Migrate libraries into ./libraries directory
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include <./threads.scad>;
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include <../libraries/threads.scad>;
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//https://www.thingiverse.com/thing:186660
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//https://www.thingiverse.com/thing:186660
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include <./path_extrude.scad>;
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include <../libraries/path_extrude.scad>;
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SPOKE_COUNT = 24;
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SPOKE_COUNT = 24;
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include <./threads.scad>;
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include <../libraries/threads.scad>;
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//https://www.thingiverse.com/thing:186660
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//https://www.thingiverse.com/thing:186660
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include <./path_extrude.scad>;
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include <../libraries/path_extrude.scad>;
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$fn = 20;
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$fn = 20;
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// path_extrude.scad -- Extrude a path in 3D space
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// usage: add "use <path_extrude.scad>;" to the top of your OpenSCAD source code
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// Copyright (C) 2014-2019 David Eccles (gringer) <bioinformatics@gringene.org>
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// Determine the projection of a point on a plane centered at c1 with normal n1
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function project(p, c, n) =
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p - (n * (p - c)) * n / (n * n);
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// determine angle between two points with a given normal orientation
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// see https://stackoverflow.com/questions/14066933/
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// direct-way-of-computing-clockwise-angle-between-2-vectors
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// dot = p1 * p2;
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// det = (p1[0]*p2[1]*n1[2] + p2[0]*n1[1]*p1[2] + n1[0]*p1[1]*p2[2]) -
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// (n1[0]*p2[1]*p1[2] + p1[0]*n1[1]*p2[2] + p2[0]*p1[1]*n1[2]);
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// atan2(det, dot);
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// determine angle between two planar points and a centre
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// with a given normal orientation
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function getPlanarAngle(p1, p2, c1, n1) =
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let(p1 = p1-c1, n1=n1 / norm(n1), p2=p2-c1)
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atan2((p1[0]*p2[1]*n1[2] + p2[0]*n1[1]*p1[2] + n1[0]*p1[1]*p2[2]) -
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(n1[0]*p2[1]*p1[2] + p1[0]*n1[1]*p2[2] + p2[0]*p1[1]*n1[2]), p1 * p2);
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function c3D(tPoints) =
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(len(tPoints[0]) == undef) ? // single point
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c3D([tPoints])[0] :
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(len(tPoints[0]) < 3) ? // collection of 2D points
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tPoints * [[1,0,0],[0,1,0]] :
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tPoints; // 3D points
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// translate a point (or points)
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function myTranslate(ofs, points, acc = []) =
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(len(points[0]) == undef) ?
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myTranslate(ofs, [points])[0] :
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[ for(i = [0:(len(points) - 1)])
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[ for(d = [0:(len(points[0])-1)]) (ofs[d] + points[i][d])]];
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// rotate a point (or points)
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function myRotate(rotVec, points) =
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let(rotX = [[1, 0, 0],
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[0, cos(rotVec[0]), -sin(rotVec[0])],
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[0, sin(rotVec[0]), cos(rotVec[0])]],
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rotY = [[ cos(rotVec[1]), 0,-sin(rotVec[1])],
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[ 0, 1, 0],
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[ sin(rotVec[1]), 0, cos(rotVec[1])]],
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rotZ = [[ cos(rotVec[2]), sin(rotVec[2]), 0],
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[ sin(rotVec[2]), -cos(rotVec[2]), 0],
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[0, 0, 1]])
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(len(points[0]) == undef) ?
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myRotate(rotVec, [points])[0] :
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c3D(points) * rotX * rotY * rotZ;
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// Determine spherical rotation for cartesian coordinates
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function rToS(pt) =
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[-acos((pt[2]) / norm(pt)),
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0,
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-atan2(pt[0],pt[1])];
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function calcPreRot(p1, p2, p3) =
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let(n1=p2-p1, // normal between the two points (i.e. the plane that the polygon sits on)
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n2=p3-p2,
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rt1=rToS(n1),
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rt2=rToS(n2),
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pj1=(p2 + myRotate(rt2, [[1e42,0,0]])[0]),
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pj2=project(p=(p1 + myRotate(rt1, [[1e42,0,0]])[0]), c=p2, n=n2))
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getPlanarAngle(p1=pj1, p2=pj2, c1=p2, n1=n2);
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function cumSum(x, res=[]) =
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(len(x) == len(res)) ? concat([0], res) :
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(len(res) == 0) ? cumSum(x=x, res=[x[0]]) :
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cumSum(x=x, res=concat(res, [x[len(res)] + res[len(res)-1]]));
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// Create extrusion side panels for one polygon segment as triangles.
