utility function for rotationally symmetrical copies

used to DRY up adapters/SKRH.scad

adapters/SKRH.scad

@@ -1,54 +1,67 @@
 /*
  * This adapter is for SKRHACE010 and SKRHADE010 (with guide bosses).
  * the A and B variants are slightly smaller (which isn't useful in this case) and much less reliable so I didn't
- * model them, but but it should be easy to adapt this model by changing the switch_* values to match the datasheet
+ * model them, but it should be easy to adapt this model by changing the switch_* values to match the datasheet
  */
 
+
+/* tuned on a Prusa MK3 using .20 mm layer height. supports are helpful but not necessarily required. */
+vertical_slop = 0.1;
+switch_inner_slop = 0.0;
+switch_corner_inner_slop = 0.05;
+boss_inner_slop = 0.05;
+//outer_slop = 0.2;
+
 include <util.scad>;
 include <../settings.scad>;
-
+include <../common/util.scad>
 
 /* my switch measurments are a bit tighter than the spec sheet says, the slop factor will make up the difference,
  * but we want a tight fit to hold the switch in place so this may need to be tuned
  */
-switch_side = 7.4; // 'x' in the dimension table of the data sheet says 7.45 / 7.5
-switch_cropped_corner = 8.5; // 'c' in the table says 8.7
+switch_side = 7.4; // 'x' in the dimension table of the data sheet says 7.45 / 7.5 , I measured 7.4
+switch_cropped_corner = 8.5; // 'c' in the table says 8.7, I measured 8.5
 switch_height = 1.85; // 'h' in the table
-switch_boss_dia = 0.95; // PC Board Mounting diagram suggests a 1.05 mm and a .75 mm hole
+switch_boss_dia = 1.05; // PC Board Mounting diagram suggests a 1.05 mm and a .75 mm hole, I measured 0.95
 switch_boss_height = 0.5; // diagram says 0.5
-
+switch_boss_separation = 3.8;
 
 // good enough if you want to solder the switch with the wires already passed through the adapter
 module basic_SKRH_adapter() {
   difference() {
     // the shape that fits the switch plate hole
     mx_blank();
+    blank_height = 4;
+    blank_lip = 1.2;
+
+    pocket_height = switch_height + vertical_slop + blank_lip;
+    switch_floor = blank_height - pocket_height;
 
     // the basic shape of the switch
-    translate([0,0,3]) intersection() {
-      rotate([0,0,45]) cube([switch_side,switch_side,switch_height+vertical_slop*2], true);
-      cube([switch_cropped_corner,switch_cropped_corner,switch_height+vertical_slop*2],true);
+    translate([0,0,blank_height]) intersection() {
+      rotate([0,0,45]) cube([switch_side+switch_inner_slop,switch_side+switch_inner_slop,2*pocket_height], center=true);
+      cube([switch_cropped_corner+switch_corner_inner_slop,switch_cropped_corner+switch_corner_inner_slop,2*pocket_height],center=true);
     }
 
     /* guide boss holes for the SKRHADE variant
      * NOTE: bosses are actually different sizes (probably so you don't solder the switch backwards),
      * but to me, not being reversable seems like an anti-feature, so we only use the larger size.
      */
-    rotate([0,0,45]) translate([3.8/2,0,4-.5-switch_height-2*vertical_slop]) cylinder($fn=60, h=switch_boss_height+vertical_slop, d=switch_boss_dia+inner_slop);
-    rotate([0,0,180+45]) translate([3.8/2,0,4-.5-switch_height-2*vertical_slop]) cylinder($fn=60, h=switch_boss_height+vertical_slop, d=switch_boss_dia+inner_slop);
+    rotational_clone(2) rotate([0,0,45])  translate([switch_boss_separation/2,0,switch_floor]) cube([switch_boss_dia+boss_inner_slop,switch_boss_dia+boss_inner_slop,2*(switch_boss_height+vertical_slop)], center=true);
 
     // holes to expose contacts and allow wires to pass
-    rotate([0,0,-45]) translate([switch_side/2,0,2])  cube([2,4.7,4+vertical_slop*2], true);
-    rotate([0,0,180-45]) translate([switch_side/2,0,2])  cube([2,4.7,4+vertical_slop*2], true);
+    rotational_clone(2) rotate([0,0,-45])  translate([switch_side/2,0,2])  cube([2,4.7,blank_height+vertical_slop*2], true);
+
+    // scoring to make flexing the holder easier - not needed now that adapter is thinner
+    //translate([0,0,switch_floor]) rotate(45) rotate([90,0,0]) rotate([0,0,45]) cube([.5,.5,6], true);
   }
 }
 
 // an adapter with channels for wires so we can add and remove adapter from an already soldered switch
 module SKRH_adapter() {
   difference() {
     basic_SKRH_adapter();
-    translate([-6,2.16,2]) cube([5,1, 4+vertical_slop*2], true);
-    translate([6,-2.16,2]) cube([5,1, 4+vertical_slop*2], true);
+    rotational_clone(2) translate([-6,2.16,2]) cube([5,2, 4+vertical_slop*2], true);
   }
 }
 

common/util.scad

@@ -0,0 +1,7 @@
+// utility functions
+
+module rotational_clone(clones=2) {
+  for(i=[0:clones-1] ) {
+    rotate([0,0,i * (360/clones)]) children();
+  }
+}