add chain module

1 files changed, 19 insertions, 0 deletions

diff --git a/chain.scad b/chain.scad
new file mode 100644
index 0000000..d0d17e9
--- /dev/null
+++ b/chain.scad
@@ -0,0 +1,19 @@
+// a chain around two gears of given radii (r1, r2) and distance;
+// coord origin is at the gear with r1
+module chain(r1, r2, dist, chain_width, chain_height) {
+//    rotate([90, 0, 0])
+    difference() {
+	 chain_template(r1 + chain_height, r2 + chain_height, dist, chain_width);
+	 chain_template(r1, r2, dist, chain_width + 1);
+    }
+}
+
+module chain_template(r1, r2, dist, chain_width)
+    hull () {
+	cylinder(r=r1, h=chain_width, center=true);
+
+	translate([dist, 0, 0])
+	cylinder(r=r2, h=chain_width, center=true);
+    }
+
+chain(20, 30, 100, 10, 5);
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