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// Note: panels are not necessarily be planar due to path twists
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function makeSides(shs, pts, ofs=0) =
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concat(
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[for(i=[0:(shs-1)]) [i+ofs, ((i+1) % shs + ofs + shs) % (shs * pts),
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(i+1) % shs + ofs]],
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[for(i=[0:(shs-1)]) [((i+1) % shs + ofs + shs) % (shs * pts),
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i+ofs, (i + ofs + shs) % (shs * pts)]]);
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// Concatenate the contents of the outermost list
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function flatten(A, acc = [], aDone = 0) =
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(aDone >= len(A)) ? acc :
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flatten(A, acc=concat(acc, A[aDone]), aDone = aDone + 1);
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// Linearly interpolate between two shapes
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function makeTween(shape1, shape2, t) =
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(t == 0) ? shape1 :
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(t == 1) ? shape2 :
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[for (i=[0:(len(shape1)-1)])
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(shape1[i]*(1-t) + shape2[i % len(shape2)]*(t))];
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// Extrude a 2D shape through a 3D path
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// Note: merge has two effects:
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// 1) Removes end caps
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// 2) Adjusts the rotation of each path point
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// so that the end and start match up
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module path_extrude(exPath, exShape, exShape2=[],
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exRots = [0], exScale = [1], merge=false, preRotate=true){
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exShapeTween = (len(exShape2) == 0) ?
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exShape : exShape2;
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shs = len(exShape); // shs: shape size
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pts = len(exPath); // pts: path size
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exPathX = (merge) ? concat(exPath, [exPath[0], exPath[1]]) :
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concat(exPath,
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[exPath[pts-1] + (exPath[pts-1] - exPath[pts-2]),
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exPath[pts-1] + 2*(exPath[pts-1] - exPath[pts-2])]);
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exScaleX = (len(exScale) == len(exPath)) ? exScale :
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[for (i = [0:(pts-1)]) exScale[i % len(exScale)]];
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preRots = [for(i = [0:(pts-1)])
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preRotate ?
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calcPreRot(p1=exPathX[i], // "current" point on the path
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p2=exPathX[(i+1)], // "next" point on the path
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p3=exPathX[(i+2)]) :
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0 ];
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cumPreRots = cumSum(preRots);
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seDiff = cumPreRots[len(cumPreRots)-1]; // rotation difference (start - end)
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// rotation adjustment to get start to look like end
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seAdj = -seDiff / (len(cumPreRots));
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adjPreRots = (!merge) ? cumPreRots :
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[for(i = [0:(pts-1)]) (cumPreRots[i] + seAdj * i)];
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adjExRots = (len(exRots) == 1) ?
