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//
/*
* OpenSCAD Shapes Library (www.openscad.at)
* One-piece X Motor bracket for Mendel
* 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
*
*/
x_rail_sep=60.5-8;
lower_bracket_width=84;
lower_bracket_base_width=9;
lower_bracket_base_height=15;
lower_bracket_length=63; // Also max dimension on X axis
top_notch_height=lower_bracket_length+7.5;
nema17_side=45;
// Useful constants etc.
m3_clearance_rad=1.9;
m4_clearance_rad=2.9;
m6_clearance_rad=3.7;
m8_tight_rad=4.6;
m8_clearance_rad=4.9;
// The rail clamps.
rail_clamp_width=20;
rail_clamp_height=15;
rail_rad=m8_tight_rad; // m8_tight_rad, 5.2 for aluminium tube or 3.8 for 1/4 inch rail.
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 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 m4_hole_vert(l) {
cylinder(l,m4_clearance_rad,m4_clearance_rad,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);
}
// No .4 3/4 inch countersunk woodscrew (includes a lot of headspace)
module small_woodscrew() {
rotate ([0,0,30]) {
translate ([0,0,-7.5]) cylinder(h=3,r1=0.2,r2=1.8,center=true);
cylinder(h=12,r1=1.8,r2=2.0,center=true);
translate([0,0,6]) cylinder(h=4, r1=2.0, r2=4.0);
}
}
module m4_nut_cavity(l) {
hexagon(height=8,depth=l);
}
module m4_hole_vert_with_hex(l) {
union () {
m4_hole_vert(l);
translate ([0,0,-l/4]) rotate ([0,0,30]) m4_nut_cavity(l/2);
}
}
module m4_hole_horiz_with_hex(l) {
union () {
m4_hole_horiz(l);
translate ([0,0,-l/4]) rotate ([0,0,0]) m4_nut_cavity(l/2);
}
}
module rail_clamp () {
translate ([lower_bracket_length/2,0,0]) {
difference () {
// Rail clamp body
box(lower_bracket_length,rail_clamp_height*2,rail_clamp_width);
// Diagonal ramp at start
rotate ([0,45,0]) translate ([-lower_bracket_length/2,0,-2.32*rail_clamp_height])
box(lower_bracket_length,rail_clamp_width*2,rail_clamp_height*2);
// Diagonal side
translate ([-lower_bracket_length/2,-rail_clamp_width,0]) rotate ([0,0,-45])
translate ([0,-rail_clamp_width/2,-rail_clamp_height])
box(lower_bracket_length,rail_clamp_width*2,rail_clamp_height*2);
rotate ([180,0,0]) translate ([-lower_bracket_length/2,-rail_clamp_width,0]) rotate ([0,0,-45])
translate ([0,-rail_clamp_width/2,rail_clamp_height])
box(lower_bracket_length,rail_clamp_width*2,rail_clamp_height*2);
// Crimp in the middle
translate ([6,0,-rail_clamp_height*0.84]) rotate ([0,45,0])
box(rail_clamp_height,lower_bracket_width,rail_clamp_height);
}
}
}
module nema_17() {
union () {
translate ([0,0,nema17_side/2]) box(nema17_side,nema17_side,nema17_side);
cylinder (h=nema17_side*1.5,r=23/2,center=true);
// Flip-out bit needed when building with X vertical
translate ([nema17_side/2,0,0]) rotate ([0,-45,0]) translate ([nema17_side/2,0,nema17_side/2])
box(nema17_side,nema17_side,nema17_side);
// 8mm * M3 clearance slots, 4 of.
rotate ([0,0,45]) translate([19,0,0]) box(8,m3_clearance_rad*2, 60);
rotate ([0,0,-45]) translate([19,0,0]) box(8,m3_clearance_rad*2, 60);
rotate ([0,0,135]) translate([19,0,0]) box(8,m3_clearance_rad*2, 60);
rotate ([0,0,-135]) translate([19,0,0]) box(8,m3_clearance_rad*2, 60);
}
}
module x_motor_bracket_body() {
union () {
translate ([0,0,2])
difference () {
// Solid bits.
