Working itty bitty dual extruder to Wilson mount

Hole spacing tweaked to finally be dead on

Holes still need some adjustement (a hair too snug), and square hole
placement is just mathemagically broken (should be centered on origin to
make it better). There are a couple of minor cosmetic issues as
well (not quite perfectly lined up with the outside of the Wilson
x-carriage) but they do not affect functionality.

diff --git a/carriage adapter/itty-wilson.scad b/carriage adapter/itty-wilson.scad
index 980eab4..f91b69e 100644 (file)
--- a/carriage adapter/itty-wilson.scad
+++ b/carriage adapter/itty-wilson.scad
@@ -28,12 +28,18 @@ Intended for use with the itty bitty dual extruder series.
 Source needs a good cleanup. Evil loops that don't take advantage of
 the geometry of the object abound.
 
+major todo:
+
+ - square hole placement is a total mess
+
 */
 
 use <MCAD/nuts_and_bolts.scad>
 
-carriage_height = 65;
-carriage_width = 50;
+$fn = 64;
+
+carriage_height = 64;
+carriage_width = 52;
 
 plate_width = 75; // wilson carriage is only 50mm wide!
 plate_depth = 6; // wilson default depth = 8, makerfarm = 6
@@ -48,7 +54,7 @@ plate_cut_y_offset = 27;
 plate_cut_bolt = 3 + hole_tolerance;
 plate_cut_x_bolt_offset = 10.5 + plate_cut_bolt / 2;
 
-plate_extra_height = 3; // make plate a bit taller so it is structurally sound
+plate_extra_height = 4; // make plate a bit taller so it is structurally sound
 
 plate_height = plate_cut_height + plate_cut_y_offset + plate_extra_height; 
 
@@ -57,7 +63,7 @@ lower_bolt_x_offset = 1.5 + plate_cut_bolt / 2;
 lower_bolt_y_offset = 3.275 + plate_cut_bolt / 2;
 
 carriage_bolt = 4 + hole_tolerance;
-carriage_hole_spacing = 24;
+carriage_hole_spacing = 23;
 carriage_clearance = 20; // holes are 20mm from bottom of plate
 carriage_y_offset =  plate_cut_y_offset + plate_cut_height + carriage_clearance;
 carriage_nut_depth = 3.2 + 3.2/2 + 0.1; // m4 nut depth + half of an m4 nut + tolerance
@@ -65,7 +71,7 @@ carriage_nut_depth = 3.2 + 3.2/2 + 0.1; // m4 nut depth + half of an m4 nut + to
 corner_radius = 3; // round off the corners to make it look nicer
 
 shelf_mount ();
-translate ([(plate_width - carriage_width) / 2, plate_height - plate_extra_height, 0]) carriage_mount ();
+translate ([(plate_width - carriage_width) / 2, plate_height - plate_extra_height/2, 0]) carriage_mount ();
 
 // mount to wilson x-carriage
 module carriage_mount () {
@@ -82,7 +88,7 @@ module carriage_mount () {
 
                    #translate ([(carriage_width - carriage_hole_spacing) / 2, (carriage_height - carriage_hole_spacing) /2, 0])
                    for (x = [0, carriage_hole_spacing], y = [0, carriage_hole_spacing]) {
-                        translate ([x, y, 0]) circle (d = carriage_bolt, $fn = 16);
+                        translate ([x, y, 0]) circle (d = carriage_bolt);
                    }
               }
          }
@@ -109,22 +115,22 @@ module shelf_mount () {
               // upper shelf mount
               translate ([0, plate_cut_y_offset, 0]) {
                    for (x = [-0.01, plate_cut_width + plate_cut_distance, plate_cut_width*2 + plate_cut_distance + plate_cut_center, plate_cut_width*3 + plate_cut_distance*2 + plate_cut_center + 0.01])
-                        translate ([x, 0, 0]) square ([plate_cut_width, plate_cut_height]);
+                        #translate ([x - hole_tolerance/2, 0, 0]) square ([plate_cut_width + hole_tolerance, plate_cut_height]);
 
                    // looks like the bolt is at the midpoint between the cut outs
                    for (x = [plate_cut_x_bolt_offset, plate_width - plate_cut_x_bolt_offset])
-                        translate ([x, plate_cut_height / 2, 0]) circle (d = plate_cut_bolt + hole_tolerance, $fn = 16);
+                        translate ([x, plate_cut_height / 2, 0]) circle (d = plate_cut_bolt + hole_tolerance);
               }
 
               // lower shelf mount
               translate ([0, lower_cut_y_offset, 0]) {
-                   for (x = [-0.01, plate_width - plate_cut_width + 0.01]) {
+                   for (x = [plate_cut_width/2 - 0.01, plate_width - plate_cut_width/2 + 0.01]) {
                         // lower cut out is closer to 6mm than 6.5mm in cad drawings
-                        translate ([x, -0.01, 0]) square ([plate_cut_width, plate_cut_height - 0.5]);
+                        translate ([x, plate_cut_height/2, 0]) square ([plate_cut_width, plate_cut_height - 0.5], center=true);
                    }
                    // I think the intention is for the screw holes to be centered over the cut out
                    for (x = [lower_bolt_x_offset, plate_width - lower_bolt_x_offset])
-                        translate ([x, plate_cut_height + lower_bolt_y_offset, 0]) circle (d = plate_cut_bolt + hole_tolerance, $fn = 16);
+                        translate ([x, plate_cut_height + lower_bolt_y_offset, 0]) circle (d = plate_cut_bolt + hole_tolerance);
               }
          }
      }