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//
/*
* OpenSCAD Shapes Library (www.openscad.at)
* Foot for Mendel Y platform
* by Vik Olliver. Based on examples which are:
* Copyright (C) 2009 Catarina Mota <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
m4_clearance_rad=2.8;
m6_clearance_rad=3.7;
m8_clearance_rad=4.7;
post_wid=20;
module box(w,h,d) {
scale ([w,h,d]) cube(1, true);
}
module roundedBox(w,h,d,f){
difference(){
box(w,h,d);
translate([-w/2,h/2,0]) cube(w/(f/2),true);
translate([w/2,h/2,0]) cube(w/(f/2),true);
translate([-w/2,-h/2,0]) cube(w/(f/2),true);
translate([w/2,-h/2,0]) cube(w/(f/2),true);
}
translate([-w/2+w/f,h/2-w/f,-d/2]) cylinder(d,w/f, w/f);
translate([w/2-w/f,h/2-w/f,-d/2]) cylinder(d,w/f, w/f);
translate([-w/2+w/f,-h/2+w/f,-d/2]) cylinder(d,w/f, w/f);
translate([w/2-w/f,-h/2+w/f,-d/2]) cylinder(d,w/f, w/f);
}
module hexagon(height, depth) {
boxWidth=height/1.75;
union(){
box(boxWidth, height, depth);
rotate([0,0,60]) box(boxWidth, height, depth);
rotate([0,0,-60]) box(boxWidth, height, depth);
}
}
module spring() {
// Chop alternating slices out to make a spring.
difference () {
// Spring body
translate ([0,0,post_wid/2]) cube(post_wid, center=true);
// Slots in spring
translate ([-post_wid*0.2,0,post_wid*0.25]) {
cube([post_wid*1,post_wid*1.1,post_wid*0.15], center=true);
}
translate ([post_wid*0.2,0,post_wid*0.5]) {
cube([post_wid*1,post_wid*1.1,post_wid*0.15], center=true);
}
translate ([-post_wid*0.2,0,post_wid*0.75]) {
cube([post_wid*1,post_wid*1.1,post_wid*0.15], center=true);
}
}
}
module post_trimmer () {
translate ([0,-post_wid,0]) rotate ([30,0,0]) translate ([0,post_wid/2,post_wid/2])
cube(post_wid,center=true);
}
module y_foot_base () {
scale ([2.5,2.5,1]) difference () {
translate ([0,0,post_wid/2]) cube(post_wid,center=true);
post_trimmer(post_wid);
rotate ([0,0,90]) post_trimmer(post_wid);
rotate ([0,0,180]) post_trimmer(post_wid);
rotate ([0,0,270]) post_trimmer(post_wid);
translate ([0,0,post_wid]) cube(post_wid,center=true);
}
}
module y_foot_top() {
difference () {
translate ([0,0,post_wid*0.15])cube([post_wid*2.1,post_wid,post_wid*0.3],center=true);
translate ([0,0,post_wid*0.35]) rotate ([90,0,0]) cylinder(r=4, h=80,center=true);
}
}
module m4_hole_horiz(l) {
cylinder(l,m4_clearance_rad,m4_clearance_rad,center=true);
translate ([m4_clearance_rad*0.6,0,0]) rotate ([0,0,45])
cube([m4_clearance_rad,m4_clearance_rad,l],center=true);
}
module m6_hole_horiz(l) {
cylinder(l,m6_clearance_rad,m6_clearance_rad,center=true);
translate ([m6_clearance_rad*0.6,0,0]) rotate ([0,0,45])
cube([m6_clearance_rad,m6_clearance_rad,l],center=true);
}
module m8_hole_horiz(l) {
cylinder(l,m8_clearance_rad,m8_clearance_rad,center=true);
translate ([m8_clearance_rad*0.6,0,0]) rotate ([0,0,45])
cube([m8_clearance_rad,m8_clearance_rad,l],center=true);
}
// We'll have pan-head screws today please.
screwhead=1;
module y_foot () {
difference () {
translate ([0,post_wid/2,0]) difference () {
union () {
y_foot_base();
// Box for nuts to rest on.
translate([0,0,5]) cube([post_wid*1.6,post_wid,10],center=true);
translate ([post_wid*1.35,0,post_wid*0.3]) spring();
translate ([post_wid*-1.35,0,post_wid*0.3]) rotate ([0,0,180]) spring();
translate ([0,0,post_wid*1.1]) y_foot_top();
}
translate ([11,0,0]) rotate ([0,0,90]) m4_hole_horiz(100);
translate ([-11,0,0]) rotate ([0,0,90]) m4_hole_horiz(100);
// Holes for heads of screws
translate ([11,0,0]) rotate([0,0,90]) m8_hole_horiz(l=7);
translate ([-11,0,0]) rotate([0,0,90]) m8_hole_horiz(l=7);
// and nut sockets.
translate ([11,0,post_wid*0.65]) rotate ([0,0,30]) hexagon(height=8.5,depth=10);
translate ([-11,0,post_wid*0.65]) rotate ([0,0,30]) hexagon(height=8.5,depth=10);
}
// Chop off one side to give a flat printing surface.
translate ([0,-post_wid*1.5,0]) cube(post_wid*3,center=true);
// Take out holes for small woodscrews.
translate ([0,post_wid*1.5,-3.5]) small_woodscrew(head=screwhead);
translate ([post_wid*0.9,post_wid*1.2,-3.5]) small_woodscrew(head=screwhead);
translate ([-post_wid*0.9,post_wid*1.2,-3.5]) small_woodscrew(head=screwhead);
}
}
rotate ([90,0,90]) y_foot();
//y_foot();
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