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enabled circles and spokes on same gear, added option for entered hub and centered gear body, fixed additional test cases, improved test_gears to check more features

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skeptonomicon 2021-07-20 22:48:37 -04:00
parent 28fbdac168
commit 6f0ca2a57e
1 changed files with 73 additions and 33 deletions
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106
involute_gears.scad
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@ -307,9 +307,11 @@ module gear (
spoke_width=undef, spoke_width=undef,
spoke_thickness=undef, spoke_thickness=undef,
spoke_square=false, spoke_square=false,
z_symmetry=false, centered_gear=false,
centered_hub=false,
bore_diameter=undef, bore_diameter=undef,
circles=0, circles=0,
circle_diameter=undef,
backlash=0, backlash=0,
twist=0, twist=0,
involute_facets=0, involute_facets=0,
@ -355,9 +357,10 @@ module gear (
rim_width = (rim_width!=undef?rim_width:root_radius * .1); rim_width = (rim_width!=undef?rim_width:root_radius * .1);
rim_radius = root_radius - rim_width; rim_radius = root_radius - rim_width;
// Variables controlling the hub_diameter // Variables controlling the hub
hub_thickness = (hub_thickness!=undef?(hub_thickness!=0?hub_thickness:gear_thickness):gear_thickness * 2); hub_thickness = (hub_thickness!=undef?(hub_thickness!=0?hub_thickness:gear_thickness):gear_thickness * 2);
hub_diameter = (hub_diameter!=undef?hub_diameter:root_radius * .3); hub_diameter = (hub_diameter!=undef?hub_diameter:root_radius * .3);
hub_base = (centered_hub == false)? 0 : rim_thickness/2 - hub_thickness/2;
// Variables controlling the spokes // Variables controlling the spokes
spokes = spokes == undef? 0 : spokes; spokes = spokes == undef? 0 : spokes;
@ -372,19 +375,18 @@ module gear (
//echo (str("spoke_width: ",spoke_width,", hub_diameter: ",hub_diameter, ", spoke_depth: ",spoke_depth)); //echo (str("spoke_width: ",spoke_width,", hub_diameter: ",hub_diameter, ", spoke_depth: ",spoke_depth));
// Variables controlling the bore // Variables controlling the bore
bore_diameter = (bore_diameter!=undef?bore_diameter:root_radius * .1); bore_diameter = bore_diameter!=undef?bore_diameter:root_radius * .1;
// Variables controlling the circular holes in the gear. // Variables controlling the circular holes in the gear.
circles = spokes==0?circles:0;
circle_orbit_diameter=hub_diameter/2+rim_radius; circle_orbit_diameter=hub_diameter/2+rim_radius;
circle_orbit_curcumference=pi*circle_orbit_diameter; circle_orbit_curcumference=pi*circle_orbit_diameter;
// Limit the circle size to 90% of the gear face. // Limit the circle size to 90% of the gear face.
circle_diameter= circle_default_diameter = min (
min ( 0.70*circle_orbit_curcumference/circles,
0.70*circle_orbit_curcumference/circles, (rim_radius+hub_diameter/2)*0.9);
(rim_radius-hub_diameter/2)*0.9); circle_diameter=(circle_diameter != undef)? circle_diameter : circle_default_diameter;
echo(str("cir_orb_dia: ", circle_orbit_diameter, ", cir_orb_circumf: ", circle_orbit_curcumference, ", default cir dia: ",circle_default_diameter, ", cir_dia:",circle_diameter));
difference() difference()
{ {
union () union ()
@ -402,29 +404,54 @@ module gear (
half_thick_angle = half_thick_angle, half_thick_angle = half_thick_angle,
involute_facets=involute_facets); involute_facets=involute_facets);
//if we have a spoked gear, then the gear body must be removed. //if we have a 0 hub thickness, then hub must be removed
if (spokes>0) if (hub_thickness == 0)
translate ([0,0,-1]) translate ([0,0,-1])
cylinder (r=rim_radius,h=rim_thickness+2); cylinder (r=rim_radius,h=rim_thickness+2);
//if the rim is thicker than the gear, carve out the gear body //if the rim is thicker than the gear, carve out gear body
else if (rim_thickness>gear_thickness) else if (rim_thickness>gear_thickness){
translate ([0,0,gear_thickness]) //if not centered, carve out only the top
if (centered_gear == false){
translate ([0,0,gear_thickness])
cylinder (r=rim_radius,h=rim_thickness); cylinder (r=rim_radius,h=rim_thickness);
}
else
//carve out half from top and half from bottom
union ()
{
translate ([0,0,(gear_thickness + rim_thickness)/2])
cylinder (r=rim_radius,h=rim_thickness+1);
translate ([0,0,-1 -(gear_thickness + rim_thickness)/2])
cylinder (r=rim_radius,h=rim_thickness+1);
}
}
} }
//extend the gear body if gear_thickness > rim_thickness unless spoked, //extend the gear body if gear_thickness > rim_thickness unless spoked,
