Added 2screw_blocks, a two screw version of corner blocks.

2025-01-16 13:08:15 +01:00 · 2022-01-29 11:15:51 +00:00 · 2022-01-29 11:15:51 +00:00 · c4ccc30b35
commit c4ccc30b35
parent 20db11f81e
6 changed files with 176 additions and 20 deletions
--- a/libtest.png
+++ b/libtest.png
--- a/libtest.scad
+++ b/libtest.scad
@ -160,10 +160,10 @@ translate([x5, cable_grommets_y + 60])
 translate([x5, cable_grommets_y + 90])
    corner_blocks();

-translate([x5, cable_grommets_y + 150])
+translate([x5, cable_grommets_y + 160])
    feet();

-translate([x5 + 70, cable_grommets_y + 150])
+translate([x5 + 70, cable_grommets_y + 160])
    screw_knobs();

 translate([x5, cable_grommets_y + 470]) {
--- a/printed/corner_block.scad
+++ b/printed/corner_block.scad
@ -29,6 +29,9 @@
 //! This allows the block and one set of fasteners to be on one assembly and the other fasteners on the mating assemblies.
 //!
 //! Star washers can be omitted by setting `star_washers` to false.
+//!
+//! A 2screw_block is a thinner version with two screws and two mating surfaces. It can be used as an alternative to fixing blocks when
+//! high lateral rigity is not required.
 //
 include <../core.scad>
 use <../vitamins/insert.scad>
@ -45,6 +48,7 @@ function corner_block_hole_offset(screw = def_screw) = //! Hole offset from the
    let(insert = screw_insert(screw))
        insert_length(insert) + max(overshoot + screw_clearance_radius(screw), insert_hole_radius(insert)) + 1;

+
 function corner_block_width(screw = def_screw) = //! Block width, depth and height
    corner_block_hole_offset(screw) + insert_outer_d(screw_insert(screw)) / 2 + wall;

