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gregs-x-carriage.scad
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gregs-x-carriage.scad
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// Gregs PRUSA Mendel
// X-carriage
// Used for sliding on X axis
// GNU GPL v2
// Greg Frost
//https://github.com/GregFrost/PrusaMendel
include <gregs-lm8uu-holder.scad>
holder_separation=18;
fan_hole_separation=32; // check
fan_support_block=11;
fan_trap_width=3;
fan_support_thickness=11;
fan_diameter=36;
fan_hole_height=5.5;
belt_clamp_thickness=2;
belt_clamp_width=m3_diameter+3*belt_clamp_thickness+2;
belt_clamp_hole_separation=10;
belt_clamp_height=m3_diameter+2*belt_clamp_thickness;
belt_clamp_length=belt_clamp_hole_separation+m3_diameter+2*belt_clamp_thickness;
belt_width=6;
belt_thickness=1.5;
tooth_height=1.5;
tooth_spacing=5;
belt_clamp_channel_height=belt_thickness+tooth_height+belt_clamp_thickness*2;
echo ("belt_clamp_width+0.75",belt_clamp_width+0.75);
for (i=[-1,1])
translate([0,i*(belt_clamp_width+0.75),0])
belt_clamp();
belt_clamp_channel();
gregs_x_carriage();
module gregs_x_carriage(with_fanmount=true)
{
difference()
{
union ()
{
if (with_fanmount)
translate([0,-holder_separation-lm8uu_holder_width-fan_support_block/2+3,0])
fan_mount();
linear_extrude(height=lm8uu_support_thickness)
{
barbell (
[25,holder_separation/2],
[25,-holder_separation/2],
lm8uu_holder_width/2,lm8uu_holder_width/2,12,12);
barbell (
[25-lm8uu_holder_width/2,holder_separation/2+lm8uu_holder_length-8],
[-25-13.5+belt_clamp_hole_separation/2,
1*(lm8uu_holder_length/2+belt_clamp_width/2)],
8,belt_clamp_width/2,130,130);
barbell (
[25-lm8uu_holder_width/2,-holder_separation/2-lm8uu_holder_length+8],
[-25-13.5+belt_clamp_hole_separation/2,
-1*(lm8uu_holder_length/2+belt_clamp_width/2)],
8,belt_clamp_width/2,130,130);
polygon(points=[
[-25-lm8uu_holder_width/2,1*(lm8uu_holder_length/2+belt_clamp_width/2)],
[-25-lm8uu_holder_width/2,-1*(lm8uu_holder_length/2+belt_clamp_width/2)],
[25-lm8uu_holder_width/2+8,-holder_separation/2-lm8uu_holder_length+8],
[25-lm8uu_holder_width/2+8,holder_separation/2+lm8uu_holder_length-8]],
paths=[[0,1,2,3]]);
}
difference()
{
cylinder(r=25+m4_diameter,h=6);
translate([25-lm8uu_holder_width/2+lm8uu_support_thickness,
-lm8uu_holder_length,-1])
cube([lm8uu_holder_width,2*lm8uu_holder_length,8]);
translate([-25-lm8uu_holder_width/2,-lm8uu_holder_length/2,-1])
cube([lm8uu_holder_width,lm8uu_holder_length,8]);
}
for (i=[-1,1])
translate([-25-13.5-1,i*(lm8uu_holder_length/2+belt_clamp_width/2)])
rotate(90*(i+1)+180)
belt_clamp_socket ();
}
for (i=[0:1])
rotate(180*i)
for (hole=[-1:1])
rotate(hole*22)
translate([0,25,-1])
cylinder(r=m4_diameter/2,h=lm8uu_support_thickness*2+2,$fs=1);
translate([0,0,-1])
cylinder(r=21,h=lm8uu_support_thickness*2+2);
for (i=[-1,1])
translate([-25-13.5-1,i*(lm8uu_holder_length/2+belt_clamp_width/2)])
rotate(90*(i+1)+180)
belt_clamp_holes();
// Cable tie holes.
for (i=[-1,1])
translate([25-lm8uu_holder_width/2,
(holder_separation/2+lm8uu_holder_length*0.7)*i,5])
rotate([0,-30,0])
cube([2,4,20],center=true);
cable_tie_holes();
}
difference ()
{
union ()
{
for(i=[-1,1])
{
translate([50/2-lm8uu_holder_width/2,
i*(lm8uu_holder_length+holder_separation)/2-
lm8uu_holder_length/2,0])
render()
lm8uu_bearing_holder();
}
translate([-50/2-lm8uu_holder_width/2,-lm8uu_holder_length/2,0])
render()
lm8uu_bearing_holder();
}
cable_tie_holes();
}
}
module cable_tie_holes ()
{
// Cable tie holes.
