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Partially toothed gears #24

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Partially toothed gears #24

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34 changes: 25 additions & 9 deletions involute_gears.scad
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Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,9 @@ module bevel_gear (
gear_thickness = 15,
backlash = 0,
involute_facets=0,
finish = -1)
finish = -1,
real_teeth=0
)
{
echo ("bevel_gear",
"teeth", number_of_teeth,
Expand All @@ -114,8 +116,11 @@ module bevel_gear (
// The height of the pitch apex.
pitch_apex = sqrt (pow (cone_distance, 2) - pow (outside_pitch_radius, 2));
pitch_angle = asin (outside_pitch_radius/cone_distance);

echo ("Num Teeth:", number_of_teeth, " Pitch Angle:", pitch_angle);

// Some control on real teeth value (if 0 we use number_of_teeth value)
real_teeth = real_teeth == 0 || real_teeth > number_of_teeth ? number_of_teeth : real_teeth;

echo ("Num Teeth:", number_of_teeth, " Pitch Angle:", pitch_angle, "Real teeth: ",real_teeth);

finish = (finish != -1) ? finish : (pitch_angle < 45) ? bevel_gear_flat : bevel_gear_back_cone;

Expand Down Expand Up @@ -176,8 +181,9 @@ module bevel_gear (
rotate (half_thick_angle)
translate ([0,0,pitch_apex-apex_to_apex])
cylinder ($fn=number_of_teeth*2, r1=root_cone_full_radius,r2=0,h=apex_to_apex);
for (i = [1:number_of_teeth])
// for (i = [1:1])


for (i = [1:real_teeth])
{
rotate ([0,0,i*360/number_of_teeth])
{
Expand Down Expand Up @@ -308,7 +314,9 @@ module gear (
backlash=0,
twist=0,
involute_facets=0,
flat=false)
flat=false,
real_teeth=0
)
{
if (circular_pitch==false && diametral_pitch==false)
echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch");
Expand All @@ -319,6 +327,7 @@ module gear (
// Pitch diameter: Diameter of pitch circle.
pitch_diameter = number_of_teeth * circular_pitch / 180;
pitch_radius = pitch_diameter/2;

echo ("Teeth:", number_of_teeth, " Pitch radius:", pitch_radius);

// Base Circle
Expand Down Expand Up @@ -368,7 +377,9 @@ module gear (
base_radius = base_radius,
outer_radius = outer_radius,
half_thick_angle = half_thick_angle,
involute_facets=involute_facets);
involute_facets=involute_facets,
real_teeth=real_teeth
);

if (gear_thickness < rim_thickness)
translate ([0,0,gear_thickness])
Expand Down Expand Up @@ -416,13 +427,18 @@ module gear_shape (
base_radius,
outer_radius,
half_thick_angle,
involute_facets)
involute_facets,
real_teeth=0
)
{
// Some control on real teeth value (if 0 we use number_of_teeth value)
real_teeth = real_teeth == 0 || real_teeth > number_of_teeth ? number_of_teeth : real_teeth;

union()
{
rotate (half_thick_angle) circle ($fn=number_of_teeth*2, r=root_radius);

for (i = [1:number_of_teeth])
for (i = [1:real_teeth])
{
rotate ([0,0,i*360/number_of_teeth])
{
Expand Down