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doc fix
This commit is contained in:
Adrian Mariano
parent
55710a08f8
commit
f4021636f4
2 changed files with 46 additions and 32 deletions
76
gears.scad
76
gears.scad
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@ -2788,7 +2788,7 @@ function worm(
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helical=helical,
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profile_shift=0
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), 1, -2),
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ff=echo(tooth=tooth, rack_profile=rack_profile,nrp=nrp),
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// ff=echo(tooth=tooth, rack_profile=rack_profile,nrp=nrp),
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steps = max(36, segs(d/2)),
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step = 360 / steps,
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zsteps = ceil(l / trans_pitch / starts * steps),
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@ -3142,7 +3142,7 @@ function worm_gear(
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)
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assert(is_finite(worm_diam) && worm_diam>0)
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assert(is_integer(teeth) && teeth>7)
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assert(is_finite(worm_arc) && worm_arc>0 && worm_arc <= 60)
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// assert(is_finite(worm_arc) && worm_arc>0 && worm_arc <= 60)
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assert(is_integer(worm_starts) && worm_starts>0)
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assert(is_bool(left_handed))
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assert(is_finite(backlash))
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@ -3153,31 +3153,43 @@ function worm_gear(
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gear_arc = 2 * PA,
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helical = asin(worm_starts * circ_pitch / PI / worm_diam),
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//fee=echo(helical=helical),
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full_tooth = apply(
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zrot(90) * scale(0.99),
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_gear_tooth_profile(
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circ_pitch, teeth=teeth,
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pressure_angle=PA,
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profile_shift=-profile_shift,
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clearance=clearance,
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helical=helical, internal=false,
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center=true
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)
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),
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full_tooth = path3d(reverse(zrot(90, _gear_tooth_profile(
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circ_pitch, teeth=teeth,
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pressure_angle=PA,
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profile_shift=profile_shift,
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clearance=clearance,shorten=.3,
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helical=helical, internal=false,
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center=true)))),
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bnd = pointlist_bounds(full_tooth),
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fdeewqqq= echo(toothbounds = bnd)echo(toothlength = bnd[1].x-bnd[0].x),
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tooth_bot = pointlist_bounds(full_tooth)[1].x,
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ftl = len(full_tooth),
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tooth_half1 = (select(full_tooth, 0, ftl/2-1)),
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tooth_half2 = (select(full_tooth, ftl/2, -1)),
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tooth_half1 = select(full_tooth, 0, ftl/2-1),
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tooth_half2 = select(full_tooth, ftl/2, -1),
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//eer= echo(full_tooth=full_tooth),
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//fdewq= echo(tooth_half1=tooth_half1)echo(tooth_half2=tooth_half2),
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tang = 360 / teeth,
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rteeth = (quantdn(teeth * gear_arc / 360, 2) / 2 + 0.5),
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pr = pitch_radius(circ_pitch, teeth, helical=helical),
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//feee=echo(pr_worm = pr, circ_pitch, teeth, helical),
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circum = 2*PI*pr,
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tan_helical = tan(helical),
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// Compute thickness based on tooth form and worm_arc for no crowning
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half_thickness = sin(worm_arc/2)*(worm_diam/2+tooth_bot),
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// Update worm_arc to account for crowning and produce same thickness
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worm_arc = 2*asin(half_thickness / (worm_diam/2 + crowning + tooth_bot)),
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feee=echo(pr_worm = pr, teeth=teeth ,helical= helical),
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// When multiplied by z this gives the spin required to rotationally shear
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// a straight tooth so that it follows the specified helical angle.
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shear_angle_per_z = (left_handed?-1:1) * 360 * tan(helical) / (2*PI*pr),
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oslices = slices * 4,
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// Tooth is in xy plane, centered, pointing in Y+ direction
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//
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rows = [
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for (data = [[tooth_half1,1], [tooth_half2,-1]])
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let (
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tooth_half = (data[0]),
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tooth_half = data[0],
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dir = data[1]
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)
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for (pt = tooth_half) [
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@ -3185,16 +3197,17 @@ function worm_gear(
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let (
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u = i / oslices,
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w_ang = worm_arc * (u - 0.5),
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g_ang_delta = w_ang/360 * tang * worm_starts * (left_handed?1:-1) *0 ,
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m = //zrot(dir*rteeth*tang+g_ang_delta, cp=[worm_diam/2+pr,0,0]) *
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left(crowning) *
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m = left(crowning) *
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yrot(w_ang) *
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right(worm_diam/2+crowning) *
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//zrot(-dir*rteeth*tang+g_ang_delta, cp=[pr,0,0]) *
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xrot(180),
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pt = apply(m, point3d(pt)),
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angled_pt = zrot((left_handed?-1:1)*360*pt.z*tan_helical/circum,pt,cp=[worm_diam/2+pr,0,0])
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) angled_pt
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right(worm_diam/2+crowning),
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pt = apply(m, pt),
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L = 2*PI*worm_diam/2*w_ang/360 * tan(helical),
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// zang = -360*L/(2*PI*pr),
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// zang = -asin(L/pr),
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// angled_pt = zrot(shear_angle_per_z * pt.z, pt, cp=[worm_diam/2+pr,0,0])
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// angled_pt = zrot(zang, pt, cp=[worm_diam/2+pr,0,0])
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angled_pt = back(L,pt)
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) angled_pt
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]
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],
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midrow = len(rows)/2,
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@ -3226,6 +3239,7 @@ function worm_gear(
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)
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get_thickness? zmax*2 :
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let(
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feef=echo(actual_thick=zmax*2, est=half_thickness*2),
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gear_rows = [
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for (i = [0:1:teeth-1])
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let(
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@ -3271,7 +3285,7 @@ module worm_gear(
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assert(is_integer(teeth) && teeth>10)
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assert(is_finite(worm_diam) && worm_diam>0)
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assert(is_integer(worm_starts) && worm_starts>0)
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assert(is_finite(worm_arc) && worm_arc>0 && worm_arc<90)
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// assert(is_finite(worm_arc) && worm_arc>0 && worm_arc<90)
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assert(is_finite(crowning) && crowning>=0)
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assert(is_bool(left_handed))
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assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
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@ -3371,6 +3385,7 @@ 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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@ -3989,7 +4004,6 @@ function outer_radius(circ_pitch, teeth, clearance, internal=false, helical=0, p
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// root radius so that you can, for example, place a partial tooth gear onto a matching circle. The `backlash` parameter may seem
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// unnecessary, but when large pressure angle teeth are clipped, the value of backlash changes the clipping radius. For regular
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// gear teeth, `backlash` has no effect on the radius.
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// Arguments:
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// teeth = The number of teeth on the gear.
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// helical = The helical angle (from vertical) of the teeth on the gear. Default: 0
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@ -1975,7 +1975,7 @@ module teardrop_edge_mask(l, r, angle=45, excess=0.1, d, anchor=CTR, spin=0, ori
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// Module: polygon_edge_mask()
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// Symopsis: Converts a 2d mask to 3d mask suitable for a 3d edge
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// Synopsis: Extrudes a 2d mask polygon to an edge mask with a correct corner anchor
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// SynTags: Geom
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// Topics: Masks, Shapes (3D)
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// See Also: edge_profile(), edge_profile_asym(), diff()
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