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65 lines
1.8 KiB
OpenSCAD
65 lines
1.8 KiB
OpenSCAD
// Parametric screw-like things (ball screws, augers)
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// License: GNU LGPL 2.1 or later.
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// © 2010 by Elmo Mäntynen
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include <curves.scad>
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/* common screw parameter
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length
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pitch = length/rotations: the distance between the turns of the thread
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outside_diameter
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inner_diameter: thickness of the shaft
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*/
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//Uncomment to see examples
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//test_auger();
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//test_ball_groove();
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//test_ball_groove2();
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//test_ball_screw();
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module helix(pitch, length, slices=500){
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rotations = length/pitch;
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linear_extrude(height=length, center=false, convexity=10, twist=360*rotations, slices=slices, $fn=100)
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child(0);
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}
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module auger(pitch, length, outside_radius, inner_radius, taper_ratio = 0.25) {
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union(){
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helix(pitch, length)
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polygon(points=[[0,inner_radius],[outside_radius,(inner_radius * taper_ratio)],[outside_radius,(inner_radius * -1 * taper_ratio)],[0,(-1 * inner_radius)]], paths=[[0,1,2,3]]);
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cylinder(h=length, r=inner_radius);
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}
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}
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module test_auger(){translate([50, 0, 0]) auger(40, 80, 25, 5);}
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module ball_groove(pitch, length, diameter, ball_radius=10) {
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helix(pitch, length, slices=100)
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translate([diameter, 0, 0])
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circle(r = ball_radius);
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}
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module test_ball_groove(){ translate([0, 300, 0]) ball_groove(100, 300, 10);}
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module ball_groove2(pitch, length, diameter, ball_radius, slices=200){
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rotations = length/pitch;
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radius=diameter/2;
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offset = length/slices;
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union(){
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for (i = [0:slices]) {
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assign (z = i*offset){
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translate(helix_curve(pitch, radius, z)) sphere(ball_radius, $fa=5, $fs=1);
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}
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}
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}
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}
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module test_ball_groove2(){translate([0, 0, 0]) ball_groove2(100, 300, 100, 10);}
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module ball_screw(pitch, length, bearing_radius=2) {
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}
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module test_ball_screw(){}
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