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[for(i = [0:(len(adjPreRots)-1)]) (adjPreRots[i] + exRots[0])] :
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[for(i = [0:(len(adjPreRots)-1)]) (adjPreRots[i] + exRots[i % len(exRots)])];
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phPoints = flatten([
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for(i = [0:(pts-1)])
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let(p1=exPathX[i],
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p2=exPathX[(i+1)],
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n1=p2-p1, // normal between the two points
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rt1=rToS(n1))
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myTranslate(p1, myRotate(rt1, myRotate([0,0,-adjExRots[i]],
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c3D(makeTween(exShape, exShapeTween, i / (pts-1)) *
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exScaleX[i]))))
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]);
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if(merge){ // just the surface, no end caps
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polyhedron(points=phPoints,
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faces=flatten([
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for(i = [0:(pts-1)])
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makeSides(shs, pts, ofs=shs*i)
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])
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);
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} else {
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polyhedron(points=phPoints,
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faces=concat(
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flatten([
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for(i = [0:(pts-2)])
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makeSides(shs, pts, ofs=shs*i)
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]),
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concat( // add in start / end covers
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[[for(i= [0:(shs-1)]) i]],
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[[for(i= [(len(phPoints)-1):-1:(len(phPoints)-shs)]) i]]
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)
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));
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}
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}
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myPathTrefoil = [ for(t = [0:(360 / 101):359]) [ // trefoil knot
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5*(.41*cos(t) - .18*sin(t) - .83*cos(2*t) - .83*sin(2*t) -
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.11*cos(3*t) + .27*sin(3*t)),
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5*(.36*cos(t) + .27*sin(t) - 1.13*cos(2*t) + .30*sin(2*t) +
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.11*cos(3*t) - .27*sin(3*t)),
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5*(.45*sin(t) - .30*cos(2*t) +1.13*sin(2*t) -
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.11*cos(3*t) + .27*sin(3*t))] ];
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myPointsOctagon =
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let(ofs1=15)
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[ for(t = [0:(360/8):359])
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((t==90)?1:2) * [cos(t+ofs1),sin(t+ofs1)]];
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myPointsChunkOctagon =
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let(ofs1=15)
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[ for(t = [0:(360/8):359])
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((t==90)?0.4:1.9) *
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[cos((t * 135/360 + 45)+ofs1+45)+0.5,sin((t * 135/360 + 45)+ofs1+45)]];
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//myPoints = [ for(t = [0:(360/8):359]) 2 * [cos(t+45),sin(t+45)]];
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pts=[2,0,0.5];
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/*translate([0,0,0]) {
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path_extrude(exRots = [$t*360], exShape=myPointsOctagon,
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exPath=myPathTrefoil, merge=true);
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}*/
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/*
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* ISO-standard metric threads, following this specification:
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* http://en.wikipedia.org/wiki/ISO_metric_screw_thread
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*
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* Copyright 2017 Dan Kirshner - dan_kirshner@yahoo.com
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* See <http://www.gnu.org/licenses/>.
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*
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* Version 2.3. 2017-08-31 Default for leadin: 0 (best for internal threads).
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* Version 2.2. 2017-01-01 Correction for angle; leadfac option. (Thanks to
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* Andrew Allen <a2intl@gmail.com>.)
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* Version 2.1. 2016-12-04 Chamfer bottom end (low-z); leadin option.
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* Version 2.0. 2016-11-05 Backwards compatibility (earlier OpenSCAD) fixes.
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* Version 1.9. 2016-07-03 Option: tapered.
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* Version 1.8. 2016-01-08 Option: (non-standard) angle.
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* Version 1.7. 2015-11-28 Larger x-increment - for small-diameters.
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* Version 1.6. 2015-09-01 Options: square threads, rectangular threads.
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* Version 1.5. 2015-06-12 Options: thread_size, groove.
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* Version 1.4. 2014-10-17 Use "faces" instead of "triangles" for polyhedron
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* Version 1.3. 2013-12-01 Correct loop over turns -- don't have early cut-off
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* Version 1.2. 2012-09-09 Use discrete polyhedra rather than linear_extrude ()
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* Version 1.1. 2012-09-07 Corrected to right-hand threads!
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*/
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// Examples.
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//
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// Standard M8 x 1.
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// metric_thread (diameter=8, pitch=1, length=4);
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// Square thread.
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// metric_thread (diameter=8, pitch=1, length=4, square=true);
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// Non-standard: long pitch, same thread size.
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//metric_thread (diameter=8, pitch=4, length=4, thread_size=1, groove=true);
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// Non-standard: 20 mm diameter, long pitch, square "trough" width 3 mm,
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// depth 1 mm.
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//metric_thread (diameter=20, pitch=8, length=16, square=true, thread_size=6,
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// groove=true, rectangle=0.333);
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// English: 1/4 x 20.
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//english_thread (diameter=1/4, threads_per_inch=20, length=1);
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// Tapered. Example -- pipe size 3/4" -- per:
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// http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html
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// english_thread (diameter=1.05, threads_per_inch=14, length=3/4, taper=1/16);
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// Thread for mounting on Rohloff hub.
