reorganize old files, and update readme with banner image

rack/open-frame.scad

@@ -0,0 +1,85 @@
+$fn=64;
+include <./math.scad>
+
+eps=0.1;
+
+module leg() {
+    mainLength = 80;
+    upperDim = 20;
+    innerDim = 10;
+    
+    translate(v=[0,0,mainLength/2]) {
+      cube(size=[upperDim, upperDim, mainLength], center=true);
+    
+      translate(v=[0,0,mainLength/2 + innerDim/8-0.3])
+        cube(size=[innerDim, innerDim, innerDim/4-0.5], center=true);
+
+    }
+}
+
+
+module base() {
+
+  difference() {
+    union() {
+      cube(size=[200,200,4], center=true);
+
+      // legs
+      for (i=mirror4XY(midpoint=[0,0,-2], offsetX=90, offsetY=90)) {
+        translate(v=i)
+          leg();
+      }
+
+      // base support
+      translate(v=[0,0,4.5])
+        cube(size=[200,5,5], center=true);
+
+      rotate(a=[0,0,90])
+        translate(v=[0,0,4.5])
+        cube(size=[200,5,5], center=true);
+
+      translate(v=[0,-98,4.5])
+        cube(size=[200,4,5], center=true);
+
+      rotate(a=[0,0,90])
+        translate(v=[0,-98,4.5])
+        cube(size=[200,4,5], center=true);
+
+      rotate(a=[0,0,180])
+        translate(v=[0,-98,4.5])
+        cube(size=[200,4,5], center=true);
+
+      rotate(a=[0,0,270])
+        translate(v=[0,-98,4.5])
+        cube(size=[200,4,5], center=true);
+
+    }
+        
+    union() {
+
+      
+      // lug holes
+      for (i=mirror4XY(midpoint=[0,0,0], offsetX=50, offsetY=50)) {
+        for (j=mirror4XY(midpoint=i, offsetX=40, offsetY=40)) {
+          translate(v=j)
+            cube(size=[10+0.3,10+0.3,140], center=true);
+        }
+      }
+      
+      // decorative perforations
+      for (i=mirror4XY(midpoint=[0,0,0], offsetX=50, offsetY=50)) {
+        translate(v=i)
+          minkowski() {
+          cube(size=[30,30,50], center=true);
+          cylinder(r=20, h=10);
+        }
+      }
+          
+    }
+  }
+}
+
+
+base();
+
+