union () {
box(lower_bracket_base_height,lower_bracket_width,lower_bracket_base_width*2);
translate ([0,-x_rail_sep/2,-1]) rail_clamp();
translate ([0,x_rail_sep/2,-1]) rail_clamp();
}
// Slivers taken off for passage of belt.
translate ([0,0,-(2*lower_bracket_base_width)])
box(lower_bracket_base_height+0.5,lower_bracket_width+1,lower_bracket_base_width*2);
translate ([lower_bracket_length+1,4+lower_bracket_width/-2,-(2*lower_bracket_base_width)])
box(lower_bracket_length*2,rail_clamp_width*0.4,lower_bracket_base_width*2);
translate ([lower_bracket_length+1,-(4+lower_bracket_width/-2),-(2*lower_bracket_base_width)])
box(lower_bracket_length*2,rail_clamp_width*0.4,lower_bracket_base_width*2);
}
// Notched box along the top of the bracket.
translate ([lower_bracket_length-top_notch_height/2,0,0]) difference () {
box(top_notch_height,lower_bracket_width*0.55,rail_clamp_width*0.8);
translate ([8.5,0,0]) rotate([0,0,45]) cube((x_rail_sep-rail_clamp_width)*0.4,center=true);
}
// "Mouse ears" for fan
translate ([-lower_bracket_base_height/2,0,lower_bracket_base_width+7]) difference () {
union () {
translate ([0,25,0]) rotate ([0,90,0]) cylinder(h=5,r=7);
translate ([0,-25,0]) rotate ([0,90,0]) cylinder(h=5,r=7);
}
translate ([0,25,0]) rotate ([0,90,0]) m4_hole_vert(30);
translate ([0,-25,0]) rotate ([0,90,0]) m4_hole_vert(30);
}
}
}
module x_motor_bracket () {
difference () {
x_motor_bracket_body();
// Outer bearings
translate ([0,(lower_bracket_width-12)/2,4-lower_bracket_base_width]) m4_hole_horiz_with_hex(50);
translate ([0,(lower_bracket_width-12)/-2,4-lower_bracket_base_width]) m4_hole_horiz_with_hex(50);
// Rails
translate ([0,x_rail_sep/2,0]) rotate ([0,90,0]) cylinder(h=200,r=rail_rad,center=true);
translate ([108,(x_rail_sep/2)+12,0]) box(200,40,2);
translate ([0,-x_rail_sep/2,0]) rotate ([0,90,0]) cylinder(h=200,r=rail_rad,center=true);
rotate ([180,0,0]) translate ([108,(x_rail_sep/2)+12,0]) box(200,40,2);
// NEMA17
translate ([lower_bracket_width*0.35,0,5]) nema_17();
rotate ([180,0,0]) translate ([lower_bracket_width*0.35,0,6]) nema_17();
// Holes for rail grips.
translate ([lower_bracket_length*0.35,x_rail_sep/2+m8_tight_rad*2,-5]) m4_hole_horiz_with_hex(60);
translate ([lower_bracket_length*0.85,x_rail_sep/2+m8_tight_rad*2,-5]) m4_hole_horiz_with_hex(60);
translate ([lower_bracket_length*0.35,-(x_rail_sep/2+m8_tight_rad*2),-5]) m4_hole_horiz_with_hex(60);
translate ([lower_bracket_length*0.85,-(x_rail_sep/2+m8_tight_rad*2),-5]) m4_hole_horiz_with_hex(60);
// Notch in the top
translate([lower_bracket_length,0,0]) cylinder(h=30,r=rail_rad,center=true);
}
}
translate ([30,50,0]) rotate ([0,-90,0]) translate([lower_bracket_base_height/2,0,0])
x_motor_bracket();
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