Embedded Files
Parametric knob
Parametric knob
OpenScad code :
knob_radius_top = 22.2/2;
knob_radius_bottom = 26.2/2;//10;
knob_height = 16;
knob_smoothness = 120;
shaft_radius = 6/2;
shaft_height = 12;
shaft_smoothness = 120;
shaft_is_flatted = true;
flat_size_adjustment = -0.0;
// you won't need to mess with this. less than 5 makes it disappear. you can, however,
// set the adjustment to be a negative decimal if you need a flat but not as big as the default.
// go positive if you need a bigger flat
flat_size = 6;//5 + flat_size_adjustment;
// some potentiometers need to have their knobs affixed with a set screw.
set_screw = true;
set_screw_radius = 1.5;
set_screw_depth = 12;
set_screw_height = 4;
quality_of_set_screw = 20;
smoothing = true;
smoothing_radius = 1.5; // tweak on this one, how much smoothing to apply
smooth = 120; // tweak on this one, Number of facets of rounding cylinder
ct = -0.1; // circle translate? not sure.
circle_radius = knob_radius_top; // just match the top edge radius
circle_height = 1; // actually.. I don't know what this does.
pad = 0.2; // Padding to maintain manifold
//
// directional indicators
//
// this is a corner edge of a cube sticking out of the cylinder at the bottom
// you can use it instead of the arrow shaped cutout in the top if you like. Or both.
pointy_external_indicator = false;
pointy_external_indicator_height = 15;
pointy_external_indicator_pokey_outey_ness = -0.0; //
pokey_outey_value = pointy_external_indicator_pokey_outey_ness - 1 - pad;
pokey_outey = [pokey_outey_value, pokey_outey_value,0];
// there's an arrow shaped hole you can have. There aren't a lot of controls for this.
// please feel free to improve on this script here.
arrow_indicator = true;
arrow_indicator_scale = 0.8;
arrow_indicator_translate = [0,1,16];
arrow_scale_head = 2;
arrow_scale_shaft = 1.5;
//
// indentations
//
// for spherical indentations, set the quantity, quality, size, and adjust the placement
indentations_sphere = false;
sphere_number_of_indentations = 8;
sphere_quality_of_indentations = 50;
size_of_sphere_indentations = 1.5;
// the first number in this set moves the spheres in or out. smaller is closer to the middle
// the second number in this set moves the spheres left or right
// the third number in this set moves the speheres up or down
translation_of_sphere_indentations = [10,0,16];
// in case you are using an odd number of indentations, you way want to adjust the starting angle
// so that they align to the front or set screw locations.
sphere_starting_rotation = 0;
// for cylinder indentations, set quantity, quality, radius, height, and placement
indentations_cylinder = true;
cylinder_number_of_indentations = 8;
cylinder_quality_of_indentations = 120;
radius_of_cylinder_indentations_top = 3;
radius_of_cylinder_indentations_bottom = 2;
height_of_cylinder_indentations = 16;
translation_of_cylinder_indentations = [0.5,5,-6];
cylinder_starting_rotation = 0;//-33.3;
// these are some setup variables... you probably won't need to mess with them.
negative_knob_radius = knob_radius_bottom*-1;
// this is the main module. It calls the submodules.
make_the_knob();
module make_the_knob()
{
difference()
{
difference()
{
difference()
{
difference()
{
union()
{
difference()
{
// main cylinder
cylinder(r1=knob_radius_bottom,r2=knob_radius_top,h=knob_height, $fn=knob_smoothness);
smoothing();
}
external_direction_indicator();
}
shaft_hole();
}
set_screw_hole();
}
arrow_indicator();
indentations();
}
}
}
module smoothing() {
// smoothing the top
if(smoothing == true)
{
translate([0,0,knob_height])
rotate([180,0,0])
difference() {
rotate_extrude(convexity=10, $fn = smooth)
translate([circle_radius-ct-smoothing_radius+pad,ct-pad,0])
square(smoothing_radius+pad,smoothing_radius+pad);
rotate_extrude(convexity=10, $fn = smooth)
translate([circle_radius-ct-smoothing_radius,ct+smoothing_radius,0])
circle(r=smoothing_radius,$fn=smooth);
}
}
}
module external_direction_indicator() {
if(pointy_external_indicator == true)
{
// outer pointy indicator
rotate([0,0,45])
translate(pokey_outey)
// cube size of 8 minimum to point out
cube(size=[knob_radius_bottom,knob_radius_bottom,pointy_external_indicator_height],center=false);
}
}
module shaft_hole() {
// shaft hole
difference()
{
// round shaft hole
translate([ 0, 0, -1 ])
cylinder(r=shaft_radius,h=shaft_height, $fn=shaft_smoothness);
if(shaft_is_flatted == true)
{
// D shaft shape for shaft cutout
rotate( [0,0,90])
translate([-7.5,-5,0])
cube(size=[flat_size,10,13],center=false);
}
}
}
module set_screw_hole() {
if(set_screw == true)
{
// set screw hole
rotate ([90,0,0])
translate([ 0, set_screw_height, 1 ])
cylinder(r=set_screw_radius,h=set_screw_depth, $fn=quality_of_set_screw);
}
}
module arrow_indicator() {
if(arrow_indicator == true)
{
//translate(arrow_indicator_translate)
//translate([-10,0,0])
rotate([0,0,180])
// bottom hole
//cylinder(r=knob_radius_top-1.7/2, h=1.2, $fn=120, center=true);
//top holes
difference(){
translate([0,0,knob_height-1])
cylinder(r=knob_radius_top-3/2, h=5, $fn=120, center=false);
//point
translate([7,0,knob_height-1])
cylinder(r=1.5, h=5, $fn=120, center=false);
//}
//symbol
rotate([0,0,180])
difference(){
//big circle
translate([1,-1,knob_height-1])
cylinder(r=6, h=5, $fn=120, center=false);
// small circle
translate([-0.5,-1,knob_height-1])
cylinder(r=4.5, h=5, $fn=120, center=false);
translate([1,2,knob_height-1])
cube(size=[13,6,2],center=true);
}
}
}
}
module arrow_indicator_old() {
if(arrow_indicator == true)
{
translate(arrow_indicator_translate)
// begin arrow top cutout
// translate([(knob_radius/2),knob_height,knob_height])
rotate([90,0,45])
scale([arrow_indicator_scale*.3,arrow_indicator_scale*.3,arrow_indicator_scale*.3])
union()
{
rotate([90,45,0])
scale([arrow_scale_head,arrow_scale_head,1])
cylinder(r=8, h=10, $fn=3, center=true);
rotate([90,45,0])
translate([-10,0,0])
scale([arrow_scale_shaft,arrow_scale_shaft,1])
cube(size=[15,10,10],center=true);
}
}
}
module indentations() {
if(indentations_sphere == true)
{
for (z = [0:sphere_number_of_indentations])
{
rotate([0,0,sphere_starting_rotation+((360/sphere_number_of_indentations)*z)])
translate(translation_of_sphere_indentations)
sphere(size_of_sphere_indentations, $fn=sphere_quality_of_indentations);
}
}
if(indentations_cylinder == true)
{
for (z = [0:cylinder_number_of_indentations])
{
rotate([0,0,cylinder_starting_rotation+((360/cylinder_number_of_indentations)*z)])
translate([negative_knob_radius,0,knob_height])
translate(translation_of_cylinder_indentations)
cylinder(r1=radius_of_cylinder_indentations_bottom, r2=radius_of_cylinder_indentations_top, h=height_of_cylinder_indentations, center=true, $fn=cylinder_quality_of_indentations);
}
}
}
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