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Merge pull request #1237 from adrianVmariano/master

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mostly doc tweaks
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Revar Desmera 2023-08-03 17:21:10 -07:00 committed by GitHub
commit 347a45f416
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1 changed files with 11 additions and 6 deletions
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17
gears.scad
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@ -3181,7 +3181,7 @@ function _working_pressure_angle(teeth1,profile_shift1, teeth2, profile_shift2,
)
assert(rhs>0, "Total profile shift is too small, so working pressure angle is negative, and no valid gear separation exists")
let(
pa_eff = root_find(function (x) _invol(x)-rhs, -40, 75)
pa_eff = root_find(function (x) _invol(x)-rhs, 1, 75)
)
pa_eff;
@ -3311,9 +3311,9 @@ function gear_skew_angle(teeth1,teeth2,helical1,helical2,profile_shift1,profile_
// mod=4;
// desired=115;
// pshift = get_profile_shift(desired,teeth1,teeth2,mod=mod); // Returns 0.82
// shorten = pshift - (desired-112)/mod; // Returns 0.07
// ps1 = pshift/2;
// ps2 = pshift/2;
// shorten=gear_shorten(teeth1,teeth2,0,ps1,ps2); // Returns 0.07
// d = gear_dist(mod=mod, teeth1,teeth2,0,ps1,ps2);
// spur_gear2d(mod=mod,teeth=teeth1,profile_shift=ps1,shorten=shorten,gear_spin=-90,shaft_diam=5);
// right(d)
@ -3325,9 +3325,9 @@ function gear_skew_angle(teeth1,teeth2,helical1,helical2,profile_shift1,profile_
// mod=4;
// desired=110;
// pshift = get_profile_shift(desired,teeth1,teeth2,mod=mod); // Returns -0.46
// shorten = pshift - (desired-112)/mod; // Returns 0.04
// ps1 = 0.8*pshift;
// ps2 = 0.2*pshift;
// shorten=gear_shorten(teeth1,teeth2,0,ps1,ps2); // Returns 0.04
// d = gear_dist(mod=mod, teeth1,teeth2,0,ps1,ps2);
// spur_gear2d(mod=mod,teeth=teeth1,profile_shift=ps1,shorten=shorten,gear_spin=-90,shaft_diam=5);
// right(d)
@ -3409,7 +3409,7 @@ function auto_profile_shift(teeth, pressure_angle=20, helical=0, min_teeth, prof
// spur_gear2d(mod=mod,teeth=teeth1,profile_shift=ps1,gear_spin=-90);
// right(d)
// spur_gear2d(mod=mod,teeth=teeth2,profile_shift=ps2,gear_spin=-90);
// Example(2D,Med,VPT=[53.9088,1.83058,26.0319],VPR=[0,0,0],VPD=140): Applying the correct shortening factor restores the clearance to its normal value.
// Example(2D,Med,VPT=[53.9088,1.83058,26.0319],VPR=[0,0,0],VPD=140,NoAxes): Applying the correct shortening factor restores the clearance to its normal value.
// teeth1=25;
// teeth2=19;
// mod=4;
@ -3422,7 +3422,10 @@ function auto_profile_shift(teeth, pressure_angle=20, helical=0, min_teeth, prof
// right(d)
// spur_gear2d(mod=mod,teeth=teeth2,profile_shift=ps2,shorten=shorten,gear_spin=-90);
function gear_shorten(teeth1,teeth2,helical=0,profile_shift1="auto",profile_shift2="auto",pressure_angle=20) =
let(
teeth1==0 || teeth2==0 ? 0
: let(
profile_shift1 = auto_profile_shift(teeth1,pressure_angle,helical,profile_shift=profile_shift1),
profile_shift2 = auto_profile_shift(teeth2,pressure_angle,helical,profile_shift=profile_shift2),
ax = gear_dist(mod=1,teeth1,teeth2,helical,profile_shift1,profile_shift2,pressure_angle=pressure_angle),
y = ax - (teeth1+teeth2)/2/cos(helical)
)
@ -3445,10 +3448,12 @@ function gear_shorten(teeth1,teeth2,helical=0,profile_shift1="auto",profile_shif
// helical1 = The helical angle (from vertical) of the teeth on the second gear.
// profile_shift1 = Profile shift factor x for the first gear. Default: "auto"
// profile_shift2 = Profile shift factor x for the second gear. Default: "auto"
// --
// ---
// pressure_angle = The pressure angle of the gear.
function gear_shorten_skew(teeth1,teeth2,helical1,helical2,profile_shift1="auto",profile_shift2="auto",pressure_angle=20) =
let(
profile_shift1 = auto_profile_shift(teeth1,pressure_angle,helical1,profile_shift=profile_shift1),
profile_shift2 = auto_profile_shift(teeth2,pressure_angle,helical2,profile_shift=profile_shift2),
ax = gear_dist(mod=1,teeth1,teeth2,helical,profile_shift1,profile_shift2,pressure_angle=pressure_angle),
y = ax - (teeth1+teeth2)/2/cos(helical)
)