hanger.scad
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include <libs/polyround.scad>
include <libs/uploads_6f_12_f1_10_d2_ISOThread.scad>
// Author: Hubert Berezowski
// Copyright: 2018
// License: GPL 3
TOLLERANCE = 0.15;
T = TOLLERANCE;
THREAD_TOLLERANCE = 0.3 ;
TT = THREAD_TOLLERANCE;
fn=20;
// FRAME PARAMETERS
FRAME_INNER_RADIUS_NEAR_HUB = 10;
FRAME_OUTER_RADIUS_NEAR_HANGER = 10;
// PLATE PARAMETERS
FIX_PLATE_SPAN_X = 56.7;
FIX_PLATE_SPAN_Y = 27;
FIX_PLATE_HEIGHT = 4.8;
FIX_PLATE_EDGE = 1.5;
// HUB GROOVE
HUB_DIAMETER = 8.5;
HUB_OFFSET_X = 14.5 + HUB_DIAMETER / 2;
HUB_OFFSET_Y = 9.3 + HUB_DIAMETER / 2;
HUB_DIAMETER_SPACER = 16;
HUB_DIAMETER_SPACER_HEIGHT = 3;
HUB_DIAMETER_FRAME_SPACER = 20;
HUB_DIAMETER_FRAME_SPACER_HEIGHT = 1.8;
// HANGER PARAMETERS
HANGER_HEIGHT = 8;
HANGER_THREAD_OFFSET = 14.5;
HANGER_THREAD_DIAMETER = 10; // todo
HANGER_SAFETY_WIDTH = 6; // it looks so flimsy
HANGER_WIDTH = HUB_OFFSET_X - HUB_DIAMETER / 2;
HANGER_SPAN = HANGER_THREAD_OFFSET + HANGER_WIDTH / 2;
// FIXING PIN HOLE
FIX_PIN_DIAMETER = 10.3;
FIX_PIN_HEAD_DIAMETER = 12.5;
FIX_PIN_HEAD_RECESS_HEIGHT = 1.5; // HEIGHT OF THE RECESS THAT GRABS THE PIN !!, PINHEAD DISTANCE TO FRAME !!
// semi computed
// SET OFFSET OR BORDER
// OFFSET
/* FIX_OFFSET = 8; // center of fixation pin */
// BORDER
FIX_BORDER = 2.5; // border of plate to fixation pin distance
FIX_OFFSET = FIX_PIN_DIAMETER / 2 + FIX_BORDER; // computed center of fixation pin
// output
difference() {
hanger_wedge_plate();
fixing_pin();
hub_grove();
tensioner_thread();
}
// tensioner thread hole
module tensioner_thread() {
difference() {
translate([HANGER_WIDTH / 2, FIX_PLATE_SPAN_Y + HANGER_THREAD_OFFSET ,-1]){
cylinder(h = 20, d = HANGER_THREAD_DIAMETER + TT, center = false, $fn = fn);
}
translate([HANGER_WIDTH / 2, FIX_PLATE_SPAN_Y + HANGER_THREAD_OFFSET ,-1])
thread_in_pitch(HANGER_THREAD_DIAMETER + TT,HANGER_HEIGHT+3, 1);
}
}
// fixing pin hole
module fixing_pin() {
ankathete = FIX_OFFSET / tan(22.5);
translate([FIX_PLATE_SPAN_X,0,0]){
translate([ -ankathete, FIX_OFFSET, -1 ]){
cylinder(h = 20, d = FIX_PIN_DIAMETER + TT, center = false, $fn = fn);
cylinder(h = FIX_PLATE_HEIGHT - FIX_PIN_HEAD_RECESS_HEIGHT + 1, d = FIX_PIN_HEAD_DIAMETER + TT, center = false, $fn = fn);
}
}
}
// hub groove
module hub_grove() {
union() {
hull() {
translate([ HUB_OFFSET_X, HUB_OFFSET_Y, 0 ]){
cylinder(h = 20, d = HUB_DIAMETER + T, center = true, $fn = fn);
}
translate([ HUB_OFFSET_X, FIX_PLATE_SPAN_Y + T, 0 ]){
cylinder(h = 20, d = HUB_DIAMETER + T, center = true, $fn = fn);
