Merge pull request #1530 from xloem/gears

spur_gear: fix negative helix angles
BelfrySCAD · Dec 19, 2024 · a95916b · a95916b
2 parents 0f09d1f + db8236d
commit a95916b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/gears.scad b/gears.scad
@@ -1013,7 +1013,7 @@ module spur_gear(
                : assert(false,"atype must be one of \"root\", \"tip\" or \"pitch\"");
     circum = 2 * PI * pr;
     twist = 360*thickness*tan(helical)/circum;
-    slices = default(slices, ceil(twist/360*segs(pr)+1));
+    slices = default(slices, ceil(abs(twist)/360*segs(pr)+1));
     default_tag("remove", internal) {
         attachable(anchor,spin,orient, r=anchor_rad, l=thickness) {
             zrot(gear_spin)