123 lines
3.7 KiB
OpenSCAD
123 lines
3.7 KiB
OpenSCAD
/* [Clamp Dimensions] */
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// Top arm length (mm)
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top_arm_length = 55; // [10:1:250]
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// Lower arm length (mm)
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lower_arm_length = 45; // [10:1:250]
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// Clamp height, i.e. distance between arms (mm)
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clamp_height = 85; // [5:1:250]
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// Width of the clamp (mm)
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clamp_width = 20; // [5:1:100]
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// Thickness of the clamp, i.e. more increases stability
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clamp_thickness = 3.0; // [1:0.5:6]
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/* [Clamp Features] */
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// Increases the grip by adding a pattern to the top arm
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with_texture = false;
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// Use S‐curve for the lower arm when enabled; otherwise, a straight lower arm is used.
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with_s_curve = true;
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// Helps to avoid stress fractures by adding a stress relief on the corner of the lower arm
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add_stress_relief = true;
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// Increase the back wall height by 1 mm if texture is enabled.
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effective_clamp_height = clamp_height + (with_texture ? 1 : 0);
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/* --- Function: S-Curve Center Line --- */
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function s_curve_y(x) = - (clamp_thickness / sqrt(3)) * sin(360 * x / lower_arm_length) + (clamp_thickness / 2);
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/* --- Module: S-Curve Lower Arm --- */
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module lower_arm_s_curve() {
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translate([clamp_thickness/2, clamp_thickness/2]) {
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num_segments = 100; // Increase for a smoother curve.
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union() {
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for (i = [0 : num_segments-1]) {
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x0 = lower_arm_length * i / num_segments;
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x1 = lower_arm_length * (i+1) / num_segments;
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y0 = s_curve_y(x0);
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y1 = s_curve_y(x1);
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hull() {
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translate([x0, y0])
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circle(r = clamp_thickness/2, $fn = 50);
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translate([x1, y1])
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circle(r = clamp_thickness/2, $fn = 50);
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}
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}
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}
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}
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}
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/* --- Module: Rounded Lower Arm (if S-curve is disabled) --- */
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module lower_arm_rounded() {
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translate([0, 0]) {
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union() {
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square([lower_arm_length, clamp_thickness]);
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intersection() {
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translate([lower_arm_length, clamp_thickness/2])
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circle(r = clamp_thickness/2, $fn = 50);
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translate([lower_arm_length, 0])
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square([clamp_thickness, clamp_thickness]);
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}
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}
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}
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}
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/* --- Module: Rounded Top Arm --- */
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module top_arm_rounded() {
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union() {
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square([top_arm_length, clamp_thickness]);
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intersection() {
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translate([top_arm_length, clamp_thickness/2])
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circle(r = clamp_thickness/2, $fn = 50);
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translate([top_arm_length, 0])
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square([clamp_thickness, clamp_thickness]);
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}
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}
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}
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difference() {
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$fn = 100;
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linear_extrude(height = clamp_width) {
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union() {
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// Lower Arm
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if (with_s_curve)
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lower_arm_s_curve();
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else
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lower_arm_rounded();
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// Back Wall
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translate([0, clamp_thickness])
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square([clamp_thickness, effective_clamp_height]);
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// Top Arm
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translate([0, clamp_thickness + effective_clamp_height])
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top_arm_rounded();
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// Optional Texture on the Top Arm's Inner Side
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if (with_texture) {
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texture_length = top_arm_length - clamp_thickness;
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for (i = [0 : texture_length - 1]) {
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translate([clamp_thickness + i, clamp_thickness + effective_clamp_height]) {
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hull() {
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polygon(points = [[0, 0], [1, 0], [0.5, -1]]);
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translate([0.01, 0])
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polygon(points = [[0, 0], [1, 0], [0.5, -1]]);
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}
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}
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}
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}
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}
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}
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// Subtractive Stress Relief
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if (add_stress_relief) {
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if (with_s_curve) {
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translate([clamp_thickness*1.1, clamp_thickness*1.5])
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linear_extrude(height = clamp_width + 1)
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circle(r = clamp_thickness * 0.3);
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} else {
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translate([clamp_thickness*1.1, clamp_thickness*1])
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linear_extrude(height = clamp_width + 1)
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circle(r = clamp_thickness * 0.3);
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}
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}
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}
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