if (spokes==0 && gear_thickness > rim_thickness) if (gear_thickness > rim_thickness)
{ {
linear_extrude_flat_option(flat=flat, height=gear_thickness) if (centered_gear == false)
{
linear_extrude_flat_option(flat=flat, height=gear_thickness)
circle (r=rim_radius);
}
else
{
translate ([0,0,-(gear_thickness - rim_thickness)/2])
linear_extrude_flat_option(flat=flat, height=gear_thickness)
circle (r=rim_radius);
}
//if rim is thicker than body, body protrudes into rim //if rim is thicker than body, body protrudes into rim
circle (r=rim_radius);
} }
//add the hub //add the hub
translate ([0,0,hub_base])
linear_extrude_flat_option(flat=flat, height=hub_thickness) linear_extrude_flat_option(flat=flat, height=hub_thickness)
circle (r=hub_diameter/2); circle (r=hub_diameter/2);
//add in spokes //add in spokes
if (spokes>0) if (spokes>0)
{
for(i=[0:spokes-1]) for(i=[0:spokes-1])
translate([0,0,rim_thickness/2]) translate([0,0,rim_thickness/2])
rotate([90,0,i*360/spokes]) rotate([90,0,i*360/spokes])
@ -437,9 +464,10 @@ module gear (
} }
if (spoke_square==false){ if (spoke_square==false){
resize([spoke_width,spoke_thickness,spoke_length]) resize([spoke_width,spoke_thickness,spoke_length])
cylinder(h=1,d=1); cylinder(h=10,d=10);
} }
} }
}
} }
//remove the center bore //remove the center bore
@ -622,7 +650,13 @@ module test_gears()
{ {
gear (number_of_teeth=17, gear (number_of_teeth=17,
circular_pitch=500*pi/180, circular_pitch=500*pi/180,
circles=8); spokes=6,
spoke_thickness=4,
gear_thickness=0,
rim_thickness=5,
hub_thickness=5,
hub_diameter=10,
circles=0);
rotate ([0,0,360*4/17]) rotate ([0,0,360*4/17])
translate ([39.088888,0,0]) translate ([39.088888,0,0])
@ -657,8 +691,12 @@ module test_gears()
{ {
gear (number_of_teeth=27, gear (number_of_teeth=27,
circular_pitch=500*pi/180, circular_pitch=500*pi/180,
//circles=5, circles=6,
circle_diameter=12,
spokes=6, spokes=6,
gear_thickness=2,
hub_thickness=10,
centered_gear=true,
spoke_thickness=3, spoke_thickness=3,
hub_diameter=2*8.88888889); hub_diameter=2*8.88888889);
@ -674,6 +712,7 @@ module test_gears()
number_of_teeth=14, number_of_teeth=14,
circular_pitch=200*pi/180, circular_pitch=200*pi/180,
pressure_angle=5, pressure_angle=5,
twist=30,
clearance = 0.2, clearance = 0.2,
gear_thickness = 10, gear_thickness = 10,
rim_thickness = 10, rim_thickness = 10,
@ -682,17 +721,18 @@ module test_gears()
circles=0); circles=0);
translate ([13.8888888,0,1]) translate ([13.8888888,0,1])
gear ( gear (
number_of_teeth=11, number_of_teeth=10,
circular_pitch=200*pi/180, circular_pitch=200*pi/180,
pressure_angle=5, pressure_angle=5,
clearance = 0.2, clearance = 0.2,
gear_thickness = 10, gear_thickness = 10,
rim_thickness = 10, rim_thickness = 8,
twist=-30*8/10,
rim_width = 15, rim_width = 15,
hub_thickness = 20, hub_thickness = 10,
//hub_diameter=2*7.222222, centered_hub=true,
hub_diameter=8, hub_diameter=7,
bore_diameter=5, bore_diameter=4,
circles=0); circles=0);
} }
} }
@ -738,7 +778,7 @@ module test_double_helix_gear (
pressure_angle=30; pressure_angle=30;
gear (number_of_teeth=teeth, gear (number_of_teeth=teeth,
circular_pitch=700, circular_pitch=700*pi/180,
pressure_angle=pressure_angle, pressure_angle=pressure_angle,
clearance = 0.2, clearance = 0.2,
gear_thickness = height/2*0.5, gear_thickness = height/2*0.5,
@ -751,7 +791,7 @@ module test_double_helix_gear (
twist=twist/teeth); twist=twist/teeth);
mirror([0,0,1]) mirror([0,0,1])
gear (number_of_teeth=teeth, gear (number_of_teeth=teeth,
circular_pitch=700, circular_pitch=700*pi/180,
pressure_angle=pressure_angle, pressure_angle=pressure_angle,
clearance = 0.2, clearance = 0.2,
gear_thickness = height/2, gear_thickness = height/2,
@ -776,7 +816,7 @@ module test_backlash ()
rotate ([0,0,-360/teeth/4]) rotate ([0,0,-360/teeth/4])
gear ( gear (
number_of_teeth = teeth, number_of_teeth = teeth,
circular_pitch=700, circular_pitch=700*pi/180,
gear_thickness = 12, gear_thickness = 12,
rim_thickness = 15, rim_thickness = 15,
rim_width = 5, rim_width = 5,
@ -789,7 +829,7 @@ module test_backlash ()
rotate ([0,0,360/teeth/4]) rotate ([0,0,360/teeth/4])
gear ( gear (
number_of_teeth = teeth, number_of_teeth = teeth,
circular_pitch=700, circular_pitch=700*pi/180,
gear_thickness = 12, gear_thickness = 12,
rim_thickness = 15, rim_thickness = 15,
rim_width = 5, rim_width = 5,
@ -800,7 +840,7 @@ module test_backlash ()
circles=8); circles=8);
} }
color([0,0,128,0.5]) color([0,0,1,0.5])
translate([0,0,-5]) translate([0,0,-5])
cylinder ($fn=20,r=backlash / 4,h=25); cylinder ($fn=20,r=backlash / 4,h=25);
} }