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misc gear fixes
This commit is contained in:
Adrian Mariano
parent
804d57bf29
commit
792277a3fa
1 changed files with 54 additions and 78 deletions
132
gears.scad
132
gears.scad
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@ -52,7 +52,7 @@ function _inherit_gear_pitch(fname,pitch,circ_pitch,diam_pitch,mod,warn=true) =
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pitch_value(diam_pitch=diam_pitch) :
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mod != undef?
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assert(is_finite(mod) && mod>0)
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pitch_value(mod) :
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circular_pitch(mod=mod) :
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$parent_gear_pitch != undef? $parent_gear_pitch :
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5;
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@ -348,7 +348,7 @@ function _inherit_gear_thickness(thickness) =
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// ps2=auto_profile_shift(teeth=teeth1);
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// mod=3;
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// d = gear_dist(mod=mod, teeth1=teeth1, teeth2=teeth2,profile_shift1=ps1, profile_shift2=ps2,helical=0, internal2=true);
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// ang = 1;
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// ang = .5;
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// color_overlaps(){
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// ring_gear2d(mod=mod, teeth=teeth2,profile_shift=ps2,helical=0,backing=4);
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// zrot(ang*360/teeth2)
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@ -417,7 +417,7 @@ function _inherit_gear_thickness(thickness) =
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
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// internal = If true, create a mask for difference()ing from something else.
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// profile_shift = Profile shift factor x.
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// profile_shift = Profile shift factor x. Default: "auto"
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// herringbone = If true, and helical is set, creates a herringbone gear.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
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@ -551,7 +551,7 @@ function spur_gear(
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helical,
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interior,
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internal,
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profile_shift,
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profile_shift="auto",
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slices,
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herringbone=false,
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diam_pitch,
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@ -569,7 +569,7 @@ function spur_gear(
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PA = _inherit_gear_pa(pressure_angle),
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helical = _inherit_gear_helical(helical, invert=!internal),
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thickness = _inherit_gear_thickness(thickness),
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA,helical))
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profile_shift = auto_profile_shift(teeth,PA,helical,profile_shift=profile_shift)
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)
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assert(is_integer(teeth) && teeth>3)
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assert(is_finite(thickness) && thickness>0)
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@ -626,7 +626,7 @@ module spur_gear(
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helical,
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internal,
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interior,
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profile_shift,
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profile_shift="auto",
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slices,
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herringbone=false,
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pitch,
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@ -643,7 +643,7 @@ module spur_gear(
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PA = _inherit_gear_pa(pressure_angle);
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helical = _inherit_gear_helical(helical, invert=!internal);
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thickness = _inherit_gear_thickness(thickness);
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA,helical));
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profile_shift = auto_profile_shift(teeth,PA,helical,profile_shift=profile_shift);
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checks =
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assert(is_integer(teeth) && teeth>3)
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assert(is_finite(thickness) && thickness>0)
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@ -747,7 +747,7 @@ module spur_gear(
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle
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// helical = The angle of the rack teeth away from perpendicular to the gear axis of rotation. Stretches out the tooth shapes. Used to match helical spur gear pinions. Default: 0
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// internal = If true, create a mask for difference()ing from something else.
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// profile_shift = Profile shift factor x.
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// profile_shift = Profile shift factor x. Default: "auto"
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// shaft_diam = If given, the diameter of the central shaft hole.
