Adds slider design for PCB holders

Author: Felix "xq" Queißner

Hardware/Case/case.scad

@@ -10,12 +10,12 @@ include <parts/backplane.scad>
 include <parts/frontpanel.scad>
 include <parts/slot_plate.scad>
 include <parts/slot_pcb.scad>
+include <parts/pcb_slider.scad>
 
 include <expansions.scad>
 
 HIDE_TOP = true;
 
-baseplate_spread = 41.4;
 
 translate([0,0,-baseplate_spread]) mat_glass() baseplate_mount_plate();
 
@@ -25,13 +25,13 @@ if(!HIDE_TOP)
 }
 
 translate([0,backplane_offset,0]) {
-//    mat_pcb() xrotate(90) backplane();
+   mat_pcb() xrotate(90) backplane();
 
-//    foreach_slot()
-//    {
-//         zadjust = 5;
-//         translate([slot_pcb_offset,0,-slot_pcb_conn_offset+zadjust]) xrotate(-90) conn_pcie_x4();
-//    }
+    foreach_slot()
+    {
+        zadjust = 5;
+        translate([slot_pcb_offset,0,-slot_pcb_conn_offset+zadjust]) xrotate(-90) conn_pcie_x4();
+    }
     translate([0,-0.8,0]) yrotate(180) xrotate(-90) import("../Mechanical Prototype/Backplane/Backplane.stl");
 }
 
@@ -43,8 +43,11 @@ translate([0,169/2,0])
     {
         // translate([0,-0.8,0]) yrotate(180) xrotate(-90) 
          translate([slot_pcb_offset-slot_pcb_thickness/2,-slot_plate_thickness/2,0])
-        zrotate(-90) xrotate(-90) import("../Mechanical Prototype/Expansion Board/Expansion Board.stl");
+        color("green") zrotate(-90) xrotate(-90) import("../Mechanical Prototype/Expansion Board/Expansion Board.stl");
+        
         xcon_slot_plate() xcon_expansion_dummy($i);
+
+        color("gray") zmirror() translate([slot_pcb_offset,-slot_pcb_length/2-slot_plate_thickness/2,-baseplate_spread + baseplate_thickness/2]) pcb_slider();
 
         // translate([slot_pcb_offset,-slot_pcb_length/2-slot_plate_thickness/2,0])  mat_pcb() slot_pcb();
 

Hardware/Case/justfile

@@ -6,6 +6,7 @@ render-all: \
     (render "frontpanel") \
     (render "slot_plate") \
     (render "slot_plate_dummy") \
+    (render "pcb_slider") \
     (render "slot_pcb") \
     (exp-slot "0") \
     (exp-slot "1") \

Hardware/Case/parts/baseplate.scad

@@ -1,5 +1,6 @@
 use <../lib/common.scad>
 include <parameters.scad>
+include <pcb_slider.scad>
 
 module baseplate_mount_plate_2d()
 {
@@ -20,12 +21,31 @@ module baseplate_mount_plate_2d()
 
         translate([0,backplane_offset]) square([backplane_inset_width + backplane_padding, backplane_thickness + backplane_padding], true);
 
+        // Cutouts for the pcb_slider mounting points:
+
+        translate([0,169/2])
+        {
+            foreach_slot()
+            {
+                translate([slot_pcb_offset,-slot_pcb_length/2+1]) // TODO: Figure out this "1" here!
+                {
+                    tdist = pcb_slider_length - 2 * pcb_slider_hole_margin;
+                    hdist = tdist / (pcb_slider_holes-1);
+                    for($i = [0: pcb_slider_holes-1]) {
+                            off = hdist * $i -(pcb_slider_length/2 - pcb_slider_hole_margin);
+
+                            translate([0,off]) screw_hole_2d(pcb_slider_hole_screw);
+                    }   
+                }
+            }
+        }
+
         // Cutouts to fit the case, symmetric on x and y axis:
         xymirror2d()
         {
             // mounting holes:
-            translate(hole1_dist) circle(d = hole_size);
-            translate(hole2_dist) circle(d = hole_size);
+            translate(hole1_dist) circle(d = hole_size, $fn=20);
+            translate(hole2_dist) circle(d = hole_size, $fn=20);
 
