fixed rack, fixed test_gears, and added spoked gears
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skeptonomicon
parent
4b4caeb5da
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28fbdac168
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@ -303,6 +303,11 @@ module gear (
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rim_width=undef,
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hub_thickness=undef,
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hub_diameter=undef,
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spokes=0,
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spoke_width=undef,
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spoke_thickness=undef,
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spoke_square=false,
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z_symmetry=false,
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bore_diameter=undef,
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circles=0,
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backlash=0,
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@ -354,10 +359,23 @@ module gear (
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hub_thickness = (hub_thickness!=undef?(hub_thickness!=0?hub_thickness:gear_thickness):gear_thickness * 2);
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hub_diameter = (hub_diameter!=undef?hub_diameter:root_radius * .3);
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// Variables controlling the spokes
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spokes = spokes == undef? 0 : spokes;
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spoke_thickness = (spoke_thickness == undef)? rim_thickness : spoke_thickness;
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spoke_width = (spokes==0)? 1 : (spoke_width == undef)? 0.75 * pi * hub_diameter / spokes : spoke_width;
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//spoke_depth is depth spoke must penetrate into hub to ensure complete penetration
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spoke_depth = ((hub_diameter/2)^2-(spoke_width/2)^2)^0.5 +.01;
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//spoke length is length of spoke including the depth sunk into the hub
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spoke_length = spoke_depth+rim_radius-(hub_diameter/2.0);
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//spoke raius is the distance from gear center to base of the spoke(inside the hub)
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spoke_radius = (hub_diameter/2.0)-spoke_depth;
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//echo (str("spoke_width: ",spoke_width,", hub_diameter: ",hub_diameter, ", spoke_depth: ",spoke_depth));
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// Variables controlling the bore
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bore_diameter = (bore_diameter!=undef?bore_diameter:root_radius * .1);
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// Variables controlling the circular holes in the gear.
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circles = spokes==0?circles:0;
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circle_orbit_diameter=hub_diameter/2+rim_radius;
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circle_orbit_curcumference=pi*circle_orbit_diameter;
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@ -373,6 +391,7 @@ module gear (
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{
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difference ()
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{
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//start with a plane toothed disk gear
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linear_extrude_flat_option(flat=flat, height=rim_thickness, convexity=10, twist=twist)
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gear_shape (
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number_of_teeth,
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@ -383,21 +402,52 @@ module gear (
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half_thick_angle = half_thick_angle,
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involute_facets=involute_facets);
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if (flat == false && gear_thickness < rim_thickness)
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//if we have a spoked gear, then the gear body must be removed.
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if (spokes>0)
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translate ([0,0,-1])
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cylinder (r=rim_radius,h=rim_thickness+2);
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//if the rim is thicker than the gear, carve out the gear body
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else if (rim_thickness>gear_thickness)
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translate ([0,0,gear_thickness])
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cylinder (r=rim_radius,h=rim_thickness-gear_thickness+1);
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cylinder (r=rim_radius,h=rim_thickness);
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}
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if (gear_thickness > rim_thickness)
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//extend the gear body if gear_thickness > rim_thickness unless spoked,
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if (spokes==0 && gear_thickness > rim_thickness)
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{
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linear_extrude_flat_option(flat=flat, height=gear_thickness)
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//if rim is thicker than body, body protrudes into rim
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circle (r=rim_radius);
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if (flat == false && hub_thickness > gear_thickness)
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translate ([0,0,gear_thickness])
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linear_extrude_flat_option(flat=flat, height=hub_thickness-gear_thickness)
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circle (r=hub_diameter/2);
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}
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//add the hub
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linear_extrude_flat_option(flat=flat, height=hub_thickness)
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circle (r=hub_diameter/2);
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//add in spokes
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if (spokes>0)
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for(i=[0:spokes-1])
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translate([0,0,rim_thickness/2])
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rotate([90,0,i*360/spokes])
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translate([0,0,spoke_radius])
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{
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if (spoke_square==true){
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resize([spoke_width,spoke_thickness,spoke_length])
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translate([0,0,.5])
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cube(1,center=true);
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}
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if (spoke_square==false){
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resize([spoke_width,spoke_thickness,spoke_length])
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cylinder(h=1,d=1);
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}
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}
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}
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//remove the center bore
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translate ([0,0,-1])
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linear_extrude_flat_option(flat =flat, height=2+max(rim_thickness,hub_thickness,gear_thickness))
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circle (r=bore_diameter/2);
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//remove circles from gear body
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if (circles>0)
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{
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for(i=[0:circles-1])
