From 794dc51489e10525802d5320db57127a4cad4acd Mon Sep 17 00:00:00 2001 From: Adrian Mariano Date: Wed, 2 Aug 2023 18:22:01 -0400 Subject: [PATCH] fix examples and defaults --- gears.scad | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/gears.scad b/gears.scad index 238462f..4bfab83 100644 --- a/gears.scad +++ b/gears.scad @@ -3203,8 +3203,8 @@ function _working_pressure_angle(teeth1,profile_shift1, teeth2, profile_shift2, // teeth2 = Total number of teeth in the second gear. If given 0, we assume this is a rack or worm. // helical1 = The helical angle (from vertical) of the teeth on the first gear. // helical1 = The helical angle (from vertical) of the teeth on the second gear. -// profile_shift1 = Profile shift factor x for the first gear. Default: 0 -// profile_shift2 = Profile shift factor x for the second gear. Default: 0 +// profile_shift1 = Profile shift factor x for the first gear. Default: "auto" +// profile_shift2 = Profile shift factor x for the second gear. Default: "auto" // -- // 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. @@ -3242,7 +3242,7 @@ function _working_normal_pressure_angle_skew(teeth1,profile_shift1,helical1, tee // Function: gear_skew_angle() // Usage: -// ang = gear_skew_angle(mod=|diam_pitch=|circ_pitch=, teeth1, teeth2, helical1, helical2, [profile_shift1], [profile_shift2], [pressure_angle=] +// ang = gear_skew_angle(teeth1, teeth2, helical1, helical2, [profile_shift1], [profile_shift2], [pressure_angle=] // Description: // Compute the correct skew angle between the axes of two profile shifted helical gears. When profile shifting is zero, or when one of // the gears is a rack, this angle is simply the sum of the helical angles of the two gears. But with profile shifted gears, a small @@ -3252,14 +3252,14 @@ function _working_normal_pressure_angle_skew(teeth1,profile_shift1,helical1, tee // teeth2 = Total number of teeth in the second gear. If given 0, we assume this is a rack or worm. // helical1 = The helical angle (from vertical) of the teeth on the first gear. // helical1 = The helical angle (from vertical) of the teeth on the second gear. -// profile_shift1 = Profile shift factor x for the first gear. Default: 0 -// profile_shift2 = Profile shift factor x for the second gear. Default: 0 +// 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. // Example(3D,Med,NoAxes,VPT=[-2.62091,2.01048,-1.31405],VPR=[55,0,25],VPD=74.4017): These gears are auto profile shifted and as a result, do not mesh at the sum of their helical angles, but at 2.5 degrees more. // circ_pitch=5; teeth1=12; teeth2=7; ha1=25; ha2=30; thick=10; // d = gear_dist_skew(circ_pitch=circ_pitch, teeth1, teeth2, ha1, ha2); -// ang = gear_skew_angle(circ_pitch=circ_pitch, teeth1, teeth2, helical1=ha1, helical2=ha2); // Returns 57.7 +// ang = gear_skew_angle(teeth1, teeth2, helical1=ha1, helical2=ha2); // Returns 57.7 // left(d/2) // spur_gear(circ_pitch, teeth1, helical=ha1, thickness=thick, gear_spin=-90); // right(d/2) color("lightblue") @@ -3399,8 +3399,8 @@ function auto_profile_shift(teeth, pressure_angle=20, helical=0, min_teeth, prof // teeth1 = number of teeth on first gear // teeth2 = number of teeth on second gear // helical = The helical angle (from vertical) of the teeth on the gear. Default: 0 -// profile_shift1 = Profile shift factor x for the first gear. Default: 0 -// profile_shift2 = Profile shift factor x for the second gear. Default: 0 +// 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 = normal pressure angle of gear teeth. Default: 20 // Example(2D,Med,VPT=[53.9088,1.83058,26.0319],VPR=[0,0,0],VPD=140): Big profile shift eliminates the clearance between the teeth @@ -3426,7 +3426,7 @@ function auto_profile_shift(teeth, pressure_angle=20, helical=0, min_teeth, prof // spur_gear2d(mod=mod,teeth=teeth1,profile_shift=ps1,shorten=shorten,gear_spin=-90); // 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=0,profile_shift2=0,pressure_angle=20) = +function gear_shorten(teeth1,teeth2,helical=0,profile_shift1="auto",profile_shift2="auto",pressure_angle=20) = let( ax = gear_dist(mod=1,teeth1,teeth2,helical,profile_shift1,profile_shift2,pressure_angle=pressure_angle), y = ax - (teeth1+teeth2)/2/cos(helical) @@ -3448,11 +3448,11 @@ function gear_shorten(teeth1,teeth2,helical=0,profile_shift1=0,profile_shift2=0, // teeth2 = Total number of teeth in the second gear. If given 0, we assume this is a rack or worm. // helical1 = The helical angle (from vertical) of the teeth on the first gear. // helical1 = The helical angle (from vertical) of the teeth on the second gear. -// profile_shift1 = Profile shift factor x for the first gear. Default: 0 -// profile_shift2 = Profile shift factor x for the second gear. Default: 0 +// 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=0,profile_shift2=0,pressure_angle=20) = +function gear_shorten_skew(teeth1,teeth2,helical1,helical2,profile_shift1="auto",profile_shift2="auto",pressure_angle=20) = let( ax = gear_dist(mod=1,teeth1,teeth2,helical,profile_shift1,profile_shift2,pressure_angle=pressure_angle), y = ax - (teeth1+teeth2)/2/cos(helical)