for (i=[-1,1])
translate([25-lm8uu_holder_width/2,(holder_separation/2+lm8uu_holder_length*0.7)*i,5])
rotate([0,-30,0])
cube([2,4,20],center=true);
for (i=[-1,1])
{
translate([-25+lm8uu_holder_width/2,6.5*i,5])
rotate([0,30,0])
translate([2,0,0])
cube([6,4,20],center=true);
}
}
module belt_clamp_socket()
{
difference()
{
translate([0,0,belt_clamp_height/2])
union()
{
cube([belt_clamp_hole_separation,belt_clamp_width,belt_clamp_height],
center=true);
for(i=[-1,1])
translate([i*belt_clamp_hole_separation/2,0,0])
cylinder(r=belt_clamp_width/2,h=belt_clamp_height,center=true);
}
belt_clamp_holes();
}
}
module belt_clamp_channel()
{
difference()
{
translate([0,0,belt_clamp_channel_height/2])
union()
{
cube([belt_clamp_hole_separation,
belt_clamp_width,belt_clamp_channel_height],center=true);
for(i=[-1,1])
translate([i*belt_clamp_hole_separation/2,0,0])
cylinder(r=belt_clamp_width/2,h=belt_clamp_channel_height,center=true);
}
for(i=[-1,1])
translate([i*belt_clamp_hole_separation/2,0,-1])
rotate(360/16)
cylinder(r=m3_diameter/2,h=belt_clamp_channel_height+2,$fn=8);
translate([-belt_width/2,-belt_clamp_width/2-1,
belt_clamp_channel_height-belt_thickness-tooth_height])
cube([belt_width,belt_clamp_width+2,belt_thickness+tooth_height+1]);
}
}
module belt_clamp_holes()
{
translate([0,0,belt_clamp_height/2])
{
for(i=[-1,1])
translate([i*belt_clamp_hole_separation/2,0,0])
cylinder(r=m3_diameter/2,h=belt_clamp_height+2,center=true,$fn=8);
rotate([90,0,0])
rotate(360/16)
cylinder(r=m3_diameter/2-0.3 /*tight*/ ,h=belt_clamp_width+2,center=true,$fn=8);
rotate([90,0,0])
translate([0,0,belt_clamp_width/2])
cylinder(r=m3_nut_diameter/2-0.3 /*tight*/ ,h=3.4,center=true,$fn=6);
}
}
belt_clamp_clamp_height=tooth_height+belt_clamp_thickness*2;
module belt_clamp()
{
difference()
{
translate([0,0,belt_clamp_clamp_height/2])
union()
{
cube([belt_clamp_hole_separation,belt_clamp_width,
belt_clamp_clamp_height],center=true);
for(i=[-1,1])
translate([i*belt_clamp_hole_separation/2,0,0])
cylinder(r=belt_clamp_width/2,h=belt_clamp_clamp_height,center=true);
}
for(i=[-1,1])
translate([i*belt_clamp_hole_separation/2,0,-1])
rotate(360/16)
cylinder(r=m3_diameter/2,h=belt_clamp_clamp_height+2,$fn=8);
for(i=[-1:1])
translate([-belt_width/2,-tooth_spacing/4+i*tooth_spacing,
belt_clamp_clamp_height-tooth_height])
cube([belt_width,tooth_spacing/2,tooth_height+1]);
}
}
module barbell (x1,x2,r1,r2,r3,r4)
{
x3=triangulate (x1,x2,r1+r3,r2+r3);
x4=triangulate (x2,x1,r2+r4,r1+r4);
render()
difference ()
{
union()
{
translate(x1)
circle (r=r1);
translate(x2)
circle(r=r2);
polygon (points=[x1,x3,x2,x4]);
}
translate(x3)
circle(r=r3,$fa=5);
translate(x4)
circle(r=r4,$fa=5);
}
}
fan_hole_separation=32; // check
fan_support_block=11;
fan_trap_width=3;
fan_support_thickness=11;
fan_diameter=36;
fan_hole_height=5.5;
module fan_mount()
{
difference()
{
union ()
{
translate([0,0,fan_support_block/4])
cube([fan_hole_separation+fan_support_block,fan_support_thickness,
fan_support_block/2],center=true);
for (i=[-1,1])
translate([i*fan_hole_separation/2,0,fan_support_block/2])
rotate([90,0,0])
cylinder(r=fan_support_block/2,h=fan_support_block,center=true,$fn=20);
translate([0,0,fan_support_block/2])
cube([fan_hole_separation,fan_support_thickness,fan_support_block],
center=true);
translate([0,6,lm8uu_support_thickness/2])
cube([fan_hole_separation+fan_support_block,fan_support_thickness+12,
lm8uu_support_thickness],center=true);
}
for(i=[-1,1])
{
translate([i*fan_hole_separation/2,0,fan_hole_height])
{
rotate([90,0,0])
rotate(180/8)
cylinder(r=m3_diameter/2,h=fan_support_thickness+2,
center=true,$fn=8);
translate([0,0,0])
rotate([90,0,0])
rotate([0,0,180/6])
cylinder(r=(m3_nut_diameter-0.5)/2,h=fan_trap_width,
center=true,$fn=6);
color([1,0,0])
translate([0,0,-(fan_hole_height+1)/2])
cube([(m3_nut_diameter-0.5)*cos(30),fan_trap_width,
fan_hole_height+1],center=true);
}
}
translate([0,0,fan_hole_separation/2+fan_hole_height])
rotate([-90,0,0])
cylinder(r=fan_diameter/2,h=fan_support_thickness+2,center=true);
}
}
function triangulate (point1, point2, length1, length2) =
point1 +
length1*rotated(
atan2(point2[1]-point1[1],point2[0]-point1[0])+
angle(distance(point1,point2),length1,length2));
function distance(point1,point2)=
sqrt((point1[0]-point2[0])*(point1[0]-point2[0])+
(point1[1]-point2[1])*(point1[1]-point2[1]));
function angle(a,b,c) = acos((a*a+b*b-c*c)/(2*a*b));
function rotated(a)=[cos(a),sin(a),0];