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//difference () {
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// cylinder (r=20, h=10, $fn=100);
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//
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// metric_thread (diameter=34, pitch=1, length=10, internal=true, n_starts=6);
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//}
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// ----------------------------------------------------------------------------
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function segments (diameter) = min (50, ceil (diameter*6));
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// ----------------------------------------------------------------------------
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// diameter - outside diameter of threads in mm. Default: 8.
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// pitch - thread axial "travel" per turn in mm. Default: 1.
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// length - overall axial length of thread in mm. Default: 1.
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// internal - true = clearances for internal thread (e.g., a nut).
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// false = clearances for external thread (e.g., a bolt).
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// (Internal threads should be "cut out" from a solid using
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// difference ()).
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// n_starts - Number of thread starts (e.g., DNA, a "double helix," has
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// n_starts=2). See wikipedia Screw_thread.
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// thread_size - (non-standard) axial width of a single thread "V" - independent
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// of pitch. Default: same as pitch.
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// groove - (non-standard) subtract inverted "V" from cylinder (rather than
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// add protruding "V" to cylinder).
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// square - Square threads (per
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// https://en.wikipedia.org/wiki/Square_thread_form).
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// rectangle - (non-standard) "Rectangular" thread - ratio depth/(axial) width
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// Default: 1 (square).
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// angle - (non-standard) angle (deg) of thread side from perpendicular to
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// axis (default = standard = 30 degrees).
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// taper - diameter change per length (National Pipe Thread/ANSI B1.20.1
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// is 1" diameter per 16" length). Taper decreases from 'diameter'
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// as z increases.
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// leadin - 0 (default): no chamfer; 1: chamfer (45 degree) at max-z end;
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// 2: chamfer at both ends, 3: chamfer at z=0 end.
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|
||||||
// leadfac - scale of leadin chamfer (default: 1.0 = 1/2 thread).
|
|
||||||
module metric_thread (diameter=8, pitch=1, length=1, internal=false, n_starts=1,
|
|
||||||
thread_size=-1, groove=false, square=false, rectangle=0,
|
|
||||||
angle=30, taper=0, leadin=0, leadfac=1.0)
|
|
||||||
{
|
|
||||||
// thread_size: size of thread "V" different than travel per turn (pitch).
|
|
||||||
// Default: same as pitch.
|
|
||||||
local_thread_size = thread_size == -1 ? pitch : thread_size;
|
|
||||||
local_rectangle = rectangle ? rectangle : 1;
|
|
||||||
|
|
||||||
n_segments = segments (diameter);
|
|
||||||
h = (square || rectangle) ? local_thread_size*local_rectangle/2 : local_thread_size / (2 * tan(angle));
|
|
||||||
|
|
||||||
h_fac1 = (square || rectangle) ? 0.90 : 0.625;
|
|
||||||
|
|
||||||
// External thread includes additional relief.
|
|
||||||
h_fac2 = (square || rectangle) ? 0.95 : 5.3/8;
|
|
||||||
|
|
||||||
tapered_diameter = diameter - length*taper;
|
|
||||||
|
|
||||||
difference () {
|
|
||||||
union () {
|
|
||||||
if (! groove) {
|
|
||||||
metric_thread_turns (diameter, pitch, length, internal, n_starts,
|
|
||||||
local_thread_size, groove, square, rectangle, angle,
|
|
||||||
taper);
|
|
||||||
}
|
|
||||||
|
|
||||||
difference () {
|
|
||||||
|
|
||||||
// Solid center, including Dmin truncation.
|
|
||||||
if (groove) {
|
|
||||||
cylinder (r1=diameter/2, r2=tapered_diameter/2,
|
|
||||||
h=length, $fn=n_segments);
|
|
||||||
} else if (internal) {
|
|
||||||
cylinder (r1=diameter/2 - h*h_fac1, r2=tapered_diameter/2 - h*h_fac1,
|
|
||||||
h=length, $fn=n_segments);
|
|
||||||
} else {
|
|
||||||
|
|
||||||
// External thread.
