68
gears.scad
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@ -2788,7 +2788,7 @@ function worm(
helical=helical, helical=helical,
profile_shift=0 profile_shift=0
), 1, -2), ), 1, -2),
ff=echo(tooth=tooth, rack_profile=rack_profile,nrp=nrp), // ff=echo(tooth=tooth, rack_profile=rack_profile,nrp=nrp),
steps = max(36, segs(d/2)), steps = max(36, segs(d/2)),
step = 360 / steps, step = 360 / steps,
zsteps = ceil(l / trans_pitch / starts * steps), zsteps = ceil(l / trans_pitch / starts * steps),
@ -3142,7 +3142,7 @@ function worm_gear(
) )
assert(is_finite(worm_diam) && worm_diam>0) assert(is_finite(worm_diam) && worm_diam>0)
assert(is_integer(teeth) && teeth>7) assert(is_integer(teeth) && teeth>7)
assert(is_finite(worm_arc) && worm_arc>0 && worm_arc <= 60) // assert(is_finite(worm_arc) && worm_arc>0 && worm_arc <= 60)
assert(is_integer(worm_starts) && worm_starts>0) assert(is_integer(worm_starts) && worm_starts>0)
assert(is_bool(left_handed)) assert(is_bool(left_handed))
assert(is_finite(backlash)) assert(is_finite(backlash))
@ -3153,31 +3153,43 @@ function worm_gear(
gear_arc = 2 * PA, gear_arc = 2 * PA,
helical = asin(worm_starts * circ_pitch / PI / worm_diam), helical = asin(worm_starts * circ_pitch / PI / worm_diam),
//fee=echo(helical=helical), //fee=echo(helical=helical),
full_tooth = apply( full_tooth = path3d(reverse(zrot(90, _gear_tooth_profile(
zrot(90) * scale(0.99),
_gear_tooth_profile(
circ_pitch, teeth=teeth, circ_pitch, teeth=teeth,
pressure_angle=PA, pressure_angle=PA,
profile_shift=-profile_shift, profile_shift=profile_shift,
clearance=clearance, clearance=clearance,shorten=.3,
helical=helical, internal=false, helical=helical, internal=false,
center=true center=true)))),
) bnd = pointlist_bounds(full_tooth),
), fdeewqqq= echo(toothbounds = bnd)echo(toothlength = bnd[1].x-bnd[0].x),
tooth_bot = pointlist_bounds(full_tooth)[1].x,
ftl = len(full_tooth), ftl = len(full_tooth),
tooth_half1 = (select(full_tooth, 0, ftl/2-1)), tooth_half1 = select(full_tooth, 0, ftl/2-1),
tooth_half2 = (select(full_tooth, ftl/2, -1)), tooth_half2 = select(full_tooth, ftl/2, -1),
//eer= echo(full_tooth=full_tooth),
//fdewq= echo(tooth_half1=tooth_half1)echo(tooth_half2=tooth_half2),
tang = 360 / teeth, tang = 360 / teeth,
rteeth = (quantdn(teeth * gear_arc / 360, 2) / 2 + 0.5),
pr = pitch_radius(circ_pitch, teeth, helical=helical), pr = pitch_radius(circ_pitch, teeth, helical=helical),
//feee=echo(pr_worm = pr, circ_pitch, teeth, helical),
circum = 2*PI*pr, // Compute thickness based on tooth form and worm_arc for no crowning
tan_helical = tan(helical), half_thickness = sin(worm_arc/2)*(worm_diam/2+tooth_bot),
// Update worm_arc to account for crowning and produce same thickness
worm_arc = 2*asin(half_thickness / (worm_diam/2 + crowning + tooth_bot)),
feee=echo(pr_worm = pr, teeth=teeth ,helical= helical),
// When multiplied by z this gives the spin required to rotationally shear
// a straight tooth so that it follows the specified helical angle.
