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Added pulleys on Y sliders

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This commit is contained in:
TQ Hirsch
2022-03-03 09:53:56 +01:00
parent 11116136f2
commit a7119fd012
3 changed files with 107 additions and 16 deletions
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2
assembly.scad
View File

@@ -67,7 +67,7 @@ module moving_parts(xpos = cur_xpos, ypos = cur_ypos) {
ysled_slider(spread = sled_ysize);
translate([xsize - yrail_offset, cur_ypos, 0])
rotate([0, 180, 0])
rotate([180, 180, 0])
ysled_slider(spread = sled_ysize);
translate([yrail_offset, cur_ypos, 0])

84
parts.scad
View File

@@ -13,14 +13,18 @@ corner_size=30;
corner_offset = frame_size / 2 + wall_thickness;
rail_diam = 8;
// distance between centerline of rail and centerline of frame Y tube.
yrail_offset = (frame_size + corner_size / 2) / 2;
yrail_offset = (frame_size + corner_size) / 2;
ysled_extralen = frame_size; // on each end
// Both of these are distance from frame centerline
belt_height1 = frame_size / 2 + wall_thickness + belt_width / 2 + 2;
belt_height2 = belt_height1 + belt_width + 2;
// calculated
ysled_rail_spacing = (sled_ysize);
motor_shaft_xoffset = (corner_size - wall_thickness) / 2;
@@ -83,11 +87,12 @@ module rail_holder(in_x) {
}
}
// centered on
// centered on the rail.
module ysled_slider(spread, associated_parts = $preview) {
bom_item(label = str("ysled_slider(", spread, ")"));
sled_len = spread + frame_size;
sled_height = frame_size;
idler_spacing = spread / 3;
colorize("green")
render()
@@ -95,8 +100,11 @@ module ysled_slider(spread, associated_parts = $preview) {
rotate([-90, 0, 0]) {
difference() {
union() {
translate([-frame_size/2, -frame_size/2, 0])
cube([frame_size + 5, frame_size, sled_len]);
translate([-frame_size/2, -frame_size/2, 0])
cube([frame_size + 5, frame_size, sled_len]);
translate([pulley_sbend_offset - yrail_offset + motor_shaft_xoffset - pulley_clearance_rad - 4,
-frame_size / 2, 0])
cube([frame_size + 5, frame_size, sled_len]);
}
cylinder(d = bushing_id * 1.1, h = sled_len);
@@ -116,6 +124,23 @@ module ysled_slider(spread, associated_parts = $preview) {
}
// TODO: add posts for the idlers
//color("#f00")
translate([pulley_sbend_offset - yrail_offset + motor_shaft_xoffset, 0, 0]) {
translate([0, idler_spacing / 2, 0]) {
idler_post(belt_height = belt_height1);
}
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);
}
}
}
translate([0, -sled_len/2, 0])
rotate([-90, 0, 0])
if (associated_parts) {
@@ -153,6 +178,43 @@ module nema17_housing() {
}
}
// belt height is the center of the belt.
// Roration is in Z axis, from +x/+y
module idler_post(belt_height, toothed=true) {
gap=0.5;
post_radius = pulley_clearance_rad + 4;
top_shelf_thickness = 4;
total_height = idler_zmargin.y + belt_height + top_shelf_thickness + gap;
slot_radius = pulley_clearance_rad;
slot_height = idler_zmargin.x + idler_zmargin.y + gap * 2;
difference() {
union() {
// outer shell
cylinder(h = total_height, r = post_radius);
translate([0, -post_radius, 0])
cube([post_radius, post_radius, total_height]);
translate([-post_radius,0, 0])
cube([post_radius, post_radius, total_height]);
}
translate([0,0,belt_height - idler_zmargin.x - gap]) {
cylinder(r = slot_radius, slot_height);
translate([-slot_radius, 0, 0])
cube([post_radius*2, post_radius * 2, slot_height]);
translate([0, -slot_radius, 0])
cube([post_radius * 2, post_radius * 2, slot_height]);
}
cylinder(d = 3, h=total_height + 1, $fn=60);
translate([0, 0, total_height - 2])
cylinder(r = 3, h = 3);
}
idler(height = belt_height);
}
module flcorner() {
bom_item();
rotate([0, 0, 0]) {
@@ -167,8 +229,8 @@ module flcorner() {
-nema17_face/2 - frame_size/2 - wall_thickness,
frame_size/2]) {
nema17();
translate([0, 0, 2]) {
pulley(16,6,1,7);
translate([0, 0, -frame_size/2 + belt_height2]) {
active_pulley();
}
}
@@ -188,8 +250,9 @@ module frcorner() {
-nema17_face/2 - frame_size/2 - wall_thickness,
frame_size/2]) {
nema17();
translate([0,0,2]) {
pulley(16, 1, 6, 7);
translate([0,0,belt_height1 - frame_size / 2]) {
rotate([180,0,0])
active_pulley();
}
}
}
@@ -393,6 +456,9 @@ module xsled2() {
}
}
// render()
// xsled2();

37
stock_parts.scad
View File

@@ -60,10 +60,15 @@ module nema17(depth = 23.5) {
// belts and pulleys
belt_pitch = 2; // 2mm tooth width for GT2 = 2mm pitch
belt_width = 6;
belt_thickness = 3;
tooth_height = 2;
belt_thickness = 1.38;
belt_pld = 0.254; // distance between line of fixed length and tips of gear teeth
belt_backing = 0.63 - belt_pld;
tooth_height = 0.75;
module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
pulley_od = 13;
pulley_clearance_rad = pulley_od / 2 + 2.5;
module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true, od = 0) {
bom_item(printable=false, label=str(
toothed ? "pulley(" : "idler(",
"teeth=", teeth, ", ",
@@ -73,10 +78,12 @@ module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
"shaft=", shaft, "mm",
")"
));
inner_rad = belt_pitch * teeth / TAU;
outer_rad = inner_rad + belt_thickness;
nominal_rad = belt_pitch * teeth / TAU;
inner_rad = nominal_rad - belt_pld;
outer_rad = (od > 0) ? od / 2 : nominal_rad + belt_backing;
minor_rad = inner_rad - tooth_height;
mid_rad = inner_rad - tooth_height / 2;
idler_rad = nominal_rad - belt_backing;
dtheta = 180 / teeth;
@@ -105,7 +112,7 @@ module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
linear_extrude(belt_width)
polygon(tooth_points, convexity = teeth * 2 + 4);
} else {
cylinder(r = minor_rad, h = belt_width);
cylinder(r = idler_rad, h = belt_width);
}
translate([0,0,lrim + belt_width])
@@ -117,4 +124,22 @@ module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
}
}
idler_zmargin = [ 6.4 / 2 + 1.05, 6.4 / 2 + 1.05 ];
module idler(height=0, toothed=false) {
// pulley(20, 1.05, 1.05, 6.4, toothed=toothed, od=18);
translate([0,0, height-idler_zmargin[0]])
pulley(16, 1.05, 1.05, 6.4, shaft=3, toothed=toothed, od=13);
}
active_pulley_zmargin = [ 9.5, 4.5 ];
module active_pulley(height=0) {
translate([0,0,-active_pulley_zmargin[0] + height])
pulley(16,6,1,7, od=13);
}
// required distance between centers of pulley and idler for an S-bend with right angles.
pulley_sbend_offset = (9.5 + 9.7) / 2 + 0.63;
//!pulley(12, 6, 2, toothed=false);