|
|
||||||
cylinder (r1=diameter/2 - h*h_fac2, r2=tapered_diameter/2 - h*h_fac2,
|
|
||||||
h=length, $fn=n_segments);
|
|
||||||
}
|
|
||||||
|
|
||||||
if (groove) {
|
|
||||||
metric_thread_turns (diameter, pitch, length, internal, n_starts,
|
|
||||||
local_thread_size, groove, square, rectangle,
|
|
||||||
angle, taper);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// chamfer z=0 end if leadin is 2 or 3
|
|
||||||
if (leadin == 2 || leadin == 3) {
|
|
||||||
difference () {
|
|
||||||
cylinder (r=diameter/2 + 1, h=h*h_fac1*leadfac, $fn=n_segments);
|
|
||||||
|
|
||||||
cylinder (r2=diameter/2, r1=diameter/2 - h*h_fac1*leadfac, h=h*h_fac1*leadfac,
|
|
||||||
$fn=n_segments);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// chamfer z-max end if leadin is 1 or 2.
|
|
||||||
if (leadin == 1 || leadin == 2) {
|
|
||||||
translate ([0, 0, length + 0.05 - h*h_fac1*leadfac]) {
|
|
||||||
difference () {
|
|
||||||
cylinder (r=diameter/2 + 1, h=h*h_fac1*leadfac, $fn=n_segments);
|
|
||||||
cylinder (r1=tapered_diameter/2, r2=tapered_diameter/2 - h*h_fac1*leadfac, h=h*h_fac1*leadfac,
|
|
||||||
$fn=n_segments);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
// ----------------------------------------------------------------------------
|
|
||||||
// Input units in inches.
|
|
||||||
// Note: units of measure in drawing are mm!
|
|
||||||
module english_thread (diameter=0.25, threads_per_inch=20, length=1,
|
|
||||||
internal=false, n_starts=1, thread_size=-1, groove=false,
|
|
||||||
square=false, rectangle=0, angle=30, taper=0, leadin=0,
|
|
||||||
leadfac=1.0)
|
|
||||||
{
|
|
||||||
// Convert to mm.
|
|
||||||
mm_diameter = diameter*25.4;
|
|
||||||
mm_pitch = (1.0/threads_per_inch)*25.4;
|
|
||||||
mm_length = length*25.4;
|
|
||||||
|
|
||||||
echo (str ("mm_diameter: ", mm_diameter));
|
|
||||||
echo (str ("mm_pitch: ", mm_pitch));
|
|
||||||
echo (str ("mm_length: ", mm_length));
|
|
||||||
metric_thread (mm_diameter, mm_pitch, mm_length, internal, n_starts,
|
|
||||||
thread_size, groove, square, rectangle, angle, taper, leadin,
|
|
||||||
leadfac);
|
|
||||||
}
|
|
||||||
|
|
||||||
// ----------------------------------------------------------------------------
|
|
||||||
module metric_thread_turns (diameter, pitch, length, internal, n_starts,
|
|
||||||
thread_size, groove, square, rectangle, angle,
|
|
||||||
taper)
|
|
||||||
{
|
|
||||||
// Number of turns needed.
|
|
||||||
n_turns = floor (length/pitch);
|
|
||||||
|
|
||||||
intersection () {
|
|
||||||
|
|
||||||
// Start one below z = 0. Gives an extra turn at each end.
|
|
||||||
for (i=[-1*n_starts : n_turns+1]) {
|
|
||||||
translate ([0, 0, i*pitch]) {
|
|
||||||
metric_thread_turn (diameter, pitch, internal, n_starts,
|
|
||||||
thread_size, groove, square, rectangle, angle,
|
|
||||||
taper, i*pitch);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// Cut to length.
