X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=rc-landing-gear.scad;h=c2baa83d960bb5453c29231cb888ec6bafde23a7;hb=HEAD;hp=e6bf3a502a04b3c357ed018a02f497708fbc9411;hpb=6b3bdb2d47095ea4db9e40d6bd50fa85aeac3f52;p=things.git

diff --git a/rc-landing-gear.scad b/rc-landing-gear.scad
index e6bf3a5..c2baa83 100644
--- a/rc-landing-gear.scad
+++ b/rc-landing-gear.scad
@@ -1,126 +1,111 @@
 eps = 0.01;
 infty = 300;
 
-base_d = 70;
-base_y_scale = 0.7;
-base_wall = 1.25;
+/*
+sirka trupu u nabezne hrany 80mm
+max sirka trupu 90 mm
+sirka trupu 50mm pred nabeznou hranou 84mm
+rozchod klidne 150mm
+vyska osy se spodni hranou trupu az cca 30mm pod trupem
+kolma cast asi vpredu
+*/
 
-base_l = 80;
-base_w = 30;
+base_h = 95;
+base_w = 83;
+base_top = 5; // above the xz plane
+base_wall = 0.6;
+base_l = 45;
 
-rear_angle = 75;
 
-wheel_base = 70;
-wheel_h = 50;
-wheel_axle_cube = 5;
+axle_cube = 7;
+axle_hole = 3.5;
 
-axle_hole = 2;
+strut_wall = 1.2;
+base_top_l = axle_cube;
 
-beam_w = 1.5;
-beam_h = 5;
-top_beam_h = 12;
+bottom_strut_l = base_l-5;
 
-spring_clip_l = 3.5;
-spring_clip_w = base_w - 5;
-spring_dist = 10;
+wheel_h = 60;
+wheel_base = 110;
 
-module rear_cyl() {
-	translate([0, 0, -beam_w*sin(rear_angle)/2])
-	rotate([rear_angle-90, 0, 0])
-		cylinder(r = beam_w/2, h = beam_h/sin(rear_angle), $fn = 32);
+module base() {
+	difference() {
+		$fn = 128;
+		scale([base_w/base_h, 1, 1])
+			cylinder(r = base_h/2, h = base_l);
+		// cut the top half
+		translate([-infty/2, base_top, -infty/2]) cube(infty);
+	
+		// cut the rear angle
+		translate([0, base_top, base_top_l])
+		rotate([-atan((base_l - base_top_l)/(base_h/2 + base_top)), 0, 0])
+		translate([-infty/2, -infty/2, 0]) cube(infty);
+	}
 }
 
-module front_cyl() {
-	rotate([rear_angle-90, 0, 0])
-		cylinder(r = beam_w/2, h = beam_h, $fn = 32);
+module wheel_cube()
+{
+	translate([wheel_base/2-axle_cube, 
+		-wheel_h-axle_cube/2, 0])
+		cube(axle_cube);
 }
 
-module top_cyl() {
-	rotate([rear_angle-90, 0, 0])
-		cylinder(r = beam_w/2, h = top_beam_h, $fn = 32);
+module top_strut() {
+	hull() {
+		// top
+		translate([base_w/2 - strut_wall/2, 0, 0])
+			cylinder(r = strut_wall/2, h = base_top_l, $fn = 16);
+		// bottom
+		translate([wheel_base/2-strut_wall/2,
+			-wheel_h+axle_cube/2, 0])
+			cylinder(r = strut_wall/2, h = axle_cube, $fn = 16);
+	}
 }
 
-module body() {
-	rotate([rear_angle-90, 0, 0])
-	translate([0, -sqrt(pow(base_d*base_y_scale/2,2) - pow(base_w*base_y_scale/2,2)), 0])
-	difference() {
-		// outer cylinder
-		scale([1, base_y_scale, 1])
-			cylinder(r = base_d/2, h = base_l);
-		// cut the sides
-		for (i = [-1, 1]) scale ([i, 1, 1])
-			translate([base_w/2, -infty/2, -infty/2])
-				cube(infty);
-		// cut the rear
-		translate([-infty/2, -infty, -infty/2]) cube(infty);
+module bottom_strut() {
+	hull() {
+		// center
+		rotate([0, 0, 30])
+		translate([0, -base_w/2 + base_wall/2, 0])
+			cylinder(r = strut_wall/2, h = bottom_strut_l, $fn = 16);
+		// side
+		// translate([wheel_base/2-axle_cube+strut_wall/2,
+		// 	-wheel_h+axle_cube/2-strut_wall/2 , 0])
+		translate([wheel_base/2-strut_wall/2,
+			-wheel_h-axle_cube/2+strut_wall/2 , 0])
+			cylinder(r = strut_wall/2, h = axle_cube, $fn = 16);
 	}
+}
 
