From: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Date: Mon, 6 Feb 2017 09:35:22 +0000 (+0100)
Subject: rc landing gear: another approach
X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=commitdiff_plain;h=4b9544fdc7fb01ea6c3e58e203f9a68fd717e697;p=things.git

rc landing gear: another approach
---

diff --git a/rc-landing-gear.scad b/rc-landing-gear.scad
index e6bf3a5..71d67f7 100644
--- a/rc-landing-gear.scad
+++ b/rc-landing-gear.scad
@@ -1,126 +1,122 @@
 eps = 0.01;
 infty = 300;
 
-base_d = 70;
-base_y_scale = 0.7;
-base_wall = 1.25;
-
-base_l = 80;
-base_w = 30;
-
-rear_angle = 75;
-
-wheel_base = 70;
-wheel_h = 50;
-wheel_axle_cube = 5;
-
-axle_hole = 2;
-
-beam_w = 1.5;
-beam_h = 5;
-top_beam_h = 12;
+/*
+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_d = 80;
+base_w = base_d;
+base_wall = 2;
+base_l = 50;
+
+wheel_h = 40 + base_d/2; // under the base_d/2
+wheel_base = 160;
+
+axle_cube = 10;
+axle_hole = 3;
+
+leg_wall = 2;
+top_l = axle_cube;
+
+	// bottom arc
+	difference() {
+		$fn = 128;
+		cylinder(r = base_d/2, h = base_l);
+		translate([0, 0, -eps])
+			cylinder(r = base_d/2 - base_wall, h = base_l + 2*eps);
+		// cut the top half
+		translate([-infty/2, 0, -infty/2]) cube(infty);
+		// angled cut to top_l
+		translate([0, 0, top_l])
+		rotate([atan((base_d/2-base_wall)/(base_l - top_l)), 0, 0])
+		translate([-infty/2, 0, -infty/2]) cube(infty);
+	}
 
-spring_clip_l = 3.5;
-spring_clip_w = base_w - 5;
-spring_dist = 10;
+	// wheel cubes
+	difference() {
+		for (x = [-1, 1]) scale([x, 1, 1])
+			translate([wheel_base/2-axle_cube, 
+				-wheel_h-axle_cube/2, 0])
+				cube(axle_cube);
+		translate([-infty/2, -wheel_h, axle_cube/2])
+			rotate([0, 90, 0])
+			cylinder(r = axle_hole/2, h = infty);
+	}
 
-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);
-}
+	// bottom struts
+	for (x = [-1, 1]) scale([x, 1, 1]) hull() {
+		// center
+		translate([0, -base_d/2 + base_wall/2, 0])
+			cylinder(r = leg_wall/2, h = base_l, $fn = 16);
+		// side
+		translate([wheel_base/2-axle_cube+leg_wall/2,
+			-wheel_h+axle_cube/2-leg_wall/2 , 0])
+			cylinder(r = leg_wall/2, h = axle_cube, $fn = 16);
+	}
 
-module front_cyl() {
-	rotate([rear_angle-90, 0, 0])
-		cylinder(r = beam_w/2, h = beam_h, $fn = 32);
-}
+	// top struts
+	for (x = [-1, 1]) scale([x, 1, 1]) hull() {
+		// top
+		translate([base_d/2 - base_wall/2, -leg_wall/2, 0])
+		 	cylinder(r = leg_wall/2, h = top_l+1, $fn = 16);
+		// bottom
+		translate([wheel_base/2-leg_wall/2,
+			-wheel_h+axle_cube/2-leg_wall/2 , 0])
+			cylinder(r = leg_wall/2, h = axle_cube, $fn = 16);
+	}
 
-module top_cyl() {
-	rotate([rear_angle-90, 0, 0])
-		cylinder(r = beam_w/2, h = top_beam_h, $fn = 32);
-}
 
+/*
 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])
+	// bottom arc
+	difference() {
+		cylinder(r = base_d/2, h = base_l);
+		translate([0, 0, -eps])
+			cylinder(r = base_d/2 - base_wall, h = base_l + 2*eps);
+		translate([-infty/2, 0, -infty/2]) cube(infty);
+	}
+
+	// side top arcs
+	for (x = [-1, 1]) scale([x, 1, 1])
+	translate([base_d/2+side_d/2-base_wall, 0, 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
+		cylinder(r = side_d/2, h = base_l);
+		translate([0, 0, -eps])
+			cylinder(r = side_d/2 - base_wall, h = base_l + 2*eps);
 		translate([-infty/2, -infty, -infty/2]) cube(infty);
 	}
 
-	// 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
+	// side beams
+	for (x = [-1, 1]) scale([x, 1, 1])
+	translate([base_d/2 + side_d-2*base_wall, -base_d/2-wheel_h, 0])
+		cube([base_wall, base_d/2+wheel_h, base_l]);
+
+	// bottom springs
+	for (x = [-1, 1]) scale([x, 1, 1])
 	hull() {
-		for (j = [-1, 1])
-			translate([j*(base_w/2-beam_w/2), spring_dist, 0])
-				rear_cyl();
+		translate([0, -base_d/2, 0]) cube([base_wall, base_wall, base_l]);
+		translate([base_d/2+side_d-2*base_wall, -base_d/2-wheel_h, 0]) cube([base_wall, base_wall, base_l]);
 	}
-
-	// 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();
-		}
+	// wheel cubes
+	for (x = [-1, 1]) scale([x, 1, 1])
+		translate([base_d/2+side_d-2*base_wall, -base_d/2-wheel_h-axle_cube/2, 0])
+			cube(axle_cube);
 }
 
 difference() {
 	body();
+	for (x = [-1, 1]) scale([x, 1, 1])
+	translate([base_d/2+wheel_h, -base_d/2-wheel_h, axle_cube])
+	translate([-infty/2, -base_d/2-wheel_h, axle_cube/2])
+	% rotate([0, 90, 0])
+		cylinder(r = axle_hole/2, h = infty);
 
-	// 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])
-		rotate([0, 90, 0])
-			cylinder(r = axle_hole/2, h = infty);
 }
 
+*/