shear_angle_per_z = (left_handed?-1:1) * 360 * tan(helical) / (2*PI*pr),
oslices = slices * 4, oslices = slices * 4,
// Tooth is in xy plane, centered, pointing in Y+ direction
//
rows = [ rows = [
for (data = [[tooth_half1,1], [tooth_half2,-1]]) for (data = [[tooth_half1,1], [tooth_half2,-1]])
let ( let (
tooth_half = (data[0]), tooth_half = data[0],
dir = data[1] dir = data[1]
) )
for (pt = tooth_half) [ for (pt = tooth_half) [
@ -3185,15 +3197,16 @@ function worm_gear(
let ( let (
u = i / oslices, u = i / oslices,
w_ang = worm_arc * (u - 0.5), w_ang = worm_arc * (u - 0.5),
g_ang_delta = w_ang/360 * tang * worm_starts * (left_handed?1:-1) *0 , m = left(crowning) *
m = //zrot(dir*rteeth*tang+g_ang_delta, cp=[worm_diam/2+pr,0,0]) *
left(crowning) *
yrot(w_ang) * yrot(w_ang) *
right(worm_diam/2+crowning) * right(worm_diam/2+crowning),
//zrot(-dir*rteeth*tang+g_ang_delta, cp=[pr,0,0]) * pt = apply(m, pt),
xrot(180), L = 2*PI*worm_diam/2*w_ang/360 * tan(helical),
pt = apply(m, point3d(pt)), // zang = -360*L/(2*PI*pr),
angled_pt = zrot((left_handed?-1:1)*360*pt.z*tan_helical/circum,pt,cp=[worm_diam/2+pr,0,0]) // zang = -asin(L/pr),
// angled_pt = zrot(shear_angle_per_z * pt.z, pt, cp=[worm_diam/2+pr,0,0])
// angled_pt = zrot(zang, pt, cp=[worm_diam/2+pr,0,0])
angled_pt = back(L,pt)
) angled_pt ) angled_pt
] ]
], ],
@ -3226,6 +3239,7 @@ function worm_gear(
) )
get_thickness? zmax*2 : get_thickness? zmax*2 :
let( let(
feef=echo(actual_thick=zmax*2, est=half_thickness*2),
gear_rows = [ gear_rows = [
for (i = [0:1:teeth-1]) for (i = [0:1:teeth-1])
let( let(
@ -3271,7 +3285,7 @@ module worm_gear(
assert(is_integer(teeth) && teeth>10) assert(is_integer(teeth) && teeth>10)
assert(is_finite(worm_diam) && worm_diam>0) assert(is_finite(worm_diam) && worm_diam>0)
assert(is_integer(worm_starts) && worm_starts>0) assert(is_integer(worm_starts) && worm_starts>0)
assert(is_finite(worm_arc) && worm_arc>0 && worm_arc<90) // assert(is_finite(worm_arc) && worm_arc>0 && worm_arc<90)
assert(is_finite(crowning) && crowning>=0) assert(is_finite(crowning) && crowning>=0)
assert(is_bool(left_handed)) assert(is_bool(left_handed))
assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.") assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
@ -3371,6 +3385,7 @@ function _gear_tooth_profile(
// Calculate the important circle radii // Calculate the important circle radii
arad = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=internal, shorten=shorten), arad = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=internal, shorten=shorten),
ffe=echo(arad=arad),
prad = pitch_radius(circ_pitch, teeth, helical=helical), prad = pitch_radius(circ_pitch, teeth, helical=helical),
brad = _base_radius(circ_pitch, teeth, pressure_angle, helical=helical), brad = _base_radius(circ_pitch, teeth, pressure_angle, helical=helical),
rrad = _root_radius_basic(circ_pitch, teeth, clear, helical=helical, profile_shift=profile_shift, internal=internal), rrad = _root_radius_basic(circ_pitch, teeth, clear, helical=helical, profile_shift=profile_shift, internal=internal),
@ -3989,7 +4004,6 @@ function outer_radius(circ_pitch, teeth, clearance, internal=false, helical=0, p
// root radius so that you can, for example, place a partial tooth gear onto a matching circle. The `backlash` parameter may seem // root radius so that you can, for example, place a partial tooth gear onto a matching circle. The `backlash` parameter may seem
// unnecessary, but when large pressure angle teeth are clipped, the value of backlash changes the clipping radius. For regular // unnecessary, but when large pressure angle teeth are clipped, the value of backlash changes the clipping radius. For regular
// gear teeth, `backlash` has no effect on the radius. // gear teeth, `backlash` has no effect on the radius.
// Arguments: // Arguments:
// teeth = The number of teeth on the gear. // teeth = The number of teeth on the gear.
// helical = The helical angle (from vertical) of the teeth on the gear. Default: 0 // helical = The helical angle (from vertical) of the teeth on the gear. Default: 0

2
masks.scad
View file

@ -1975,7 +1975,7 @@ module teardrop_edge_mask(l, r, angle=45, excess=0.1, d, anchor=CTR, spin=0, ori
// Module: polygon_edge_mask() // Module: polygon_edge_mask()
// Symopsis: Converts a 2d mask to 3d mask suitable for a 3d edge // Synopsis: Extrudes a 2d mask polygon to an edge mask with a correct corner anchor
// SynTags: Geom // SynTags: Geom
// Topics: Masks, Shapes (3D) // Topics: Masks, Shapes (3D)
// See Also: edge_profile(), edge_profile_asym(), diff() // See Also: edge_profile(), edge_profile_asym(), diff()