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Improve linked strap parametrization

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Dejvino 2021-01-17 22:33:57 +01:00
parent 8b61f86eb6
commit 61dbc1e75a
1 changed files with 32 additions and 9 deletions
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41
strap_link.scad
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@ -1,4 +1,5 @@
links_count=14; links_count=6;
include_terminal=true;
//validation=1; //validation=1;
VALIDATE_INTERSECTION=1; VALIDATE_INTERSECTION=1;
@ -12,6 +13,10 @@ include <BOSL/constants.scad>
function get_link_segment_size() = [15, 30, 5]; function get_link_segment_size() = [15, 30, 5];
function get_link_pin_diameter() = 2; function get_link_pin_diameter() = 2;
function get_link_socket_slack() = [1, 4, 1]; function get_link_socket_slack() = [1, 4, 1];
function get_link_joiner_arm_size() = [get_link_segment_size().x - 2, 3, segment_size.z];
function get_link_socket_size() = [get_link_segment_size().z,
get_link_segment_size().y - get_link_joiner_arm_size().y*2,
get_link_segment_size().z];
echo("==============================="); echo("===============================");
echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm")); echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm"));
@ -20,7 +25,7 @@ echo("===============================");
assert(get_link_segment_size().x >= 10, "Link segment is too short."); assert(get_link_segment_size().x >= 10, "Link segment is too short.");
assert(get_link_segment_size().z >= (get_link_pin_diameter() + get_link_socket_slack().z + 1), "Link segment is too thin."); assert(get_link_segment_size().z >= (get_link_pin_diameter() + get_link_socket_slack().z + 1), "Link segment is too thin.");
module link() { module link(terminal=false) {
segment_size=get_link_segment_size(); segment_size=get_link_segment_size();
module pin() { module pin() {
h=segment_size.y; h=segment_size.y;
@ -45,7 +50,7 @@ module link() {
} }
module joiner() { module joiner() {
gap=2; gap=2;
arm_size=[8, 3, segment_size.z]; arm_size=get_link_joiner_arm_size();
module arm() { module arm() {
fwd(segment_size.y/2 + arm_size.y/2 - 1) right(arm_size.x/2 - 1) cuboid(arm_size, fillet=1, edges=EDGES_FRONT + EDGES_Y_ALL); fwd(segment_size.y/2 + arm_size.y/2 - 1) right(arm_size.x/2 - 1) cuboid(arm_size, fillet=1, edges=EDGES_FRONT + EDGES_Y_ALL);
} }
@ -56,11 +61,11 @@ module link() {
scale([1, -1, 1]) arm(); scale([1, -1, 1]) arm();
} }
module armJoiner() { module armJoiner() {
joiner_size=[arm_size.x*0.48, segment_size.y, segment_size.z]; joiner_size=[arm_size.x-get_link_socket_size().x, segment_size.y, segment_size.z];
right(joiner_size.x + 1) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM); right(joiner_size.x/2 + get_link_socket_size().x/2 + gap) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
} }
module socketJoiner() { module socketJoiner() {
joiner_size=[segment_size.x-4, joiner_size=[segment_size.x-get_link_socket_size().x+get_link_socket_size().x*0.2,
segment_size.y-4, segment_size.y-4,
segment_size.z]; segment_size.z];
difference() { difference() {
@ -68,15 +73,32 @@ module link() {
right(segment_size.x) scale([1, 2, 1]) pin_socket_area(); right(segment_size.x) scale([1, 2, 1]) pin_socket_area();
} }
} }
socketJoiner(); module terminalArm() {
left(5) {
shift=arm_size.x - get_link_pin_diameter();
right(segment_size.x + shift + gap/2) pin();
right(segment_size.x + gap/2) {
armFront();
armBack();
}
right(arm_size.x - get_link_socket_size().x + gap) armJoiner();
}
}
armFront(); armFront();
armBack(); armBack();
armJoiner(); armJoiner();
if (terminal) {
terminalArm();
} else {
socketJoiner();
}
} }
pin(); pin();
right(segment_size.x) pin_socket();
joiner(); joiner();
if (!terminal) {
right(segment_size.x) pin_socket();
}
} }
segment_size=get_link_segment_size(); segment_size=get_link_segment_size();
@ -100,7 +122,8 @@ if (!is_undef(validation)) {
} }
} else { } else {
for (i = [0:links_count-1]) { for (i = [0:links_count-1]) {
right(i*segment_size.x) link(); terminal=(i==links_count-1) && include_terminal;
right(i*segment_size.x) link(terminal=terminal);
} }
} }