|
|
||||||
translate ([0, 0, length/2]) {
|
|
||||||
cube ([diameter*3, diameter*3, length], center=true);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
// ----------------------------------------------------------------------------
|
|
||||||
module metric_thread_turn (diameter, pitch, internal, n_starts, thread_size,
|
|
||||||
groove, square, rectangle, angle, taper, z)
|
|
||||||
{
|
|
||||||
n_segments = segments (diameter);
|
|
||||||
fraction_circle = 1.0/n_segments;
|
|
||||||
for (i=[0 : n_segments-1]) {
|
|
||||||
rotate ([0, 0, i*360*fraction_circle]) {
|
|
||||||
translate ([0, 0, i*n_starts*pitch*fraction_circle]) {
|
|
||||||
//current_diameter = diameter - taper*(z + i*n_starts*pitch*fraction_circle);
|
|
||||||
thread_polyhedron ((diameter - taper*(z + i*n_starts*pitch*fraction_circle))/2,
|
|
||||||
pitch, internal, n_starts, thread_size, groove,
|
|
||||||
square, rectangle, angle);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
// ----------------------------------------------------------------------------
|
|
||||||
module thread_polyhedron (radius, pitch, internal, n_starts, thread_size,
|
|
||||||
groove, square, rectangle, angle)
|
|
||||||
{
|
|
||||||
n_segments = segments (radius*2);
|
|
||||||
fraction_circle = 1.0/n_segments;
|
|
||||||
|
|
||||||
local_rectangle = rectangle ? rectangle : 1;
|
|
||||||
|
|
||||||
h = (square || rectangle) ? thread_size*local_rectangle/2 : thread_size / (2 * tan(angle));
|
|
||||||
outer_r = radius + (internal ? h/20 : 0); // Adds internal relief.
|
|
||||||
//echo (str ("outer_r: ", outer_r));
|
|
||||||
|
|
||||||
// A little extra on square thread -- make sure overlaps cylinder.
|
|
||||||
h_fac1 = (square || rectangle) ? 1.1 : 0.875;
|
|
||||||
inner_r = radius - h*h_fac1; // Does NOT do Dmin_truncation - do later with
|
|
||||||
// cylinder.
|
|
||||||
|
|
||||||
translate_y = groove ? outer_r + inner_r : 0;
|
|
||||||
reflect_x = groove ? 1 : 0;
|
|
||||||
|
|
||||||
// Make these just slightly bigger (keep in proportion) so polyhedra will
|
|
||||||
// overlap.
|
|
||||||
x_incr_outer = (! groove ? outer_r : inner_r) * fraction_circle * 2 * PI * 1.02;
|
|
||||||
x_incr_inner = (! groove ? inner_r : outer_r) * fraction_circle * 2 * PI * 1.02;
|
|
||||||
z_incr = n_starts * pitch * fraction_circle * 1.005;
|
|
||||||
|
|
||||||
/*
|
|
||||||
(angles x0 and x3 inner are actually 60 deg)
|
|
||||||
|
|
||||||
/\ (x2_inner, z2_inner) [2]
|
|
||||||
/ \
|
|
||||||
(x3_inner, z3_inner) / \
|
|
||||||
[3] \ \
|
|
||||||
|\ \ (x2_outer, z2_outer) [6]
|
|
||||||
| \ /
|
|
||||||
| \ /|
|
|
||||||
z |[7]\/ / (x1_outer, z1_outer) [5]
|
|
||||||
| | | /
|
|
||||||
| x | |/
|
|
||||||
| / | / (x0_outer, z0_outer) [4]
|
|
||||||
| / | / (behind: (x1_inner, z1_inner) [1]
|
|
||||||
|/ | /
|
|
||||||
y________| |/
|
|
||||||
(r) / (x0_inner, z0_inner) [0]
|
|
||||||
|
|
||||||
*/
|
|
||||||
|
|
||||||
x1_outer = outer_r * fraction_circle * 2 * PI;
|
|
||||||
|
|
||||||
z0_outer = (outer_r - inner_r) * tan(angle);
|
|
||||||
//echo (str ("z0_outer: ", z0_outer));
|
|
||||||
|
|
||||||
//polygon ([[inner_r, 0], [outer_r, z0_outer],
|
|
||||||
// [outer_r, 0.5*pitch], [inner_r, 0.5*pitch]]);
|
|
||||||
z1_outer = z0_outer + z_incr;
|
|
||||||
|
|
||||||
// Give internal square threads some clearance in the z direction, too.