-	// wheel axle cubes
-	for (i = [-1, 1]) scale([i, 1, 1])
-		translate([wheel_base/2 - wheel_axle_cube, wheel_h - wheel_axle_cube/2, 0])
-			cube(wheel_axle_cube);
-
-	// rear beams
-	for (i = [-1, 1]) scale([i,1,1])
-		hull() {
-			translate([-(base_w/2-beam_w/2), spring_dist, 0])
-				rear_cyl();
-			translate([wheel_base/2-beam_w/2, wheel_h, 0])
-				rear_cyl();
-		}
-
-	// spring top
-	hull() {
-		for (j = [-1, 1])
-			translate([j*(base_w/2-beam_w/2), spring_dist, 0])
-				rear_cyl();
+module horiz_strut() {
+	translate([-wheel_base/2, -wheel_h-axle_cube/2, 0])
+		cube([wheel_base, strut_wall, axle_cube]);
+}
+
+module body() {
+	base();
+
+	for (x = [-1, 1]) scale([x, 1, 1]) {
+		wheel_cube();
+		top_strut();
+		bottom_strut();
 	}
 
-	// spring sides
-	for (i = [-1, 1]) scale([i,1,1])
-		hull() {
-			translate([(base_w/2+beam_w), 0, 0])
-				rear_cyl();
-			translate([(base_w/2-beam_w/2), spring_dist, 0])
-				rear_cyl();
-		}
-
-	// front beams
-	for (i = [-1, 1]) scale([i,1,1])
-		for (j = [-1, 1]) hull() {
-			translate([j*(base_w/2-beam_w/2), (base_l-top_beam_h)*cos(rear_angle), (base_l-top_beam_h)*sin(rear_angle)])
-				top_cyl();
-			translate([wheel_base/2-beam_w/2, wheel_h, 0])
-				front_cyl();
-		}
-
-	// spring rear clip
-	translate([-spring_clip_w/2, 0, 0])
-		cube([spring_clip_w, spring_clip_l, base_wall]);
-
-	// spring clip sides
-	for (i = [-1, 1]) scale([i,1,1])
-		hull() {
-			translate([(base_w/2-beam_w/2), 0, 0])
-				rear_cyl();
-			translate([(base_w/2-beam_w/2), spring_clip_l - 1.5*beam_w, 0])
-				rear_cyl();
-		}
+	horiz_strut();
 }
 
 difference() {
 	body();
 
-	// inner cylinder hole
-	rotate([+rear_angle-90, 0, 0])
-	translate([0, -sqrt(pow(base_d*base_y_scale/2,2) - pow(base_w*base_y_scale/2,2)), -infty/2])
-		scale([1, 1*base_y_scale, 1])
-			cylinder(r = base_d/2 - base_wall, h = infty);
-	// cut the bottom
-	translate([-infty/2, -infty/2, -infty]) cube(infty);
-	// wheel axle hole
-	translate([-infty/2, wheel_h, wheel_axle_cube/2])
+	// hole in the base, no matter what gets in
+	translate([0, 0, -eps])
+		scale([(base_w - base_wall)/(base_h - base_wall), 1, 1])
+	 	cylinder(r = base_h/2 - base_wall, h = base_l + 2*eps, $fn=128);
+
+	// hole for the wheel axle
+	translate([-infty/2, -wheel_h, axle_cube/2])
 		rotate([0, 90, 0])
-			cylinder(r = axle_hole/2, h = infty);
+		rotate([0, 0, 90])
+		cylinder(r = axle_hole/2, h = infty);
 }