             // corner cutouts:
             translate([ x_inset + r_inset, y_inset + r_inset ]) circle(r = r_inset);
@@ -49,3 +69,5 @@ if (RENDER_PART_3D)
 {
     baseplate_mount_plate();
 }
+
+// baseplate_mount_plate_2d();

Hardware/Case/parts/parameters.scad

@@ -49,7 +49,8 @@ slot_mount_screw_pcb_dist = 6.4; // mm distance from the PCB top
 slow_mount_screw_type = UNC_4_40;
 
 // Baseplate
-baseplate_thickness = 2.0;
+baseplate_thickness = 2.0; // Thickness of the baseplate
+baseplate_spread = 41.4; // Distance between "center" and baseplate surface
 
 // Backplane
 
@@ -64,6 +65,17 @@ backplane_inset_height = 80.5;
 // Frontpanel
 frontpanel_thickness = 2.0;
 
+// PCB Sliders
+
+pcb_slider_pcb_margin = 0.15;
+pcb_slider_height = 6.6; // mm
+pcb_slider_width_top = 4; // mm
+pcb_slider_width_bot = 5; // mm
+pcb_slider_holes = 3;
+pcb_slider_hole_margin = 10; // mm
+pcb_slider_case_margin = 5; // mm
+pcb_slider_hole_screw = M2_5;
+
 // Automation Variables:
 RENDER_PART_2D = false;
 RENDER_PART_3D = false;
@@ -72,6 +84,14 @@ RENDER_PART_3D = false;
 
 slot_screw_offset = slot_plate_height/2-slot_screw_inset;
 
+pcb_slider_depth = baseplate_spread - baseplate_thickness/2 - slot_pcb_height / 2 - pcb_slider_pcb_margin; // mm
+pcb_slider_notch_width_top = slot_pcb_thickness + 4 * pcb_slider_pcb_margin; // mm
+pcb_slider_notch_width_bot = slot_pcb_thickness + 2 * pcb_slider_pcb_margin; // mm
+pcb_slider_length = slot_pcb_length - 2 * pcb_slider_case_margin; // mm
+
+echo(pcb_slider_depth, pcb_slider_height);
+assert(pcb_slider_depth < pcb_slider_height);
+
 // Utility modules
 
 /* Invokes children() once for each slot, offsetted on the X axis, slot center. */

Hardware/Case/parts/pcb_slider.scad

@@ -0,0 +1,52 @@
+include <parameters.scad>
+use <../lib/common.scad>
+
+module pcb_slider_2d()
+{
+    size = [ slot_pcb_height, slot_pcb_length ];
+
+    h = pcb_slider_height;
+    hi = pcb_slider_depth; // TODO
+    wot = pcb_slider_width_top / 2;
+    wob = pcb_slider_width_bot / 2;
+    wit = pcb_slider_notch_width_top / 2;
+    wib = pcb_slider_notch_width_bot / 2;
+
+    polygon(points=[
+        [-wob,0],
+        [-wot,h],
+        [-wit,h],
+        [-wib,hi],
+        [wib,hi],
+        [wit,h],
+        [wot,h],
+        [wob,0],
+    ]);
+}
+
+module pcb_slider()
+{   
+    tdist = pcb_slider_length - 2 * pcb_slider_hole_margin;
+    hdist = tdist / (pcb_slider_holes-1);
+    
+    render() difference() 
+    {
+        xrotate(90) linear_extrude(height = pcb_slider_length, center=true) pcb_slider_2d();
+        union() for($i = [0: pcb_slider_holes-1]) {
+            off = hdist * $i -(pcb_slider_length/2 - pcb_slider_hole_margin);
+
+            translate([0,off,-1]) linear_extrude(height=pcb_slider_depth) screw_shaft_2d(pcb_slider_hole_screw);
+        }   
+
+    }
+}
+
+if (RENDER_PART_2D)
+{
+    pcb_slider_2d();
+}
+
+if (RENDER_PART_3D)
+{
+    pcb_slider();
+}