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Refactored corners to position motor based on motor_shaft_xoffset; changed rail holder to use a rectangular block, added slots for belt tension adjustment

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TQ Hirsch
2022-03-04 20:46:55 +01:00
parent c586e71941
commit ee2beae3c1
4 changed files with 121 additions and 47 deletions
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8
assembly.scad
View File

@@ -57,7 +57,7 @@ module moving_parts(xpos = cur_xpos, ypos = cur_ypos) {
translate([ yrail_offset, cur_ypos, 0 ]) ysled_slider(spread = sled_ysize);
translate([ xsize - yrail_offset, cur_ypos, 0 ]) rotate([ 180, 180, 0 ])
ysled_slider(spread = sled_ysize);
ysled_slider(spread = sled_ysize, is_left = false);
translate([ yrail_offset, cur_ypos, 0 ]) if ($preview) ysled_rails();
@@ -75,3 +75,9 @@ union() {
corners();
moving_parts();
}
*intersection() {
ysled_slider(spread=sled_ysize);
translate([0, -1000, -1000])
cube([2000, 2000, 2000]);
}

9
lib.scad
View File

@@ -2,4 +2,13 @@ module bom_item(printable = true, label = "") {
print_label = printable ? " print " : " stock ";
item_label = label == "" ? parent_module(1) : label;
echo(str("BOM:", print_label, item_label));
}
module slotify(vector) {
for (child = [0:$children-1]) {
hull() {
children(child);
translate(vector) children(child);
}
}
}