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
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@ -819,7 +819,7 @@ function spur_gear2d(
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backlash = 0.0,
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internal,
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interior,
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profile_shift,
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profile_shift="auto",
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helical,
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shaft_diam = 0,
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pitch,
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@ -834,7 +834,7 @@ function spur_gear2d(
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circ_pitch = _inherit_gear_pitch("spur_gear2d()", pitch, circ_pitch, diam_pitch, mod),
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PA = _inherit_gear_pa(pressure_angle),
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helical = _inherit_gear_helical(helical, invert=!internal),
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA,helical))
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profile_shift = auto_profile_shift(teeth,PA,helical,profile_shift=profile_shift)
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)
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assert(is_integer(teeth) && teeth>3)
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assert(is_finite(shaft_diam) && shaft_diam>=0)
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@ -842,7 +842,6 @@ function spur_gear2d(
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assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
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assert(clearance==undef || (is_finite(clearance) && clearance>=0))
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assert(is_finite(backlash) && backlash>=0)
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assert(is_finite(profile_shift) && abs(profile_shift)<1)
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assert(is_finite(helical) && abs(helical)<90)
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assert(is_finite(gear_spin))
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let(
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@ -879,7 +878,7 @@ module spur_gear2d(
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backlash = 0.0,
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internal,
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interior,
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profile_shift,
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profile_shift="auto",
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helical,
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shaft_diam = 0,
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pitch,
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@ -894,7 +893,7 @@ module spur_gear2d(
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circ_pitch = _inherit_gear_pitch("spur_gear2d()", pitch, circ_pitch, diam_pitch, mod);
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PA = _inherit_gear_pa(pressure_angle);
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helical = _inherit_gear_helical(helical, invert=!internal);
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA,helical));
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profile_shift = auto_profile_shift(teeth,PA,helical,profile_shift=profile_shift);
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checks =
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assert(is_integer(teeth) && teeth>3)
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assert(is_finite(shaft_diam) && shaft_diam>=0)
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@ -902,7 +901,6 @@ module spur_gear2d(
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assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
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assert(clearance==undef || (is_finite(clearance) && clearance>=0))
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assert(is_finite(backlash) && backlash>=0)
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assert(is_finite(profile_shift) && abs(profile_shift)<1)
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assert(is_finite(helical) && abs(helical)<90)
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assert(is_finite(gear_spin));
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rgn = spur_gear2d(
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@ -961,7 +959,7 @@ module spur_gear2d(
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// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees.
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// helical = The angle of the rack teeth away from perpendicular to the gear axis of rotation. Stretches out the tooth shapes. Used to match helical spur gear pinions. Default: 0
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// herringbone = If true, and helical is set, creates a herringbone gear.
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// profile_shift = Profile shift factor x for tooth profile.
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// profile_shift = Profile shift factor x for tooth profile. Default: 0
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// clearance = Gap between top of a tooth on one gear and bottom of valley on a meshing gear (in millimeters)
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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@ -990,7 +988,7 @@ module ring_gear(
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pressure_angle,
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helical,
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herringbone = false,
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profile_shift,
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profile_shift=0,
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clearance,
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backlash = 0.0,
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or,od,width,
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@ -1007,8 +1005,8 @@ module ring_gear(
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PA = _inherit_gear_pa(pressure_angle);
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helical = _inherit_gear_helical(helical);
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thickness = _inherit_gear_thickness(thickness);
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA,helical));
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checks =
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assert(is_finite(profile_shift), "Profile shift for ring gears must be numerical")
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assert(is_integer(teeth) && teeth>3)
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assert(is_finite(thickness) && thickness>0)
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assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
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@ -1107,7 +1105,7 @@ module ring_gear(
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// width = width of the ring, measuring from tips of teeth to outside of ring.
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// helical = The angle of the rack teeth away from perpendicular to the gear axis of rotation. Stretches out the tooth shapes. Used to match helical spur gear pinions. Default: 0
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// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees.
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// profile_shift = Profile shift factor x for tooth profile.
