Model for press-in belt

[clinton/prusa3.git] / box_frame / inc / functions.scad

diff --git a/box_frame/inc/functions.scad b/box_frame/inc/functions.scad
index 4695079..470644b 100644 (file)
--- a/box_frame/inc/functions.scad
+++ b/box_frame/inc/functions.scad
@@ -32,11 +32,15 @@ module cylinder_poly(r, h, center=false){
 
 module fillet(radius, height=100, $fn=0) {
     //this creates acutal fillet
-    translate([-radius, -radius, -height/2-0.01])
-        difference() {
-            cube([radius*2, radius*2, height+0.02]);
-            cylinder(r=radius, h=height+0.02, $fn=$fn);
+    translate([-radius, -radius, -height / 2 - 0.02]) difference() {
+        cube([radius * 2, radius * 2, height + 0.04]);
+        if ($fn == 0 && (radius == 2 || radius == 3 || radius == 4)) {
+            cylinder(r=radius, h=height + 0.04, $fn=4 * radius);
+        } else {
+            cylinder(r=radius, h=height + 0.04, $fn=$fn);
         }
+
+    }
 }
 
 module cube_fillet(size, radius=-1, vertical=[3,3,3,3], top=[0,0,0,0], bottom=[0,0,0,0], center=false, $fn=0){
@@ -135,15 +139,26 @@ function idler_assy_r_outer(idler_bearing) = (idler_bearing[0] / 2) + (idler_bea
 
 module idler_assy(idler_bearing = [22, 7, 8, 1]) {
 
-    translate([0,0,-1]) cylinder(h = 120, r=idler_bearing[2]/2 + 1, $fn=7, center=true);
+    translate([0,0,-1]) cylinder(h = 120, r=(idler_bearing[2] + 1) / 2, $fn=7, center=true);
     //bearing shadow
     %cylinder(h = idler_bearing[1], r=idler_bearing[0]/2, center=true);
 
-    cylinder(h = idler_width + 1, r=idler_assy_r_outer(idler_bearing), center=true);
+    cylinder(h = idler_width + 1, r=idler_assy_r_outer(idler_bearing) + 0.5, center=true);
 }
 
+module belt(len, side = 0){
+    //belt. To be substracted from model
+    //len is in +Z, smooth side in +X, Y centered
+    translate([-0.5, 0, 0]) maketeeth(len);
+    translate([0, -5, -0.01]) cube([belt_thickness, 10, len + 0.02]);
+    if (side != 0) {
+    translate([0, -5 + side, -0.01]) cube_fillet([belt_thickness, 10, len + 0.02], vertical = [3, 0, 0, 0]);
+    }
+}
+
+
 module maketeeth(len){
-    //Belt teeth. To be substracted from model
+    //Belt teeth. 
     for (i = [0 : len / belt_tooth_distance]) {
         translate([0, 0, i * belt_tooth_distance]) cube([2, 10, belt_tooth_distance * belt_tooth_ratio], center = true);
     }