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Merge branch 'drag_chain_links' of https://github.com/martinbudden/NopSCADlib into martinbudden-drag_chain_links

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Chris Palmer
2021-12-11 20:51:38 +00:00
parent 05a67d1b2e 9790bdda11
commit 2c197be193
1 changed files with 6 additions and 4 deletions
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10
printed/drag_chain.scad
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@@ -62,6 +62,9 @@ function drag_chain_outer_size(type) = //! Link outer dimensions
let(s = drag_chain_size(type), z = s.z + drag_chain_bwall(type) + drag_chain_twall(type)) let(s = drag_chain_size(type), z = s.z + drag_chain_bwall(type) + drag_chain_twall(type))
[s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * drag_chain_clearance(type), z]; [s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * drag_chain_clearance(type), z];
function drag_chain_links(type) = //! Number of links in chain
ceil(drag_chain_travel(type) / drag_chain_size(type).x) + 4;
function screw_lug_radius(screw) = //! Radius of a screw lug function screw_lug_radius(screw) = //! Radius of a screw lug
corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width; corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width;
@@ -277,16 +280,15 @@ module _drag_chain_assembly(type, pos = 0, render = false) {
s = drag_chain_size(type); s = drag_chain_size(type);
x = (1 + exploded()) * s.x; x = (1 + exploded()) * s.x;
r = drag_chain_radius(type) * x / s.x; r = drag_chain_radius(type) * x / s.x;
travel = drag_chain_travel(type); links = drag_chain_links(type);
links = ceil(travel / s.x); actual_travel = (links - 4) * s.x;
actual_travel = links * s.x;
z = drag_chain_outer_size(type).z; z = drag_chain_outer_size(type).z;
zb = z / 2; // z of bottom track zb = z / 2; // z of bottom track
c = [actual_travel / 2 + pos / 2, 0, r + zb]; // centre of bend c = [actual_travel / 2 + pos / 2, 0, r + zb]; // centre of bend
points = [ // Calculate list of hinge points points = [ // Calculate list of hinge points
for(i = 0, p = [0, 0, z / 2 + 2 * r]; i < links + 5; for(i = 0, p = [0, 0, z / 2 + 2 * r]; i < links + 1;
i = i + 1, i = i + 1,
dx = p.z > c.z ? x : -x, dx = p.z > c.z ? x : -x,
p = max(p.x + dx, p.x) <= c.x ? p + [dx, 0, 0] // Straight sections p = max(p.x + dx, p.x) <= c.x ? p + [dx, 0, 0] // Straight sections