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// profile_shift = Profile shift factor x for tooth profile. Default: 0
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// clearance = Gap between top of a tooth on one gear and bottom of valley on a meshing gear (in millimeters)
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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@ -1136,7 +1134,7 @@ module ring_gear2d(
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backing,
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pressure_angle,
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helical,
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profile_shift,
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profile_shift=0,
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clearance,
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backlash = 0.0,
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or,od,width,
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@ -1150,15 +1148,14 @@ module ring_gear2d(
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circ_pitch = _inherit_gear_pitch("ring_gear2d()",pitch, circ_pitch, diam_pitch, mod);
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PA = _inherit_gear_pa(pressure_angle);
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helical = _inherit_gear_helical(helical);
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA,helical));
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checks =
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assert(is_finite(profile_shift), "Profile shift for ring gears must be numerical")
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assert(is_integer(teeth) && teeth>3)
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assert(num_defined([backing,or,od,width])<=1, "Cannot define more than one of backing, or, od and width")
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assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
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assert(is_finite(helical) && abs(helical)<90)
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assert(clearance==undef || (is_finite(clearance) && clearance>=0))
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assert(is_finite(backlash) && backlash>=0)
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assert(is_finite(profile_shift) && abs(profile_shift)<1)
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assert(is_finite(gear_spin));
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pr = pitch_radius(circ_pitch, teeth, helical=helical);
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ar = outer_radius(circ_pitch, teeth, helical=helical, profile_shift=profile_shift, internal=true);
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@ -1232,7 +1229,7 @@ module ring_gear2d(
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// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// helical = The angle of the rack teeth away from perpendicular to the rack length. Used to match helical spur gear pinions. Default: 0
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// profile_shift = Profile shift factor x.
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// profile_shift = Profile shift factor x. Default: 0
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// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees. Default: 20
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle. Default: 0
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// clearance = Clearance gap at the bottom of the inter-tooth valleys. Default: module/4
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@ -1473,7 +1470,7 @@ function rack(
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// helical = The angle of the rack teeth away from perpendicular to the rack length. Stretches out the tooth shapes. Used to match helical spur gear pinions. Default: 0
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// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees.
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// profile_shift = Profile shift factor x for tooth shape.
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// profile_shift = Profile shift factor x for tooth shape. Default: 0
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle
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// clearance = Clearance gap at the bottom of the inter-tooth valleys. Default: module/4
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// gear_travel = The distance the rack should be moved by linearly. Default: 0
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@ -1966,7 +1963,7 @@ module bevel_gear(
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// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees. Default: 20
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle. Default: 0
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// clearance = Clearance gap at the bottom of the inter-tooth valleys. Default: module/4
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// profile_shift = Profile shift factor x.
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// profile_shift = Profile shift factor x. Default: "auto"
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
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@ -1990,7 +1987,7 @@ function worm(
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pressure_angle,
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backlash=0,
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clearance,
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profile_shift,
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profile_shift="auto",
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diam_pitch,
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mod,
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pitch,
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@ -2075,7 +2072,7 @@ module worm(
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) {
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circ_pitch = _inherit_gear_pitch("worm()", pitch, circ_pitch, diam_pitch, mod);
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PA = _inherit_gear_pa(pressure_angle);
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profile_shift = default(profile_shift, auto_profile_shift(starts,PA));
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profile_shift = auto_profile_shift(starts,PA,profile_shift=profile_shift);
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checks =
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assert(is_integer(starts) && starts>0)
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assert(is_finite(l) && l>0)
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@ -2130,7 +2127,7 @@ module worm(
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// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees. Default: 20
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// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle. Default: 0
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// clearance = Clearance gap at the bottom of the inter-tooth valleys. Default: module/4
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// profile_shift = Profile shift factor x.
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// profile_shift = Profile shift factor x. Default: "auto"
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// slices = The number of vertical slices to refine the curve of the worm throat. Default: 10
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
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@ -2189,7 +2186,7 @@ function worm_gear(
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pressure_angle,
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backlash = 0,
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clearance,
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profile_shift,
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profile_shift="auto",
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slices = 10,
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gear_spin=0,
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pitch,
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@ -2203,7 +2200,7 @@ function worm_gear(
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let(
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circ_pitch = _inherit_gear_pitch("worm_gear()", pitch, circ_pitch, diam_pitch, mod),
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PA = _inherit_gear_pa(pressure_angle),
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA))
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profile_shift = auto_profile_shift(teeth,PA,profile_shift=profile_shift)
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)
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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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@ -2301,7 +2298,7 @@ module worm_gear(
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backlash = 0,
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shaft_diam = 0,
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slices = 10,
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profile_shift,
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profile_shift="auto",
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gear_spin=0,
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pitch,
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diam_pitch,
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@ -2312,7 +2309,7 @@ module worm_gear(
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) {
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circ_pitch = _inherit_gear_pitch("worm_gear()", pitch, circ_pitch, diam_pitch, mod);
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PA = _inherit_gear_pa(pressure_angle);
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profile_shift = default(profile_shift, auto_profile_shift(teeth,PA));
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profile_shift = auto_profile_shift(teeth,PA,profile_shift=profile_shift);
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checks =
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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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@ -2565,7 +2562,7 @@ function _gear_tooth_profile(
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// Function: circular_pitch()
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// Synopsis: Returns tooth density expressed as "circular pitch".