@ -192,3 +196,127 @@ module corner_block_M30_assembly() corner_block_assembly(M3_cap_screw);
 //! 1. Lay the blocks on each of their other two flat sides and repeat.
 //
 module corner_block_M40_assembly() corner_block_assembly(M4_cap_screw);
+
+function 2screw_block_width(screw = def_screw) = //! 2 screw block width is narrower, height and depth are as corner_block
+    insert_outer_d(screw_insert(screw)) + 2 * wall;
+
+function 2screw_block_v_hole(screw = def_screw) = translate([0, corner_block_hole_offset(screw)]) * rotate([180, 0, 0]); //! Transform to bottom hole
+function 2screw_block_h_hole(screw = def_screw) = translate([0, 0, corner_block_hole_offset(screw)]) * rotate([90, 0, 0]); //! Transform to front hole
+function 2screw_block_holes(screw) = concat([2screw_block_v_hole(screw)], [2screw_block_h_hole(screw)]); //! List of transforms to both holes
+
+module 2screw_block_v_hole(screw = def_screw) //! Place children at the bottom screw hole
+    multmatrix(2screw_block_v_hole(screw))
+        children();
+
+module 2screw_block_h_hole(screw = def_screw) //! Place children at the front screw hole
+    multmatrix(2screw_block_h_hole(screw))
+        children();
+
+module 2screw_block_holes(screw = def_screw) //! Place children at both screw holes
+    for(p = 2screw_block_holes(screw))
+        multmatrix(p)
+            children();
+
+module 2screw_block(screw = def_screw, name = false) { //! Generate the STL for a printed 2screw block
+    r = 1;
+    cb_width = 2screw_block_width(screw);
+    cb_height = corner_block_width(screw);
+    cb_depth = cb_height;
+    insert = screw_insert(screw);
+    corner_rad = insert_outer_d(insert) / 2 + wall;
+    offset = corner_block_hole_offset(screw);
+
+    stl(name ? name : str("2screw_block", "_M", screw_radius(screw) * 20))
+        difference() {
+            hull()  {
+                translate([-cb_width / 2 + r, r])
+                    cylinder(r = r, h = 1);
+
+                translate([cb_width / 2 - r, r])
+                    cylinder(r = r, h = 1);
+
+                translate([0, offset, offset])
+                    sphere(corner_rad);
+
+                translate([0, offset])
+                    cylinder(r = corner_rad, h = 1);
+
+                translate([0, r, offset])
+                    rotate([-90, 0, 180])
+                        rounded_cylinder(r = corner_rad, h = r, r2 = r);
+            }
+            2screw_block_v_hole(screw)
+                insert_hole(insert, overshoot);
+
+            2screw_block_h_hole(screw)
+                insert_hole(insert, overshoot, true);
+
+            children();
+        }
+}
+
+module 2screw_block_assembly(screw = def_screw, name = false) //! The printed block with inserts
+assembly(str("2screw_block_M", 20 * screw_radius(screw)), ngb = true) {
+    insert = screw_insert(screw);
+
+    stl_colour(name ? pp2_colour : pp1_colour)
+        render() 2screw_block(screw, name) children();
+
+    2screw_block_holes(screw)
+        insert(insert);
+}
+
+module fastened_2screw_block_assembly(thickness, screw = def_screw, thickness_below = undef, name = false, show_block = true, star_washers = true) { //! Printed block with fasteners
+    thickness2 = !is_undef(thickness_below) ? thickness_below : thickness;
+    function screw_len(t) = screw_length(screw, t + overshoot, star_washers ? 2 : 1, true);
+    screw_length = screw_len(thickness);
+    screw_length2 = screw_len(thickness2);
+
+    if(show_block)
+        2screw_block_assembly(screw, name) children();
+
+    if(thickness)
+        2screw_block_h_hole(screw)
+            translate_z(thickness)
+                screw_and_washer(screw, screw_length, star_washers);
+
+    if(thickness2)
+        2screw_block_v_hole(screw)
+            translate_z(thickness2)
+                screw_and_washer(screw, screw_length2, star_washers);
+}
+module 2screw_block_M20_stl() 2screw_block(M2_cap_screw);
+module 2screw_block_M25_stl() 2screw_block(M2p5_cap_screw);
+module 2screw_block_M30_stl() 2screw_block(M3_cap_screw);
+module 2screw_block_M40_stl() 2screw_block(M4_cap_screw);
+//
+//! 1. Lay the blocks out and place an M2 insert in the forward facing hole.
+//! 1. Push them home with a soldering iron with a conical bit heated to 200&deg;C.
+//! When removing the iron it helps to twist it a little anti-clockwise to release it from the thread.
+//! 1. Lay the blocks on each of their other flat side and repeat.
+//
+module 2screw_block_M20_assembly() 2screw_block_assembly(M2_cap_screw);
+
+//
+//! 1. Lay the blocks out and place an M2.5 insert in the forward facing hole.
+//! 1. Push them home with a soldering iron with a conical bit heated to 200&deg;C.
+//! When removing the iron it helps to twist it a little anti-clockwise to release it from the thread.
+//! 1. Lay the blocks on each of their other flat side and repeat.
+//
+module 2screw_block_M25_assembly() 2screw_block_assembly(M2p5_cap_screw);
+
+//
+//! 1. Lay the blocks out and place an M3 insert in the forward facing hole.
+//! 1. Push them home with a soldering iron with a conical bit heated to 200&deg;C.
+//! When removing the iron it helps to twist it a little anti-clockwise to release it from the thread.
+//! 1. Lay the blocks on each of their other flat side and repeat.
+//
+module 2screw_block_M30_assembly() 2screw_block_assembly(M3_cap_screw);
+
+//
+//! 1. Lay the blocks out and place an M4 insert in the forward facing hole.
+//! 1. Push them home with a soldering iron with a conical bit heated to 200&deg;C.
+//! When removing the iron it helps to twist it a little anti-clockwise to release it from the thread.
+//! 1. Lay the blocks on each of their other flat side and repeat.
+//
+module 2screw_block_M40_assembly() 2screw_block_assembly(M4_cap_screw);
--- a/readme.md
+++ b/readme.md
@ -4810,6 +4810,9 @@ This allows the block and one set of fasteners to be on one assembly and the oth

 Star washers can be omitted by setting `star_washers` to false.

