X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=light-bracket.scad;h=f64e81c7a8d1661ea0aff2bfa821b76ab11df5ad;hp=7c97461b64cb690e4201b94b914e2d2a20d98b7a;hb=26d53245e6556d95c2a893802c3e91bd38a45876;hpb=cb71228ec07b200c81bc9a6bca7e6e9b6f3ae634

diff --git a/light-bracket.scad b/light-bracket.scad
index 7c97461..f64e81c 100644
--- a/light-bracket.scad
+++ b/light-bracket.scad
@@ -1,11 +1,20 @@
-remote_width=56.2;
-remote_height=124.7;
-remote_thick=6.8;
+shrinkage = 1.0126; // width of 56.2 gives 55.5
+remote_width= 56.2 * shrinkage;
+remote_height=124.7 * shrinkage;
+remote_thick=7.3; // height of 6.8 gives 6.3
 mainhole_thick=remote_thick+1;
 hook_hook_thick=1.5;
 hook_stem_thick=1.5;
 hook_hook_len=1.5;
-base_thick=10;
+base_thick=3.5;
+base_margin=3.0;
+base_width=remote_width-base_margin*2;
+base_height=remote_height-base_margin*2;
+base_edgewidth=4;
+
+screw_ys=[ 28, remote_height-28 ];
+
+// origin is base of mainhole
 
 module mainhole() {
 	translate([ -remote_width/2, 0, 0 ])
@@ -16,9 +25,12 @@ module mainhole() {
 module hhook(extent) {
 	difference() {
 		translate([ -hook_stem_thick, 0, -base_thick*2 ])
-			cube(center=false, size=[ hook_stem_thick+15, extent,
-				base_thick*2 + mainhole_thick
-					+ hook_hook_thick ]);
+			cube(center=false,
+				size=[
+			hook_stem_thick+base_margin+base_edgewidth-1,
+			extent,
+			base_thick*2 + mainhole_thick + hook_hook_thick
+					]);
 		translate([hook_hook_len, -5, 0])
 			 cube(center=false, size=[ 20, extent+10, 30 ]);
 	}
@@ -39,13 +51,67 @@ module hstuff() {
 	translate([-10,0,0]) hhookbot(15);
 }
 
+module slashes() {
+	for (y=[-30 : 60 : +40])
+		translate([0,y,0])
+			rotate(v=[0,0,1],a=45)
+				cube(center=true, [ 5,200,200 ]);
+}
+
+module base() {
+	translate([ 0, base_height/2 + base_margin, -base_thick/2 ])
+	intersection() {
+		cube(center=true,
+			[ base_width, base_height, base_thick+10 ]);
+		union() {
+			difference() {
+				cube(center=true, [ 200,200,200 ]);
+				cube(center=true,
+					[ base_width - base_edgewidth*2,
+					  base_height - base_edgewidth*2,
+					  base_thick + 15 ]);
+				
+			}
+			slashes();
+			mirror([1,0,0]) slashes();
+		}
+	}
+//	translate([-base_width/2, base_margin, -base_thick*2])
+//		cube(center=false, [base_width,base_height,base_thick+10]);
+}
+
 module stuff() {
 	hstuff();
 	mirror([1,0,0]) hstuff();
+	base();
+	for (y=screw_ys) translate([0, y, -20])
+		cylinder(r=6.5, h=21);
+}
+
+module screwhole(holedia, csdia) {
+	// screw goes along z axis downwards
+	// origin is top of head
+	// results are positive, so this should be subtracted
+	translate([0,0,-100]) cylinder(h=200, r=holedia/2);
+	csdist=(csdia-holedia)/2;
+	translate([0,0,-csdist]) cylinder(h=csdist, r1=holedia/2, r2=csdia/2);
+	cylinder(h=100, r=csdia/2);
+}
+
+module bracket() {
+	// this is the actual thing we want
+	difference() {
+		stuff();
+		mainhole();
+		for (y=screw_ys) translate([0, y, 0])	
+			screwhole(5,9); //dia=4 gives 2.9
+					 //holedia=10 gives 9.0 want 7.0
+		translate([0,0,-50 - base_thick])
+			cube(center=true,[300,300,100]); // print bed
+	}
 }
 
-difference() {
-	stuff();
-	mainhole();
-	translate([0,0,-50 - base_thick]) cube(center=true,[300,300,100]);
+intersection() {
+	!bracket();
+	cube(center=true, [100,55,100]);
 }