147
parts.scad
View File

@@ -25,6 +25,8 @@ belt_height2 = belt_height1 + belt_width + 2;
ysled_rail_spacing = (sled_ysize);
motor_shaft_xoffset = (corner_size - wall_thickness) / 2;
motor_mount_length_adjustment = 4;
motor_mount_length = nema17_face + wall_thickness + motor_mount_length_adjustment;
// Generates bar of length $l, centered on origin extending in +Z
module tslot(l) {
@@ -39,8 +41,10 @@ module tslot(l) {
module corner_base() {
odim = frame_size / 2 + wall_thickness;
ldim = frame_size / 2 + corner_size;
cap_points = [
[ -odim, -odim ], [ -odim, ldim ], [ odim, ldim ], [ ldim, odim ],
[ -odim, -odim ], [ -odim, ldim ], [ odim, ldim ],
[odim, odim], [ ldim, odim ],
[ ldim, -odim ]
];
difference() {
@@ -65,17 +69,18 @@ module rail_holder(in_x) {
tube_offset = (corner_size) / 2 + wall_thickness;
tube_rotation = in_x ? 90 : 0;
translated_rail_offset = yrail_offset - frame_size / 2;
translated_rail_offset = yrail_offset - frame_size / 2 - wall_thickness;
translate([ frame_size / 2, frame_size / 2, -frame_size / 2 ]) {
translate([ frame_size / 2 + wall_thickness, frame_size / 2 + wall_thickness, -frame_size / 2 - wall_thickness ]) {
difference() {
linear_extrude(frame_size)
polygon(points = [[wall_thickness, wall_thickness],
[wall_thickness, corner_size],
[corner_size, wall_thickness]]);
cube([
!in_x ? corner_size - wall_thickness : 10,
!in_x ? 10 : corner_size - wall_thickness,
wall_thickness * 2 + frame_size
]);
translate(
[ translated_rail_offset, translated_rail_offset, frame_size / 2 ])
[ translated_rail_offset, translated_rail_offset, frame_size / 2 + wall_thickness ])
rotate([ tube_rotation - 90, tube_rotation, 0 ])
translate([ 0, 0, -corner_size ])
cylinder(d = rail_diam, corner_size * 4);
@@ -84,7 +89,7 @@ module rail_holder(in_x) {
}
// centered on the rail.
module ysled_slider(spread, associated_parts = $preview) {
module ysled_slider(spread, associated_parts = $preview, is_left=true) {
bom_item(label = str("ysled_slider(", spread, ")"));
sled_len = spread + frame_size;
sled_height = frame_size;
@@ -122,12 +127,12 @@ module ysled_slider(spread, associated_parts = $preview) {
translate(
[ pulley_sbend_offset - yrail_offset + motor_shaft_xoffset, 0, 0 ]) {
translate([ 0, idler_spacing / 2, 0 ]) {
idler_post(belt_height = belt_height1);
idler_post(belt_height = belt_height1, toothed = is_left);
}
translate([ 0, -idler_spacing / 2, 0 ]) {
*cylinder(d = 3, h = 30, $fs = 1);
*idler(belt_height2);
rotate([ 0, 0, -90 ]) { idler_post(belt_height = belt_height2); }
rotate([ 0, 0, -90 ]) { idler_post(belt_height = belt_height2, toothed = !is_left); }
}
}
@@ -138,25 +143,38 @@ module ysled_slider(spread, associated_parts = $preview) {
}
}
module nema17_housing() {
hwidth = corner_size + frame_size + wall_thickness;
hheight = nema17_face + wall_thickness * 2;
hdepth = frame_size + wall_thickness * 2;
screw_dxy = 31 / 2;
translate([ 0, -nema17_face / 2 - frame_size / 2 - wall_thickness, 0 ])
render() difference() {
cube([ hwidth, hheight, hdepth ], center = true);
slotify([0, -motor_mount_length_adjustment, 0]) {
translate([ 0, 0, -2 ])
cube([ nema17_face + 1, nema17_face + 1, hdepth ], center = true);
cylinder(d = 23, frame_size);
for (x = [ -screw_dxy, screw_dxy ], y = [ -screw_dxy, screw_dxy ])
translate([ x, y, frame_size / 2 + wall_thickness ])
rotate([ 180, 0, 0 ]) {
cylinder(d = 5, h = 3);
}
translate([ -screw_dxy, -screw_dxy, frame_size / 2 + wall_thickness ])
rotate([ 180, 0, 0 ]) {
cylinder(d = 5, h = 3);
}
translate([ screw_dxy, -screw_dxy, frame_size / 2 + wall_thickness ])
rotate([ 180, 0, 0 ]) {
cylinder(d = 5, h = 3);
}
translate([ -screw_dxy, screw_dxy, frame_size / 2 + wall_thickness ])
rotate([ 180, 0, 0 ]) {
cylinder(d = 5, h = 3);
}
translate([ screw_dxy, screw_dxy, frame_size / 2 + wall_thickness ])
rotate([ 180, 0, 0 ]) {
cylinder(d = 5, h = 3);
}
}
}
@@ -192,21 +210,36 @@ module idler_post(belt_height, toothed = true) {
cylinder(d = 3, h = total_height + 1, $fn = 60);
translate([ 0, 0, total_height - 2 ]) cylinder(r = 3, h = 3);
}
idler(height = belt_height);
idler(height = belt_height, toothed=toothed);
}
module flcorner() {
