2015/03/13 13:37

module screw(type = 2, r1 = 15, r2 = 20, n = 7, h = 100, t = 8)
{
linear_extrude(height = h, twist = 360*t/n, convexity = t)
difference() {
circle(r2);
for (i = [0:n-1]) {
if (type == 1) rotate(i*360/n) polygon([
[ 2*r2, 0 ],
[ r2, 0 ],
[ r1*cos(180/n), r1*sin(180/n) ],
[ r2*cos(360/n), r2*sin(360/n) ],
[ 2*r2*cos(360/n), 2*r2*sin(360/n) ],
]);
if (type == 2) rotate(i*360/n) polygon([
[ 2*r2, 0 ],
[ r2, 0 ],
[ r1*cos(90/n), r1*sin(90/n) ],
[ r1*cos(180/n), r1*sin(180/n) ],
[ r2*cos(270/n), r2*sin(270/n) ],
[ 2*r2*cos(270/n), 2*r2*sin(270/n) ],
]);
}
}
}

module nut(type = 2, r1 = 16, r2 = 21, r3 = 30, s = 6, n = 7, h = 100/5, t = 8/5)
{
difference() {
cylinder($fn = s, r = r3, h = h); translate([ 0, 0, -h/2 ]) screw(type, r1, r2, n, h*2, t*2); } } module spring(r1 = 100, r2 = 10, h = 100, hr = 12) { stepsize = 1/16; module segment(i1, i2) { alpha1 = i1 * 360*r2/hr; alpha2 = i2 * 360*r2/hr; len1 = sin(acos(i1*2-1))*r2; len2 = sin(acos(i2*2-1))*r2; if (len1 < 0.01) polygon([ [ cos(alpha1)*r1, sin(alpha1)*r1 ], [ cos(alpha2)*(r1-len2), sin(alpha2)*(r1-len2) ], [ cos(alpha2)*(r1+len2), sin(alpha2)*(r1+len2) ] ]); if (len2 < 0.01) polygon([ [ cos(alpha1)*(r1+len1), sin(alpha1)*(r1+len1) ], [ cos(alpha1)*(r1-len1), sin(alpha1)*(r1-len1) ], [ cos(alpha2)*r1, sin(alpha2)*r1 ], ]); if (len1 >= 0.01 && len2 >= 0.01) polygon([ [ cos(alpha1)*(r1+len1), sin(alpha1)*(r1+len1) ], [ cos(alpha1)*(r1-len1), sin(alpha1)*(r1-len1) ], [ cos(alpha2)*(r1-len2), sin(alpha2)*(r1-len2) ], [ cos(alpha2)*(r1+len2), sin(alpha2)*(r1+len2) ] ]); } linear_extrude(height = 100, twist = 180*h/hr,$fn = (hr/r2)/stepsize, convexity = 5) {
for (i = [ stepsize : stepsize : 1+stepsize/2 ])
segment(i-stepsize, min(i, 1));
}
}

translate([ -30, 0, 0 ])
screw();

translate([ 30, 0, 0 ])
nut();

spring();

0 评论
0 收藏
0