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// Topics: Gears, Parts
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), pitch_value(), module_value()
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), module_value()
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// Usage:
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// circ_pitch = circular_pitch(circ_pitch);
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// circ_pitch = circular_pitch(mod=);
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@ -2610,7 +2607,7 @@ function circular_pitch(circ_pitch, mod, pitch, diam_pitch) =
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// Function: diametral_pitch()
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// Synopsis: Returns tooth density expressed as "diametral pitch".
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// Topics: Gears, Parts
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), pitch_value(), module_value()
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), module_value()
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// Usage:
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// dp = diametral_pitch(circ_pitch);
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// dp = diametral_pitch(mod=);
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@ -2634,37 +2631,10 @@ function diametral_pitch(circ_pitch, mod, pitch, diam_pitch) =
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PI / circ_pitch / INCH;
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// Function: pitch_value()
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// Synopsis: Returns tooth density expressed as "circular pitch".
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// Topics: Gears, Parts
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), pitch_value(), module_value()
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// Usage:
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// circ_pitch = pitch_value(mod);
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// circ_pitch = pitch_value(circ_pitch=);
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// circ_pitch = pitch_value(diam_pitch=);
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// Description:
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// Returns the circular pitch in mm from module/modulus or diametral pitch.
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// The circular pitch of a gear is the number of millimeters per tooth around the pitch radius circle.
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// For example, if you have a gear with 11 teeth, and the pitch diameter is 35mm, then the circumfrence
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// of the pitch diameter is really close to 110mm, making the circular pitch of that gear about 10mm/tooth.
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// Arguments:
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// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
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// ---
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// circ_pitch = The circular pitch, or distance in mm between teeth around the pitch circle.
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// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
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// Example:
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// circ_pitch = pitch_value(mod=2);
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// circ_pitch = pitch_value(circ_pitch=8);
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// circ_pitch = pitch_value(diam_pitch=16);
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function pitch_value(mod, circ_pitch, diam_pitch) =
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circular_pitch(mod=mod, circ_pitch=circ_pitch, diam_pitch=diam_pitch);
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// Function: module_value()
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// Synopsis: Returns tooth density expressed as "module" or "modulus" in millimeters.
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// Topics: Gears, Parts
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), pitch_value(), module_value()
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// See Also: spur_gear(), diametral_pitch(), circular_pitch(), module_value()
|
||||
// Usage:
|
||||
// mod = module_value(circ_pitch);
|
||||
// mod = module_value(mod=);
|
||||
|
|
@ -2698,7 +2668,7 @@ function module_value(circ_pitch, mod, pitch, diam_pitch) =
|
|||
/// The height of the top of a gear tooth above the pitch radius circle.
|
||||
/// Arguments:
|
||||
/// circ_pitch = The circular pitch, or distance between teeth around the pitch circle, in mm.
|
||||
/// profile_shift = Profile shift factor x.
|
||||
/// profile_shift = Profile shift factor x. Default: 0
|
||||
/// ---
|
||||
/// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
|
||||
/// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
|
||||
|
|
@ -2737,7 +2707,7 @@ function _adendum(
|
|||
/// Arguments:
|
||||
/// circ_pitch = The circular pitch, or distance between teeth around the pitch circle, in mm.
|
||||
/// clearance = If given, sets the clearance between meshing teeth. Default: module/4
|
||||
/// profile_shift = Profile shift factor x.