bom_item();
rotate([ 0, 0, 0 ]) {
corner_base();
rail_holder(false);
}
translate([ (corner_size - wall_thickness) / 2, 0, 0 ]) nema17_housing();
render() {
rotate([ 0, 0, 0 ]) {
corner_base();
rail_holder(false);
}
difference() {
translate([
-frame_size/2 - wall_thickness,
-frame_size/2 - wall_thickness - motor_mount_length,
-frame_size/2 - wall_thickness
])
cube([
frame_size + wall_thickness + corner_size,
motor_mount_length,
frame_size + wall_thickness * 2
]);
translate([ motor_shaft_xoffset, 0, 0 ]) nema17_housing();
}
// translate([motor_shaft_xoffset, 0, 0 ]) nema17_housing();
}
if ($preview)
translate([
(corner_size - wall_thickness) / 2,
motor_shaft_xoffset,
-nema17_face / 2 - frame_size / 2 - wall_thickness, frame_size / 2
]) {
nema17();
@@ -216,15 +249,29 @@ module flcorner() {
module frcorner() {
bom_item();
rotate([ 0, 0, 90 ]) {
corner_base();
rail_holder(true);
}
translate([ -(corner_size - wall_thickness) / 2, 0, 0 ]) nema17_housing();
render() {
rotate([ 0, 0, 90 ]) {
corner_base();
rail_holder(true);
}
difference() {
translate([
-frame_size/2 - corner_size,
-frame_size/2 - wall_thickness - motor_mount_length,
-frame_size/2 - wall_thickness
])
cube([
frame_size + wall_thickness + corner_size,
motor_mount_length,
frame_size + wall_thickness * 2
]);
translate([ -motor_shaft_xoffset, 0, 0 ]) nema17_housing();
}
}
if ($preview)
translate([
-(corner_size - wall_thickness) / 2,
-motor_shaft_xoffset,
-nema17_face / 2 - frame_size / 2 - wall_thickness, frame_size / 2
]) {
nema17();
@@ -236,6 +283,7 @@ module frcorner() {
module blcorner() {
bom_item();
render()
rotate([ 0, 0, 270 ]) {
corner_base();
rail_holder(true);
@@ -244,6 +292,7 @@ module blcorner() {
module brcorner() {
bom_item();
render()
rotate([ 0, 0, 180 ]) {
corner_base();
rail_holder(false);
@@ -325,11 +374,11 @@ module xsled2() {
inner_ysize = sled_ysize - tab_thickness;
lip_depth = tab_thickness - wall_thickness - glass_thickness;
lip_width = glass_thickness;
film_height = belt_height2 + belt_width / 2;
ledge_width = 15;
inside_ledge_width = ledge_width - 8;
inside_ledge_width = 8;
outside_ledge_width = ledge_width - inside_ledge_width;
film_thickness = 0.25;
@@ -341,13 +390,13 @@ module xsled2() {
[0, film_height + glass_thickness],
[wall_thickness, film_height + glass_thickness],
[wall_thickness, film_height],
[inside_ledge_width, film_height],
[inside_ledge_width, film_height - glass_thickness + 0.5, ],
[ledge_width, film_height - glass_thickness + 0.5],
[outside_ledge_width, film_height],
[outside_ledge_width, film_height - glass_thickness],
[ledge_width, film_height - glass_thickness],
[wall_thickness * 2, -tab_thickness / 2]
];
echo("Ledge width: ", ledge_width - inside_ledge_width);
echo("Ledge width: ", ledge_width - outside_ledge_width);
for (xsign = [ 1, -1 ], ysign = [ 1, -1 ]) {
translate([ sled_xsize / 2 * xsign, sled_ysize / 2 * ysign, 0 ])
rotate([ 0, -90 * xsign, 0 ]) {
@@ -388,6 +437,16 @@ module xsled2() {
linear_extrude(inner_ysize) polygon(glass_holder_points);
}
for (x = [ -1, 1],
y = [ -1, 1]) {
translate([x * (sled_xsize/2 - outside_ledge_width - inside_ledge_width / 2),
y * (inner_ysize/2 - outside_ledge_width - inside_ledge_width / 2),
film_height])
rotate([180,0,0]) {
cylinder(d=4, h = 50);
cylinder(d=5, h = 4 + glass_thickness );
}
}
translate([
-10, -inner_ysize / 2,
@@ -403,8 +462,8 @@ module xsled2() {
[ 0, 0, film_height - glass_thickness / 2 + 0.5 ])
cube(
[
sled_xsize - inside_ledge_width * 2,
inner_ysize - inside_ledge_width * 2,
sled_xsize - outside_ledge_width * 2,
inner_ysize - outside_ledge_width * 2,
glass_thickness
],
center = true);
@@ -427,4 +486,4 @@ module xsled2() {
}
// render()
// xsled2();
// xsled2();

4
stock_parts.scad
View File

@@ -1,7 +1,7 @@
include <MCAD/math.scad>
include <lib.scad>
stock_color = "#aaa4";
stock_color = "#aaa";
bushing_od = 15;
bushing_id = 8;
@@ -59,7 +59,7 @@ belt_backing = 0.63 - belt_pld;
tooth_height = 0.75;
pulley_od = 13;
pulley_clearance_rad = pulley_od / 2 + 2.5;
pulley_clearance_rad = pulley_od / 2 + 1.5;
module pulley(teeth, lrim, urim, belt_width, shaft = 5, toothed = true,
od = 0) {