}
}
translate([ HUB_OFFSET_X, HUB_OFFSET_Y, FIX_PLATE_HEIGHT - HUB_DIAMETER_FRAME_SPACER_HEIGHT]){
cylinder(h = HUB_DIAMETER_FRAME_SPACER_HEIGHT + 1, d = HUB_DIAMETER_FRAME_SPACER + TT, center = false, $fn = fn);
}
translate([ HUB_OFFSET_X, HUB_OFFSET_Y, -1]){
cylinder(h = 10, d = HUB_DIAMETER_SPACER + TT, center = false, $fn = fn);
}
translate([ HUB_OFFSET_X, HUB_OFFSET_Y, FIX_PLATE_HEIGHT - ( HUB_DIAMETER_FRAME_SPACER_HEIGHT + HUB_DIAMETER_SPACER_HEIGHT + 10) ]){
cylinder(h = 10, d = 20 + TT, center = false, $fn = fn);
}
}
}
// hanger wedge plate
module hanger_wedge_plate() {
union() { // combine fixation plate with hangerblock
// fix plate
fix_plate_shape = [ [FIX_PLATE_EDGE + T,FIX_PLATE_EDGE + T,FRAME_INNER_RADIUS_NEAR_HUB]
, [FIX_PLATE_SPAN_X - ( FIX_PLATE_EDGE / tan(22.5) + T / tan(22.5) ),FIX_PLATE_EDGE + T,FIX_OFFSET-FIX_PLATE_EDGE]
, [FIX_PLATE_EDGE + T,FIX_PLATE_SPAN_X - ( FIX_PLATE_EDGE / tan(22.5) + T / tan(22.5) ),0]
];
difference() { // cut shape where the bike frame ends
minkowski() {// combine fixation plate with edged corner
linear_extrude( height = FIX_PLATE_HEIGHT - FIX_PLATE_EDGE)
polygon(
polyRound(
fix_plate_shape, fn
));
linear_extrude(height = FIX_PLATE_EDGE, scale=0)
circle(r = FIX_PLATE_EDGE);
}
translate([ 0
, FIX_PLATE_SPAN_Y + T
, -1
])cube(50,50,100);
}
/* FRAME_OUTER_CURVE_NEAR_HANGER */
// hangerblock
hanger_shape = [ [ T, FIX_PLATE_SPAN_Y - FRAME_OUTER_RADIUS_NEAR_HANGER + T, 0]
, [ FRAME_OUTER_RADIUS_NEAR_HANGER - cos(45) * FRAME_OUTER_RADIUS_NEAR_HANGER + T
, FIX_PLATE_SPAN_Y - FRAME_OUTER_RADIUS_NEAR_HANGER + sin(45)*FRAME_OUTER_RADIUS_NEAR_HANGER + T
, 0
]
, [FRAME_OUTER_RADIUS_NEAR_HANGER + T,FIX_PLATE_SPAN_Y + T,0]
, [HANGER_WIDTH - T ,FIX_PLATE_SPAN_Y + T,0]
, [HANGER_WIDTH - T,FIX_PLATE_SPAN_Y + HANGER_SPAN - T, HANGER_WIDTH/2 - T]
, [T,FIX_PLATE_SPAN_Y + HANGER_SPAN - T, HANGER_WIDTH / 2 - T]
];
difference() {
// hanger
linear_extrude( height = HANGER_HEIGHT)
polygon(
polyRound(
hanger_shape, fn
));
// cut out dropout frame corner
translate([FRAME_OUTER_RADIUS_NEAR_HANGER - T * 3 /*better safe than sorry*/ , FIX_PLATE_SPAN_Y - FRAME_OUTER_RADIUS_NEAR_HANGER,0])
cylinder(h = HANGER_HEIGHT + 1, d = HANGER_THREAD_DIAMETER*2 +T, center = false, $fn = fn*2);
}
// safety diameter probabaly unnecessary
if (HANGER_THREAD_DIAMETER + HANGER_SAFETY_WIDTH > HANGER_WIDTH) {
translate([HANGER_WIDTH / 2, FIX_PLATE_SPAN_Y + HANGER_THREAD_OFFSET , 0])
cylinder(h = HANGER_HEIGHT, d = HANGER_THREAD_DIAMETER + HANGER_SAFETY_WIDTH, center = false, $fn = fn);
}
}
}