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//
/*
* OpenSCAD Shapes Library (www.openscad.at)
* Z axis/X axis interface clamp 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
*
* Modified by Vik 21-Mar-2010
* Allow Z drive rod more space to pass.
* Parameterise Z rail to allow 9mm aluminium tube etc.
*/
// Useful constants etc.
generic_clearance=1;
m3_clearance_rad=1.9;
m4_clearance_rad=2.8;
m6_clearance_rad=3.7;
m8_tight_rad=4.65;
m8_clearance_rad=4.9;
x_rail_sep=60.5-8;
lower_bracket_width=84;
lower_bracket_base_width=8;
lower_bracket_base_height=15;
lower_bracket_length=28; // Also max dimension on X axis
// The rail clamps.
rail_clamp_width=20;
rail_clamp_height=15;
rail_rad=m8_tight_rad; // X rail. 3.6 for 1/4" bar, 5.3 for aluminium rod, or m8_tight_rad for 8mm bar
z_rail_rad=m8_clearance_rad; // Usually m8_clearance_rad. Adjust for your Z rail radius
nema17_side=44;
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 m8_hole_horiz(l) {
cylinder(l,m8_clearance_rad,m4_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);
}
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);
}
}
// For nut cavities, "height" is the max distance between two points on the hex.
module m4_nut_cavity(l) {
hexagon(height=8,depth=l);
}
module m8_nut_cavity(l) {
hexagon(height=14,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 ([1-lower_bracket_length/2,0,-1.9*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);
}
}
}
module horizontal_body() {
union () {
translate ([0,0,2])
difference () {
box(lower_bracket_base_height,lower_bracket_width,lower_bracket_base_width*2);
translate ([0,0,2-lower_bracket_base_width])
box(rail_clamp_width*2,lower_bracket_length-20,lower_bracket_base_width*2);
}
translate ([6,-x_rail_sep/2,0]) rail_clamp();
translate ([6,x_rail_sep/2,0]) rail_clamp();
}
}
vbody_length=15;
vbody_width=20;
vbody_height=75;
vbody_slot_width=6;
vbody_slot_depth=15;
vbody_z_drive_cutout=10;
// Holds two sprung sliders for the Z axis.
module vertical_body () {
difference () {
box (vbody_length,vbody_width,vbody_height);
// Slots for Z rail guides
translate ([0,0,(vbody_height-vbody_slot_depth)/2]) {
box(vbody_length*2,vbody_slot_width,vbody_slot_depth+0.1);
translate ([vbody_length/2,0,0]) rotate ([0,0,45]) box(vbody_z_drive_cutout,vbody_z_drive_cutout,vbody_slot_depth+0.1);
translate ([0,vbody_slot_width+1,0]) rotate ([90,0,0]) m4_hole_horiz_with_hex(vbody_width*2);
}
translate ([0,0,(vbody_height-vbody_slot_depth)/-2]) {
box(vbody_length*2,vbody_slot_width,vbody_slot_depth+0.1);
translate ([vbody_length/2,0,0]) rotate ([0,0,45]) box(vbody_z_drive_cutout,vbody_z_drive_cutout,vbody_slot_depth+0.1);
translate ([0,vbody_slot_width+1,0]) rotate ([90,0,0]) m4_hole_horiz_with_hex(vbody_width*2);
}
}
}
nut_trap_len=20;
nut_trap_height=32;
nut_trap_width=x_rail_sep-rail_clamp_width;
nut_spring_clearance=2.5;
// Holds 2x M8 nuts with an anti-backlash spring between them.
module z_nut_trap () {
translate ([nut_trap_len/2-2,0,0]) {
difference () {
// Main body.
box(nut_trap_len,nut_trap_width,nut_trap_height);
// Nut holders
translate ([0,0,nut_trap_height/2-4]) m8_nut_cavity(10);
translate ([0,0,-(nut_trap_height/2-4)]) m8_nut_cavity(10);
// Nice, big hole for threaded Z axis drive rod
cylinder(h=nut_trap_height, r=m8_clearance_rad+0.4, center=true);
// Spring
box(nut_trap_len*1.1,nut_trap_width-2*nut_spring_clearance,nut_spring_clearance);
translate ([0,0,(nut_trap_height/2)-5-nut_spring_clearance])
box(nut_trap_len*1.1,nut_trap_width-2*nut_spring_clearance,nut_spring_clearance);
translate ([0,0,-((nut_trap_height/2)-5-nut_spring_clearance)])
box(nut_trap_len*1.1,nut_trap_width-2*nut_spring_clearance,nut_spring_clearance);
translate ([0,0,((nut_trap_height/2)-5-nut_spring_clearance)/2])
box(nut_trap_len*1.1,nut_trap_width-2*nut_spring_clearance,nut_spring_clearance);
translate ([0,0,((nut_trap_height/2)-5-nut_spring_clearance)/-2])
box(nut_trap_len*1.1,nut_trap_width-2*nut_spring_clearance,nut_spring_clearance);
// Slot parallel to thread axis
translate ([0,0,((nut_trap_height/2)-12-nut_spring_clearance)/-2])
box(nut_trap_width-2*nut_spring_clearance,nut_spring_clearance,nut_trap_len*1.1);
// Diagonal slots.
