From f73300ff4bf3cb0a46937dd4dacbf350f739fddc Mon Sep 17 00:00:00 2001
From: TQ Hirsch <thequux@upstandinghackers.com>
Date: Fri, 29 Apr 2022 22:32:52 +0200
Subject: [PATCH] Final adjustments to mechanical bits before printing starts

---
 mechanical/parts.scad       | 15 ++++++++-------
 mechanical/stock_parts.scad |  4 ++++
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/mechanical/parts.scad b/mechanical/parts.scad
index 026b833..bdcda53 100644
--- a/mechanical/parts.scad
+++ b/mechanical/parts.scad
@@ -4,6 +4,7 @@ include <stock_parts.scad>
 include <units.inc>
 
 frame_size = 20;
+frame_expansion = 0.2; // expansion on each side
 wall_thickness = 2;
 corner_size = 40; // length of mating surface between corner and frame
 // The length along each edge that the corner bracket takes.  I.e., if
@@ -23,7 +24,7 @@ belt_height2 = belt_height1 + belt_width + 2;
 
 ysled_rail_spacing = (sled_ysize);
 motor_shaft_xoffset = 15;
-motor_mount_length_adjustment = 8;
+motor_mount_length_adjustment = 5;
 motor_mount_length = nema17_face + wall_thickness + motor_mount_length_adjustment;
 
 // distance between centerline of rail and centerline of frame Y tube.
@@ -53,10 +54,10 @@ module corner_base(extension = wall_thickness) {
         polygon(points = cap_points);
 
     // two bars...
-    translate([ -frame_size / 2, actual_corner_offset, -frame_size / 2 ])
-        cube([ frame_size, ldim, frame_size ]);
-    translate([ actual_corner_offset, -frame_size / 2, -frame_size / 2 ])
-        cube([ ldim, frame_size, frame_size ]);
+    translate([ -frame_size / 2 - frame_expansion, actual_corner_offset, -frame_size / 2 - frame_expansion ])
+        cube([ frame_size + frame_expansion*2, ldim, frame_size + frame_expansion*2 ]);
+    translate([ actual_corner_offset, -frame_size / 2 - frame_expansion, -frame_size / 2 - frame_expansion ])
+        cube([ ldim, frame_size + frame_expansion * 2, frame_size + frame_expansion*2 ]);
 
     // Screw holes
     for (pos = [10, 30],
@@ -70,7 +71,7 @@ module corner_base(extension = wall_thickness) {
     }
 
     // Adjustable feet
-    cylinder(d=8, h=odim * 2 + 1, center=true, $fn = screw_num_sides);
+    cylinder(d=m6_insert_d, h=odim * 2 + 1, center=true);
   }
 }
 
@@ -177,7 +178,7 @@ module nema17_housing() {
   translate([ 0, -nema17_face / 2 - frame_size / 2 - wall_thickness, 0 ]) {
     slotify(slot_vector) {
       translate([ 0, 0, -belt_height2/2 - wall_thickness ])
-        cube([ nema17_face + 1, nema17_face + 1, hdepth + belt_height2 ], center = true);
+        cube([ nema17_face + 2, nema17_face + 2, hdepth + belt_height2 ], center = true);
       cylinder(d = 23, frame_size);
     }
     for (x = [-1, 1], y = [-1,1]) {
diff --git a/mechanical/stock_parts.scad b/mechanical/stock_parts.scad
index 96cc01e..4011678 100644
--- a/mechanical/stock_parts.scad
+++ b/mechanical/stock_parts.scad
@@ -8,6 +8,10 @@ bushing_len = 24;
 
 nema17_face = 42.3;
 
+m3_insert_d = 4.2;
+m5_insert_d = 7.5;
+m6_insert_d = 8.2;
+
 module colorize(colorname) {
   if (use_colors) {
     color(colorname) union() { children(); }