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@ -423,10 +473,10 @@ module rack(
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echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch");
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//Convert diametrial pitch to our native circular pitch
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circular_pitch = (circular_pitch!=false?circular_pitch:180/diametral_pitch);
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pitch = circular_pitch / 180 * PI;
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circular_pitch = (circular_pitch!=false?circular_pitch:pi/diametral_pitch);
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pitch = circular_pitch;
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addendum = circular_pitch / 180;
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addendum = circular_pitch / pi;
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dedendum = addendum + clearance;
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pitch_slope = tan(pressure_angle);
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@ -566,23 +616,25 @@ function involute (base_radius, involute_angle) =
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module test_gears()
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{
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$fs = 0.2;
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$fa =1;
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translate([17,-15])
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{
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gear (number_of_teeth=17,
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circular_pitch=500,
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circular_pitch=500*pi/180,
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circles=8);
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rotate ([0,0,360*4/17])
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translate ([39.088888,0,0])
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{
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gear (number_of_teeth=11,
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circular_pitch=500,
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circular_pitch=500*pi/180,
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hub_diameter=0,
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rim_width=65);
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translate ([0,0,8])
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{
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gear (number_of_teeth=6,
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circular_pitch=300,
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circular_pitch=300*pi/180,
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hub_diameter=0,
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rim_width=5,
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rim_thickness=6,
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@ -590,7 +642,7 @@ module test_gears()
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rotate ([0,0,360*5/6])
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translate ([22.5,0,1])
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gear (number_of_teeth=21,
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circular_pitch=300,
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circular_pitch=300*pi/180,
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bore_diameter=2,
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hub_diameter=4,
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rim_width=1,
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@ -604,21 +656,23 @@ module test_gears()
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translate ([-61.1111111,0,0])
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{
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gear (number_of_teeth=27,
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circular_pitch=500,
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circles=5,
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circular_pitch=500*pi/180,
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//circles=5,
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spokes=6,
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spoke_thickness=3,
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hub_diameter=2*8.88888889);
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translate ([-37.5,0,0])
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rotate ([0,0,-90])
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rack (
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circular_pitch=500
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circular_pitch=500*pi/180
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);
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translate ([0,0,10])
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{
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gear (
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number_of_teeth=14,
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circular_pitch=200,
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circular_pitch=200*pi/180,
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pressure_angle=5,
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clearance = 0.2,
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gear_thickness = 10,
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@ -629,14 +683,15 @@ module test_gears()
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translate ([13.8888888,0,1])
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gear (
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number_of_teeth=11,
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circular_pitch=200,
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circular_pitch=200*pi/180,
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pressure_angle=5,
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clearance = 0.2,
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gear_thickness = 10,
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rim_thickness = 10,
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rim_width = 15,
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hub_thickness = 20,
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hub_diameter=2*7.222222,
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//hub_diameter=2*7.222222,
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hub_diameter=8,
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bore_diameter=5,
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circles=0);
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}
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@ -645,7 +700,7 @@ module test_gears()
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rotate ([0,0,360*-5/17])
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translate ([44.444444444,0,0])
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gear (number_of_teeth=15,
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circular_pitch=500,
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circular_pitch=500*pi/180,
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hub_diameter=10,
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rim_width=5,
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rim_thickness=5,
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@ -656,7 +711,7 @@ module test_gears()
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rotate ([0,0,360*-1/17])
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translate ([30.5555555,0,-1])
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gear (number_of_teeth=5,
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circular_pitch=500,
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circular_pitch=500*pi/180,
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hub_diameter=0,
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rim_width=5,
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rim_thickness=10);
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@ -749,3 +804,4 @@ module test_backlash ()
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translate([0,0,-5])
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cylinder ($fn=20,r=backlash / 4,h=25);
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}
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