rotate ([0,0,45]) translate ([-nut_trap_len/2,0,0])
box(nut_trap_width-2*nut_spring_clearance,nut_spring_clearance,nut_trap_len*1.1);
rotate ([0,0,-45]) translate ([-nut_trap_len/2,0,0])
box(nut_trap_width-2*nut_spring_clearance,nut_spring_clearance,nut_trap_len*1.1);
}
// Prop.
translate ([(lower_bracket_base_height+nut_trap_len)/-2+2,0,0])
box(lower_bracket_base_height,nut_trap_width-2,nut_trap_height);
}
}
belt_slot_width=3;
belt_slot_height=3;
module x_z_interface_bracket () {
difference () {
union () {
horizontal_body();
vertical_body();
translate([nut_trap_height-5,-1,0]) box(10,5,nut_trap_height);
translate ([vbody_length/2,0,0]) z_nut_trap();
}
// 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);
// Holes for rail grips.
translate ([lower_bracket_length*0.7,x_rail_sep/2+m8_tight_rad*2-1,-7]) m4_hole_horiz_with_hex(60);
translate ([lower_bracket_length*0.7,-(x_rail_sep/2+m8_tight_rad*2)+1,-7]) m4_hole_horiz_with_hex(60);
// Slots for belt passage
translate ([-lower_bracket_length*2,(x_rail_sep+rail_clamp_width)/2+belt_slot_width+3,-rail_clamp_height/2-2]) // Dunno why 2.
scale (2) box(lower_bracket_length*4,belt_slot_width,belt_slot_height);
translate ([-lower_bracket_length*2,(x_rail_sep+rail_clamp_width)/-2-belt_slot_width-3,-rail_clamp_height/2-2]) // Dunno why 2.
scale (2) box(lower_bracket_length*4,belt_slot_width,belt_slot_height);
// Slot "round the back"
translate ([-rail_clamp_height/2,0,-rail_clamp_width/2-2]) rotate ([0,45,0]) rotate ([0,0,90]) box(lower_bracket_length*5,6,6);
}
}
z_spring_length=6; // That has to fit between the interface bracket and the Z rail
z_spring_width=48;
z_spring_thickness=2.2;
z_spring_end=vbody_width/2-z_spring_thickness+z_spring_length-3;
// Simple V-spring.
vspring_cubic=vbody_width*0.85;
module v_spring () {
difference () {
rotate ([0,0,45]) box(vspring_cubic,vspring_cubic,vbody_slot_depth);
rotate ([0,0,45]) translate ([z_spring_thickness,z_spring_thickness,0]) box(vspring_cubic,vspring_cubic,vbody_slot_depth*2);
rotate ([90,-90,0]) scale(0.9) m8_hole_horiz(z_spring_width);
}
}
// A sprung saddle originally designed to fit an 8mm rod
module z_saddle() {
translate ([0,0,vbody_slot_depth/2]) {
union () {
difference () {
union () {
translate([-1,0,0]) box(vbody_width-1,vbody_slot_width-generic_clearance,vbody_slot_depth);
translate([-vbody_width/2-0.2,0,0]) rotate ([0,0,45])
box(vbody_z_drive_cutout,vbody_z_drive_cutout,vbody_slot_depth);
translate([(vbody_width+z_spring_length)/2+z_spring_thickness,0,0])
box(z_spring_length,z_spring_width,vbody_slot_depth);
translate([(vbody_width+z_spring_length)/-2+z_spring_thickness,0,0])
box(z_spring_thickness,z_spring_width,vbody_slot_depth);
}
// Allow some wiggle-room on the retaining bolt
scale (1.2) rotate ([90,-90,0]) m4_hole_horiz(vbody_slot_width*2);
// Bit that grabs the rail
translate ([vbody_width/2+z_spring_length+z_rail_rad-2.5,0,0])
cylinder(h=vbody_slot_depth*2,r=z_rail_rad,center=true);
// Gap to let Z drive rod pass
translate([-vbody_width/2-z_spring_thickness*2,0,0]) rotate ([0,0,45])
box(vbody_z_drive_cutout,vbody_z_drive_cutout,vbody_slot_depth+0.1);
}
translate ([z_spring_thickness/2,z_spring_width*0.47,0]) v_spring();
translate ([z_spring_thickness/2,-z_spring_width*0.47,0]) rotate ([0,0,180]) v_spring();
}
}
}
translate ([30,50,0]) rotate ([0,-90,0]) translate([lower_bracket_base_height/2,0,0])
x_z_interface_bracket();
translate ([53,5,0]) z_saddle();
translate ([53,95,0]) z_saddle();
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