|
||||
/// profile_shift = Profile shift factor x. Default: 0
|
||||
/// ---
|
||||
/// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
|
||||
/// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
|
||||
|
|
@ -2771,7 +2741,7 @@ function _dedendum(
|
|||
// Function: pitch_radius()
|
||||
// Synopsis: Returns the pitch radius for a gear.
|
||||
// Topics: Gears, Parts
|
||||
// See Also: spur_gear(), diametral_pitch(), circular_pitch(), pitch_value(), module_value(), outer_radius()
|
||||
// See Also: spur_gear(), diametral_pitch(), circular_pitch(), module_value(), outer_radius()
|
||||
// Usage:
|
||||
// pr = pitch_radius(pitch, teeth, [helical]);
|
||||
// pr = pitch_radius(mod=, teeth=, [helical=]);
|
||||
|
|
@ -2820,19 +2790,21 @@ function pitch_radius(
|
|||
// Function: outer_radius()
|
||||
// Synopsis: Returns the outer radius for a gear.
|
||||
// Topics: Gears, Parts
|
||||
// See Also: spur_gear(), diametral_pitch(), circular_pitch(), pitch_value(), module_value(), pitch_radius(), outer_radius()
|
||||
// See Also: spur_gear(), diametral_pitch(), circular_pitch(), module_value(), pitch_radius(), outer_radius()
|
||||
// Usage:
|
||||
// or = outer_radius(circ_pitch, teeth, [helical=], [clearance=], [internal=], [profile_shift=]);
|
||||
// or = outer_radius(mod=, teeth=, [helical=], [clearance=], [internal=], [profile_shift=]);
|
||||
// or = outer_radius(diam_pitch=, teeth=, [helical=], [clearance=], [internal=], [profile_shift=]);
|
||||
// Description:
|
||||
// Calculates the outer radius for the gear. The gear fits entirely within a cylinder of this radius.
|
||||
// Calculates the outer radius for the gear. The gear fits entirely within a cylinder of this radius, unless
|
||||
// it has been strongly profile shifted, in which case it will be undersized due to tip clipping.
|
||||
// This function does not apply automatic profile shifting.
|
||||
// Arguments:
|
||||
// circ_pitch = The circular pitch, or distance between teeth around the pitch circle, in mm.
|
||||
// teeth = The number of teeth on the gear.
|
||||
// ---
|
||||
// clearance = If given, sets the clearance between meshing teeth. Default: module/4
|
||||
// profile_shift = Profile shift factor x.
|
||||
// profile_shift = Profile shift factor x. Default: 0
|
||||
// internal = If true, calculate for an internal gear.
|
||||
// helical = The helical angle (from vertical) of the teeth on the gear. Default: 0
|
||||
// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
|
||||
|
|
@ -2872,7 +2844,7 @@ function outer_radius(circ_pitch, teeth, clearance, internal=false, helical=0, p
|
|||
/// rr = _root_radius(mod=, teeth=, [helical=], [clearance=], [internal=], [profile_shift=]);
|
||||
/// Topics: Gears
|
||||
/// Description:
|
||||
/// Calculates the root radius for the gear, at the base of the dedendum.
|
||||
/// Calculates the root radius for the gear, at the base of the dedendum. Does not apply auto profile shifting.
|
||||
/// Arguments:
|
||||
/// circ_pitch = The circular pitch, or distance between teeth around the pitch circle, in mm.
|
||||
/// teeth = The number of teeth on the gear.
|
||||
|
|
@ -2880,7 +2852,7 @@ function outer_radius(circ_pitch, teeth, clearance, internal=false, helical=0, p
|
|||
/// clearance = If given, sets the clearance between meshing teeth. Default: module/4
|
||||
/// internal = If true, calculate for an internal gear.
|
||||
/// helical = The helical angle (from vertical) of the teeth on the gear. Default: 0
|
||||
/// profile_shift = Profile shift factor x.