+A 2screw_block is a thinner version with two screws and two mating surfaces. It can be used as an alternative to fixing blocks when
+high lateral rigity is not required.
+
 [printed/corner_block.scad](printed/corner_block.scad) Implementation.

 [tests/corner_block.scad](tests/corner_block.scad) Code for this example.
@ -4817,6 +4820,10 @@ Star washers can be omitted by setting `star_washers` to false.
 ### Functions
 | Function | Description |
 |:--- |:--- |
+| `2screw_block_h_hole(screw = def_screw)` | Transform to front hole |
+| `2screw_block_holes(screw)` | List of transforms to both holes |
+| `2screw_block_v_hole(screw = def_screw)` | Transform to bottom hole |
+| `2screw_block_width(screw = def_screw)` | 2 screw block width is narrower, height and depth are as corner_block |
 | `corner_block_h_holes(screw = def_screw)` | List of transforms to side holes |
 | `corner_block_hole_offset(screw = def_screw)` | Hole offset from the edge |
 | `corner_block_holes(screw)` | List of transforms to all holes |
@ -4827,11 +4834,17 @@ Star washers can be omitted by setting `star_washers` to false.
 ### Modules
 | Module | Description |
 |:--- |:--- |
+| `2screw_block(screw = def_screw, name = false)` | Generate the STL for a printed 2screw block |
+| `2screw_block_assembly(screw = def_screw, name = false)` | The printed block with inserts |
+| `2screw_block_h_hole(screw = def_screw)` | Place children at the front screw hole |
+| `2screw_block_holes(screw = def_screw)` | Place children at both screw holes |
+| `2screw_block_v_hole(screw = def_screw)` | Place children at the bottom screw hole |
 | `corner_block(screw = def_screw, name = false)` | Generate the STL for a printed corner block |
 | `corner_block_assembly(screw = def_screw, name = false)` | The printed block with inserts |
 | `corner_block_h_holes(screw = def_screw, index = undef)` | Place children at the side screw holes |
 | `corner_block_holes(screw = def_screw)` | Place children at all the holes |
 | `corner_block_v_hole(screw = def_screw)` | Place children at the bottom screw hole |
+| `fastened_2screw_block_assembly(thickness, screw = def_screw, thickness_below = undef, name = false, show_block = true, star_washers = true)` | Printed block with fasteners |
 | `fastened_corner_block_assembly(thickness, screw = def_screw, thickness_below = undef, thickness_side2 = undef, name = false, show_block = true, star_washers = true)` | Printed block with all fasteners |

