add pin end variants, fix configurations, add finished damper parts

ball-amort/ball_amort.scad

@@ -1,27 +1,47 @@
+// Configurable LEGO shock absorber
+// (c) Vitaliy Filippov 2015
+// License: GNU GPL 3.0+
+
+// -- CONFIGURATION -- //
+
 $fn = 50;
 tube_length = 4; // tube length in studs
 piston_length = 3; // piston length in studs
 travel_length = piston_length-2; // piston travel in studs
-top_type = "axle"; // top mounting type: 'pin' = pin hole, 'ball' = ball end hole, 'axle' = axle hole, "axle_rod" = axle, "ball_end" = ball
-bottom_type = "ball"; // bottom mounting type
+top_type = "ball"; // top mounting type: "pin_hole" = pin hole, "ball_hole" = ball end hole, "axle_hole" = axle hole, "axle" = axle, "ball" = ball, "pin" = pin without friction, "pin_friction" = pin with friction
+bottom_type = "pin"; // bottom mounting type
+cross_section = false; // show cross-section of the assembly
+
+// -- MAIN -- //
 
 travel = min(travel_length, piston_length-2, tube_length-2);
 
-//difference() { union() {
+difference() { union() {
 
-difference() {
-  tube_offset = (bottom_type == "axle" || bottom_type == "axle_rod" ? 1 : (bottom_type == "ball_end" ? 0.4 : 0));
-  union() {
-    translate([0, 0, 8]) cylinder(r=4, h=tube_length*8-8);
-    mount_base(type=bottom_type, r=4);
+tube();
+
+color([1, 0.5, 0.5]) translate([0, 0, (tube_length+piston_length-1)*8]) rotate([180, 0, 0]) piston();
+
+color([0.5, 0.5, 1]) translate([0, 0, tube_length*8-6]) fixer();
+
+} if (cross_section) { translate([0, -50, -1]) cube(size=[10, 500, (tube_length+piston_length+1)*8]); } }
+
+// -- MODULES -- //
+
+module tube() {
+  difference() {
+    tube_offset = (bottom_type == "axle_hole" || bottom_type == "axle" || bottom_type == "pin" || bottom_type == "pin_friction" ? 1 : (bottom_type == "ball" ? 0.4 : 0));
+    union() {
+      translate([0, 0, 8]) cylinder(r=4, h=tube_length*8-8);
+      mount_base(type=bottom_type, r=4);
+    }
+    mount_hole(bottom_type);
+    translate([0, 0, 8+tube_offset]) cylinder(r=3.2, h=tube_length*8-tube_offset);
+    translate([-5, -0.5, tube_length*8-6]) cube(size=[10, 1, 3], center=false);
   }
-  mount_hole(bottom_type);
-  translate([0, 0, 8+tube_offset]) cylinder(r=3.2, h=tube_length*8-tube_offset);
-  translate([-5, -0.5, tube_length*8-6]) cube(size=[10, 1, 3], center=false);
 }
 
-color([1, 0.5, 0.5]) translate([0, 0, (tube_length+piston_length-1)*8]) rotate([180, 0, 0])
-{
+module piston() {
   difference() {
     union() {
       //translate([0, 0, 4]) cylinder(r=3, h=piston_length*8-4);
@@ -34,41 +54,53 @@ color([1, 0.5, 0.5]) translate([0, 0, (tube_length+piston_length-1)*8]) rotate([
   }
 }
 
-//rotate([90, 0, 0])
-color([0.5, 0.5, 1]) translate([-4, -0.5, tube_length*8-6])
-cube(size=[8, 1, 3], center=false);
-
-//} translate([0, -50, -1]) cube(size=[10, 500, 500]); }
-
-//rotate([10, 0, 0]) axleround(h=8);
+module fixer() {
+  translate([-4, -0.5, 0])
+    cube(size=[8, 1, 3], center=false);
+}
 