|
||||
/// profile_shift = Profile shift factor x. Default:0
|
||||
/// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
|
||||
/// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
|
||||
/// Example:
|
||||
|
|
@ -3099,8 +3071,8 @@ function gear_dist(
|
|||
assert(!(internal1 || internal2) || (teeth1>0 && teeth2>0), "Cannot specify internal gear with rack (zero tooth count)")
|
||||
let(
|
||||
mod = module_value(mod=mod,circ_pitch= circ_pitch, diam_pitch=diam_pitch),
|
||||
profile_shift1 = default(profile_shift1, auto_profile_shift(teeth1,pressure_angle,helical)),
|
||||
profile_shift2 = default(profile_shift2, auto_profile_shift(teeth2,pressure_angle,helical)),
|
||||
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),
|
||||
teeth1 = internal2? -teeth1 : teeth1,
|
||||
teeth2 = internal1? -teeth2 : teeth2
|
||||
)
|
||||
|
|
@ -3181,8 +3153,8 @@ function gear_dist_skew(teeth1,teeth2,helical1,helical2,profile_shift1,profile_s
|
|||
assert(all_nonnegative([teeth1,teeth2]),"Must give nonnegative values for teeth")
|
||||
assert(teeth1>0 || teeth2>0, "One of the teeth counts must be nonzero")
|
||||
let(
|
||||
profile_shift1 = default(profile_shift1, auto_profile_shift(teeth1,pressure_angle,helical1)),
|
||||
profile_shift2 = default(profile_shift2, auto_profile_shift(teeth2,pressure_angle,helical2)),
|
||||
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),
|
||||
mod = module_value(circ_pitch=circ_pitch, diam_pitch=diam_pitch, mod=mod)
|
||||
)
|
||||
teeth1==0 || teeth2==0? pitch_radius(mod=mod, teeth=teeth1+teeth2, helical=teeth1?helical1:helical2) + (profile_shift1+profile_shift2)*mod
|
||||
|
|
@ -3222,8 +3194,8 @@ function gear_skew_angle(teeth1,teeth2,helical1,helical2,profile_shift1,profile_
|
|||
assert(all_nonnegative([teeth1,teeth2]),"Must give nonnegative values for teeth")
|
||||
assert(teeth1>0 || teeth2>0, "One of the teeth counts must be nonzero")
|
||||
let(
|
||||
profile_shift1 = default(profile_shift1, auto_profile_shift(teeth1,pressure_angle,helical1)),
|
||||
profile_shift2 = default(profile_shift2, auto_profile_shift(teeth2,pressure_angle,helical2))
|
||||
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)
|
||||
)
|
||||
profile_shift1==0 && profile_shift2==0 ? helical1+helical2
|
||||
: teeth1==0 || teeth2==0 ? helical1+helical2
|
||||
|
|
@ -3278,10 +3250,14 @@ function get_profile_shift(desired,circ_pitch,teeth1,teeth2,pressure_angle=20,mo
|
|||
// helical = helical angle
|
||||
// ---
|
||||
// min_teeth = If given, the minimum number of teeth on a gear that has acceptable undercut.
|
||||
// profile_shift = If numerical then just return this value; if "auto" or not given then compute the automatic profile shift.
|
||||
|
||||
function auto_profile_shift(teeth, pressure_angle=20, helical=0, min_teeth) =
|
||||
teeth==0 ? 0:
|
||||
let(
|
||||
|
||||
function auto_profile_shift(teeth, pressure_angle=20, helical=0, min_teeth, profile_shift) =
|
||||
assert(is_undef(profile_shift) || is_finite(profile_shift) || profile_shift=="auto", "Profile shift must be \"auto\" or a number")
|
||||
is_num(profile_shift) ? profile_shift
|
||||
: teeth==0 ? 0
|
||||
: let(
|
||||
pressure_angle=atan(tan(pressure_angle)/cos(helical)),
|
||||
min_teeth = is_undef(min_teeth)
|
||||
? 2 / pow(sin(pressure_angle),2)
|
||||
|
|
|
|||
Loading…
Reference in a new issue