 ![corner_block](tests/png/corner_block.png)
@ -4839,26 +4852,30 @@ Star washers can be omitted by setting `star_washers` to false.
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   3 | `insert(F1BM2)` |  Heatfit insert M2 |
-|   3 | `insert(F1BM2p5)` |  Heatfit insert M2.5 |
-|   3 | `insert(F1BM3)` |  Heatfit insert M3 |
-|   3 | `insert(F1BM4)` |  Heatfit insert M4 |
-|   3 | `screw(M2_cap_screw, 8)` |  Screw M2 cap x  8mm |
-|   3 | `screw(M2p5_pan_screw, 10)` |  Screw M2.5 pan x 10mm |
-|   3 | `screw(M3_dome_screw, 10)` |  Screw M3 dome x 10mm |
-|   3 | `screw(M4_dome_screw, 12)` |  Screw M4 dome x 12mm |
-|   3 | `washer(M2_washer)` |  Washer  M2 x 5mm x 0.3mm |
-|   3 | `washer(M2p5_washer)` |  Washer  M2.5 x 5.9mm x 0.5mm |
-|   3 | `washer(M3_washer)` |  Washer  M3 x 7mm x 0.5mm |
-|   3 | `washer(M4_washer)` |  Washer  M4 x 9mm x 0.8mm |
-|   3 | `star_washer(M2_washer)` |  Washer star M2 x 0.3mm |
-|   3 | `star_washer(M2p5_washer)` |  Washer star M2.5 x 0.5mm |
-|   3 | `star_washer(M3_washer)` |  Washer star M3 x 0.5mm |
-|   3 | `star_washer(M4_washer)` |  Washer star M4 x 0.8mm |
+|   5 | `insert(F1BM2)` |  Heatfit insert M2 |
+|   5 | `insert(F1BM2p5)` |  Heatfit insert M2.5 |
+|   5 | `insert(F1BM3)` |  Heatfit insert M3 |
+|   5 | `insert(F1BM4)` |  Heatfit insert M4 |
+|   5 | `screw(M2_cap_screw, 8)` |  Screw M2 cap x  8mm |
+|   5 | `screw(M2p5_pan_screw, 10)` |  Screw M2.5 pan x 10mm |
+|   5 | `screw(M3_dome_screw, 10)` |  Screw M3 dome x 10mm |
+|   5 | `screw(M4_dome_screw, 12)` |  Screw M4 dome x 12mm |
+|   5 | `washer(M2_washer)` |  Washer  M2 x 5mm x 0.3mm |
+|   5 | `washer(M2p5_washer)` |  Washer  M2.5 x 5.9mm x 0.5mm |
+|   5 | `washer(M3_washer)` |  Washer  M3 x 7mm x 0.5mm |
+|   5 | `washer(M4_washer)` |  Washer  M4 x 9mm x 0.8mm |
+|   5 | `star_washer(M2_washer)` |  Washer star M2 x 0.3mm |
+|   5 | `star_washer(M2p5_washer)` |  Washer star M2.5 x 0.5mm |
+|   5 | `star_washer(M3_washer)` |  Washer star M3 x 0.5mm |
+|   5 | `star_washer(M4_washer)` |  Washer star M4 x 0.8mm |

 ### Printed
 | Qty | Filename |
 | ---:|:--- |
+|   1 | 2screw_block_M20.stl |
+|   1 | 2screw_block_M25.stl |
+|   1 | 2screw_block_M30.stl |
+|   1 | 2screw_block_M40.stl |
 |   1 | corner_block_M20.stl |
 |   1 | corner_block_M25.stl |
 |   1 | corner_block_M30.stl |
@ -4867,6 +4884,10 @@ Star washers can be omitted by setting `star_washers` to false.
 ### Assemblies
 | Qty | Name |
 | ---:|:--- |
+|   1 | 2screw_block_M20_assembly |
+|   1 | 2screw_block_M25_assembly |
+|   1 | 2screw_block_M30_assembly |
+|   1 | 2screw_block_M40_assembly |
 |   1 | corner_block_M20_assembly |
 |   1 | corner_block_M25_assembly |
 |   1 | corner_block_M30_assembly |
--- a/tests/corner_block.scad
+++ b/tests/corner_block.scad
@ -22,11 +22,18 @@ use <../printed/corner_block.scad>
 screws = [M2_cap_screw, M2p5_pan_screw, M3_dome_screw, M4_dome_screw];

 module do_corner_block(screw)
-    if($preview)
+    if($preview) {
        fastened_corner_block_assembly(3, screw = screw);
-    else
+
+        translate([0, 30])
+            fastened_2screw_block_assembly(3, screw = screw);
+    }
+    else {
        corner_block(screw);

+        translate([0, 30])
+            2screw_block(screw);
+    }
 module corner_blocks()
    for(i = [0 : len(screws) - 1])
        translate([i * 30, 0])
--- a/tests/png/corner_block.png
+++ b/tests/png/corner_block.png