 module mount_base(type, r = 3) {
-  if (type == "pin" || type == "ball" || type == "axle") {
+  if (type == "ball_hole" || type == "axle_hole") {
     cylinder(r=4, h=8+0.1);
   }
-  else if (type == "axle_rod") {
+  else if (type == "pin_hole") {
+    hull() {
+      translate([0, 0, 4]) cylinder(r=r, h=4);
+      difference() {
+        rotate([90, 0, 0]) translate([0, 4, -3.2]) cylinder(r=4, h=6.4);
+        translate([-5, -5, 7.2]) cube(size=[10, 10, 0.8]);
+      }
+    }
+  }
+  else if (type == "axle") {
     axleround(h=8+0.1);
   }
-  else if (type == "ball_end") {
+  else if (type == "ball") {
     translate([0, 0, 4]) sphere(r=3);
     translate([0, 0, 6]) linear_extrude(scale=r, height=2) circle(r=1);
   }
+  else if (type == "pin") {
+    half_pin(false);
+  }
+  else if (type == "pin_friction") {
+    half_pin(true);
+  }
 }
 
 module mount_hole(type) {
-  if (type == "pin") {
+  if (type == "pin_hole") {
     rotate([90, 0, 0]) translate([0, 4, -4]) pin_hole();
   }
-  else if (type == "ball") {
+  else if (type == "ball_hole") {
     ball_end_n();
   }
-  else if (type == "axle") {
+  else if (type == "axle_hole") {
     translate([0, 0, -0.1]) axleround(h=8+0.1, axleradius=2.4, axlemesh=1.85);
     translate([0, 0, -0.1]) cylinder($fs=0.5, h=0.8+0.1, r=5);
   }
 }
 
-// cut for ball end
+// ball end cut
 module ball_end_n() {
   translate([0, 0, 4]) sphere(r=3.05);
   translate([0, 0, 2.3-0.1]) cylinder(r=2.9, h=2);
@@ -86,9 +118,34 @@ module axleround(h = 24, axleradius = 2.3, axlemesh = 1.7) {
 }
 
 module pin_hole(height=8) {
-  union() {
-    translate([0, 0, -0.1]) cylinder($fs=0.5, h=height+0.2, r=2.5);
-    translate([0, 0, -0.1]) cylinder($fs=0.5, h=0.8+0.1, r=3);
-    translate([0, 0, height-0.8]) cylinder($fs=0.5, h=0.8+0.1, r=3);
-  }
+  translate([0, 0, -0.1]) cylinder($fs=0.5, h=height+0.2, r=2.5);
+  translate([0, 0, -0.1]) cylinder($fs=0.5, h=0.8+0.1, r=3);
+  translate([0, 0, height-0.8]) cylinder($fs=0.5, h=0.8+0.1, r=3);
 }
+
+module half_pin(friction = false) {
+  difference() {
+    union() {
+      cylinder($fs=0.5, h=8, r=2.4);
+      if (friction) {
+        intersection() {
+          cylinder($fs=0.5, h=8, r=2.5);
+          union() {
+            rotate([0, 0, 45]) translate([-0.4, -2.5, 8-0.8-1.6]) cube(size=[0.6, 5, 1.6]);
+            rotate([0, 0, 45]) translate([-0.4, -2.5, 0.6]) cube(size=[0.6, 5, 1.6]);
+            rotate([0, 0, 135]) translate([-0.4, -2.5, 8-0.8-1.6]) cube(size=[0.6, 5, 1.6]);
+            rotate([0, 0, 135]) translate([-0.4, -2.5, 0.6]) cube(size=[0.6, 5, 1.6]);
+          }
+        }
+      }
+      //cylinder($fs=0.5, h=0.6, r=2.6);
+      translate([0, 0, 0.2]) minkowski() {
+        cylinder($fs=0.5, h=0.2, r=2.4);
+        sphere($fn=6, r=0.2);
+      }
+      translate([0, 0, 8-0.8]) cylinder($fs=0.5, h=0.8, r=2.9);
+    }
+    translate([0, 0, -0.2]) cylinder($fs=0.5, h=8+0.2, r=2.4-0.8);
+    translate([-0.5, -5, -0.1]) cube(size=[1, 10, 4]);
+  }
+}