Updated image and readme.

readme.md

@@ -2640,7 +2640,7 @@ SK shaft support brackets
 | Module | Description |
 |:--- |:--- |
 | ```sk_bracket(type)``` | SK shaft support bracket |
-| ```sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw, nut_type = undef)``` | Assembly with fasteners in place |
+| ```sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw, nut_type = undef, max_screw_depth = 6)``` | Assembly with fasteners in place |
 | ```sk_bracket_hole_positions(type)``` | Place children at hole positions |
 
 ![sk_brackets](tests/png/sk_brackets.png)
@@ -2648,17 +2648,21 @@ SK shaft support brackets
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
+|   2 | ```extrusion(E2020, 20)``` |  Extrusion E2020 x 20mm |
+|   2 | ```extrusion(E3030, 20)``` |  Extrusion E3030 x 20mm |
+|   2 | ```sliding_t_nut(M4_hammer_nut)``` |  Nut M4 hammer |
 |   2 | ```sliding_t_nut(M4_sliding_t_nut)``` |  Nut M4 sliding T |
 |   2 | ```sliding_t_nut(M5_sliding_t_nut)``` |  Nut M5 sliding T |
-|   4 | ```nut(M5_nut, nyloc = undef)``` |  Nut M5 x 4mm  |
+|   2 | ```nut(M5_nut, nyloc = undef)``` |  Nut M5 x 4mm  |
 |   1 | ```sk_bracket(SK10)``` |  SK10 shaft support bracket |
 |   1 | ```sk_bracket(SK12)``` |  SK12 shaft support bracket |
 |   1 | ```sk_bracket(SK16)``` |  SK16 shaft support bracket |
 |   1 | ```sk_bracket(SK8)``` |  SK8 shaft support bracket |
 |   2 | ```screw(M4_cap_screw, 12)``` |  Screw M4 cap x 12mm |
-|   6 | ```screw(M5_cap_screw, 16)``` |  Screw M5 cap x 16mm |
-|   2 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
-|  10 | ```washer(M5_washer)``` |  Washer  M5 x 10mm x 1mm |
+|   2 | ```screw(M4_dome_screw, 12)``` |  Screw M4 dome x 12mm |
+|   4 | ```screw(M5_cap_screw, 16)``` |  Screw M5 cap x 16mm |
+|   4 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
+|   6 | ```washer(M5_washer)``` |  Washer  M5 x 10mm x 1mm |
 
 
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tests/sk_brackets.scad

@@ -20,12 +20,19 @@ include <../core.scad>
 use <../utils/layout.scad>
 
 include <../vitamins/sk_brackets.scad>
+include <../vitamins/extrusions.scad>
 
 module sk_brackets() {
-    screws = [M5_cap_screw, M5_cap_screw, M4_cap_screw, M5_cap_screw];
-    nuts = [undef, M5_nut, M4_sliding_t_nut, M5_sliding_t_nut];
-    layout([for(s = sk_brackets) 1.5 * sk_size(s)[1]])
-        sk_bracket_assembly(sk_brackets[$i], screw_type = screws[$i], nut_type = nuts[$i]);
+    screws = [M4_dome_screw, M4_cap_screw, M5_cap_screw, M5_cap_screw];
+    nuts = [M4_hammer_nut, M4_sliding_t_nut, M5_sliding_t_nut, undef];
+    // channel depth = 6 for 2020 extrusion, 9 for 3030 extrusion
+    depths = [6, 6, 9, 0];
+    layout([for(s = sk_brackets) 1.5 * sk_size(s)[1]]) {
+        sk_bracket_assembly(sk_brackets[$i], screw_type = screws[$i], nut_type = nuts[$i], max_screw_depth = depths[$i]);
+        translate([0, -sk_hole_offset(sk_brackets[$i]) - extrusion_width($i < 2 ? E2020 : E3030) / 2, 0])
+            rotate([0, 90, 0])
+                extrusion($i < 2 ? E2020 : E3030, 20);
+    }
 }
 
 if($preview)

vitamins/sk_bracket.scad

@@ -100,7 +100,7 @@ module sk_bracket_hole_positions(type) { //! Place children at hole positions
                 children();
 }
 
-module sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw, nut_type = undef) { //! Assembly with fasteners in place
+module sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw, nut_type = undef, max_screw_depth = 6) { //! Assembly with fasteners in place
     sk_bracket(type);
 
     screw_type = is_undef(screw_type) ? scs_screw(type) : screw_type;
@@ -110,9 +110,8 @@ module sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw,
     nut_washer_thickness = nut_washer_type ? washer_thickness(nut_washer_type) : 0;
 
     nut_offset = sk_base_height(type) + part_thickness;
-    screw_length = nut_washer_type ? screw_longer_than(nut_offset + screw_washer_thickness + nut_washer_thickness + nut_thickness(nut_type))
-                                   : screw_shorter_than(nut_offset + screw_washer_thickness + nut_thickness(nut_type) + 2);
-
+    screw_length = max_screw_depth ? screw_shorter_than(sk_base_height(type) + screw_washer_thickness + max_screw_depth)
+                                   : screw_longer_than(nut_offset + screw_washer_thickness + nut_washer_thickness + nut_thickness(nut_type));
     sk_bracket_hole_positions(type) {
         screw_and_washer(screw_type, screw_length);
         translate_z(-nut_offset)
@@ -123,3 +122,4 @@ module sk_bracket_assembly(type, part_thickness = 2, screw_type = M5_cap_screw,
                     sliding_t_nut(nut_type);
     }
 }
+