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Changed screw_knob() facets to be suitable for 3D printing.

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Fixed knob_height() so it can take a screw as a type.
This commit is contained in:
Chris Palmer 2022-06-14 15:08:20 +01:00
parent 66f793b00b
commit 630268d71a
3 changed files with 11 additions and 4 deletions
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13
printed/screw_knob.scad
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@ -19,6 +19,8 @@
//
//! Knob with embedded hex head screw.
//!
//! Most aspects can be customised, e.g. the flange thickness and radius. It can also be solid or just a wall and be wavey edged or fluted.
//
include <../core.scad>
use <../utils/hanging_hole.scad>
@ -37,7 +39,9 @@ function screw_knob(screw, wall = 2, stem_h = 6, flange_t = 4, flange_r = 9, sol
[screw, wall, stem_h, flange_t, flange_r, solid, waves, wave_amp, fluted];
function knob_nut_trap_depth(screw) = round_to_layer(screw_head_height(screw));
function knob_height(type) = screw_knob_stem_h(type) + screw_knob_flange_t(type); //! Total height of the knob
function knob_height(type) = //! Total height of the knob
let(type = !is_list(type[0]) ? screw_knob(type) : type)
screw_knob_stem_h(type) + screw_knob_flange_t(type);
module screw_knob(type) { //! Generate the STL for a knob to fit the specified hex screw
type = !is_list(type[0]) ? screw_knob(type) : type; // Allow just the screw to be specified for backwards compatability
@ -52,13 +56,14 @@ module screw_knob(type) { //! Generate the STL for a knob to fit the specified h
waves = screw_knob_waves(type);
function wave(a) = flange_r - amp / 2 + sin(a * waves) * amp / 2;
points = [for(a = [0 : 359]) wave(a) * [sin(a), cos(a)]];
fn = r2sides(flange_r);
points = [for(i = [0 : fn - 1], a = i * 360 / fn) wave(a) * [sin(a), cos(a)]];
solid = screw_knob_solid(type);
module shape()
if(screw_knob_fluted(type))
difference() {
circle(flange_r, $fn = 360);
circle4n(flange_r);
c = flange_r * sin(90 / waves); // Flute half chord
d = flange_r - flange_r * cos(90 / waves); // Distance from chord to perimeter
@ -67,7 +72,7 @@ module screw_knob(type) { //! Generate the STL for a knob to fit the specified h
for(i = [0 : waves - 1])
rotate(360 * i / waves)
translate([0, flange_r - amp + flute_r])
circle(flute_r, $fn = 360);
circle4n(flute_r);
}
else
polygon(points);

2
readme.md
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@ -5916,6 +5916,8 @@ Clamp for ribbon cable and polypropylene strip or one or more ribbon cables.
## Screw_knob
Knob with embedded hex head screw.
Most aspects can be customised, e.g. the flange thickness and radius. It can also be solid or just a wall and be wavey edged or fluted.
[printed/screw_knob.scad](printed/screw_knob.scad) Implementation.
[tests/screw_knob.scad](tests/screw_knob.scad) Code for this example.

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tests/png/screw_knob.png
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