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Added function returning number of links in drag chain.

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This commit is contained in:
Martin Budden
2021-11-16 05:41:16 +00:00
parent 389e2f9c2e
commit 9790bdda11
1 changed files with 6 additions and 4 deletions
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10
printed/drag_chain.scad
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@@ -63,6 +63,9 @@ 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))
[s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * clearance, 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
corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width;
@@ -255,16 +258,15 @@ module _drag_chain_assembly(type, pos = 0, render = false) {
s = drag_chain_size(type);
x = (1 + exploded()) * s.x;
r = drag_chain_radius(type) * x / s.x;
travel = drag_chain_travel(type);
links = ceil(travel / s.x);
actual_travel = links * s.x;
links = drag_chain_links(type);
actual_travel = (links - 4) * s.x;
z = drag_chain_outer_size(type).z;
zb = z / 2; // z of bottom track
c = [actual_travel / 2 + pos / 2, 0, r + zb]; // centre of bend
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,
dx = p.z > c.z ? x : -x,
p = max(p.x + dx, p.x) <= c.x ? p + [dx, 0, 0] // Straight sections