add cleaned up dobervich's mounting bracket drill jig

diff --git a/mounting-bracket-drill-jig.scad b/mounting-bracket-drill-jig.scad
new file mode 100644 (file)
index 0000000..8cd49bc
--- /dev/null
+++ b/mounting-bracket-drill-jig.scad
@@ -0,0 +1,98 @@
+mm_per_inch = 25.4;
+
+material_width = (1/8) * mm_per_inch;
+
+board_length = 1.75 * mm_per_inch;
+board_width = 1.5 * mm_per_inch;
+board_depth = (3/16) * mm_per_inch;
+tab_length = 3 * mm_per_inch;
+tab_width = (1/4) * mm_per_inch;
+
+union(){
+  rotate(a = 90, v = [1, 0, 0]) {
+    cube([board_length + material_width,
+          1.75 * mm_per_inch + material_width,
+          material_width ]);}
+
+  translate(v = [0, -material_width, 0]){
+    rotate(a = -90, v = [0, 1, 0]) {
+      cube( [1.75 * mm_per_inch + material_width,
+             1.5 * mm_per_inch + 2 * material_width,
+             material_width ]);}}
+
+  translate(v = [(1.75*mm_per_inch + material_width)/2 + tab_width,
+                 -tab_length, 0]){
+    rotate(a = 90, v = [0 ,0 ,1 ]){
+      cube([3*mm_per_inch, 0.5*mm_per_inch , material_width]);}}
+
+  translate(v = [-tab_length,
+                 (1.5*mm_per_inch + material_width)/2 - tab_width,
+                 0]){
+    cube([3*mm_per_inch, 0.5*mm_per_inch , material_width]);}
+
+  translate(v = [(1.75*mm_per_inch + material_width)/2 + tab_width,
+                 (1.5*mm_per_inch),
+                 0]){
+    rotate(a = 90, v = [0, 0, 1]){
+      cube([3*mm_per_inch, 0.5*mm_per_inch , material_width]);}}
+
+  translate(v = [(1.75*mm_per_inch),
+                 (1.5*mm_per_inch+material_width)/2 - tab_width,
+                 0]){
+    cube([3*mm_per_inch, 0.5*mm_per_inch , material_width]);}}
+
+_4_40 = 0.1285*mm_per_inch/2; // size of hole for 4x40
+_6_32 = 0.1495*mm_per_inch/2; // size of hole for 6x32
+
+module collar_hole(){
+  cylinder(h = board_depth, r = 2*_6_32, $fn=20);}
+
+module nubbin_hole(){
+  cylinder(h = board_depth, r = _6_32, $fn=20);}
+
+module mounting_screw_hole(){
+  cylinder(h = board_depth, r = _6_32, $fn=20);}
+
+module bracket_screw_hole(){
+  cylinder(h = board_depth, r = _6_32, $fn=20);}
+
+module wheel_motor_holes(scale){
+  translate([ 51-26.78,38-10.8, 0] * scale) {
+    collar_hole();}
+  translate([ 51-26.78,38-22.23, 0] * scale){
+    nubbin_hole();}
+  translate([51-18.05-17.45,38-30.81,  0] * scale){
+    mounting_screw_hole();}
+  translate([51-18.05,38-30.81, 0] * scale){
+    mounting_screw_hole();}
+  translate([7.5,8.5, 0] * scale){
+    bracket_screw_hole();}
+  translate([7.5,21+8.5,   0] * scale){
+    bracket_screw_hole();}}
+
+module wheel_mount(scale){
+  difference(){
+    cube(scale * [board_length + material_width,
+                  board_width + material_width,
+                  material_width]);
+    wheel_motor_holes(scale);}}
+
+wheel_mount(1);
+
+translate(v = [0, 0, board_length]) jig_lid();
+
+module jig_lid() {
+  union() {
+    wheel_mount(1);
+    translate(v = [0, -2.1 * material_width, material_width]){
+      cube([board_length + material_width,
+            3.1 * material_width,
+            material_width]);}
+    translate(v = [0, -2.1 * material_width, 0]){
+      cube([board_length + material_width, material_width, material_width]);}
+    translate(v = [-2.1 * material_width, 0, material_width]){
+      cube([3.1 * material_width,
+            board_width + material_width,
+            material_width]);}
+    translate(v = [-2.1 * material_width, 0, 0]){
+      cube([material_width, board_width+material_width, material_width]);}}}