|
|
||||||
bottom = internal ? 0.235 : 0.25;
|
|
||||||
top = internal ? 0.765 : 0.75;
|
|
||||||
|
|
||||||
translate ([0, translate_y, 0]) {
|
|
||||||
mirror ([reflect_x, 0, 0]) {
|
|
||||||
|
|
||||||
if (square || rectangle) {
|
|
||||||
|
|
||||||
// Rule for face ordering: look at polyhedron from outside: points must
|
|
||||||
// be in clockwise order.
|
|
||||||
polyhedron (
|
|
||||||
points = [
|
|
||||||
[-x_incr_inner/2, -inner_r, bottom*thread_size], // [0]
|
|
||||||
[x_incr_inner/2, -inner_r, bottom*thread_size + z_incr], // [1]
|
|
||||||
[x_incr_inner/2, -inner_r, top*thread_size + z_incr], // [2]
|
|
||||||
[-x_incr_inner/2, -inner_r, top*thread_size], // [3]
|
|
||||||
|
|
||||||
[-x_incr_outer/2, -outer_r, bottom*thread_size], // [4]
|
|
||||||
[x_incr_outer/2, -outer_r, bottom*thread_size + z_incr], // [5]
|
|
||||||
[x_incr_outer/2, -outer_r, top*thread_size + z_incr], // [6]
|
|
||||||
[-x_incr_outer/2, -outer_r, top*thread_size] // [7]
|
|
||||||
],
|
|
||||||
|
|
||||||
faces = [
|
|
||||||
[0, 3, 7, 4], // This-side trapezoid
|
|
||||||
|
|
||||||
[1, 5, 6, 2], // Back-side trapezoid
|
|
||||||
|
|
||||||
[0, 1, 2, 3], // Inner rectangle
|
|
||||||
|
|
||||||
[4, 7, 6, 5], // Outer rectangle
|
|
||||||
|
|
||||||
// These are not planar, so do with separate triangles.
|
|
||||||
[7, 2, 6], // Upper rectangle, bottom
|
|
||||||
[7, 3, 2], // Upper rectangle, top
|
|
||||||
|
|
||||||
[0, 5, 1], // Lower rectangle, bottom
|
|
||||||
[0, 4, 5] // Lower rectangle, top
|
|
||||||
]
|
|
||||||
);
|
|
||||||
} else {
|
|
||||||
|
|
||||||
// Rule for face ordering: look at polyhedron from outside: points must
|
|
||||||
// be in clockwise order.
|
|
||||||
polyhedron (
|
|
||||||
points = [
|
|
||||||
[-x_incr_inner/2, -inner_r, 0], // [0]
|
|
||||||
[x_incr_inner/2, -inner_r, z_incr], // [1]
|
|
||||||
[x_incr_inner/2, -inner_r, thread_size + z_incr], // [2]
|
|
||||||
[-x_incr_inner/2, -inner_r, thread_size], // [3]
|
|
||||||
|
|
||||||
[-x_incr_outer/2, -outer_r, z0_outer], // [4]
|
|
||||||
[x_incr_outer/2, -outer_r, z0_outer + z_incr], // [5]
|
|
||||||
[x_incr_outer/2, -outer_r, thread_size - z0_outer + z_incr], // [6]
|
|
||||||
[-x_incr_outer/2, -outer_r, thread_size - z0_outer] // [7]
|
|
||||||
],
|
|
||||||
|
|
||||||
faces = [
|
|
||||||
[0, 3, 7, 4], // This-side trapezoid
|
|
||||||
|
|
||||||
[1, 5, 6, 2], // Back-side trapezoid
|
|
||||||
|
|
||||||
[0, 1, 2, 3], // Inner rectangle
|
|
||||||
|
|
||||||
[4, 7, 6, 5], // Outer rectangle
|
|
||||||
|
|
||||||
// These are not planar, so do with separate triangles.
|
|
||||||
[7, 2, 6], // Upper rectangle, bottom
|
|
||||||
[7, 3, 2], // Upper rectangle, top
|
|
||||||
|
|
||||||
[0, 5, 1], // Lower rectangle, bottom
|
|
||||||
[0, 4, 5] // Lower rectangle, top
|
|
||||||
]
|
|
||||||
);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue