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Belt_tension_meter.scad
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Belt_tension_meter.scad
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/*[Pegs]*/
peg_diameter = 8;
peg_resolution = 12;
peg_distance = 45;
peg_overlap = 50;
belt_width = 8;
/*[Case]*/
base_height = 4;
max_overhang_angle = 45;
tolerance = 0.2;
nozzle_diameter = 0.4;
layer_height = 0.2;
border_width = 5;
/*[Spring]*/
amplitude = 7.5;
// 1 pulse is half a wavelength
pulse_length = 5;
number_of_pulses = 2;
spring_perimeters = 2;
spring_connection_length = 5;
/*[Vernier]*/
rule_margin = 2;
rule_spacing = 1;
type = "standart";
number_of_subdivisions = 10;
_height = belt_width + base_height + layer_height;
_vernier_length = (2 * number_of_subdivisions - 1) * rule_spacing;
//bottom cylinder
module peg(x=0, y=0, z=0, rot = 0) {
translate([x, y, z])
rotate([0, 0, rot])
cylinder(_height, d = peg_diameter, $fn=peg_resolution);
}
//middle cylinder bridge
module bridge() {
translate([0.01 * (100 - peg_overlap) * peg_diameter, 0, base_height + layer_height])
hull() {
rotate([0, 0, 180])
cylinder(belt_width, d = peg_diameter, $fn=peg_resolution);
translate([0.01 * (150 + peg_overlap) * peg_diameter, 0, 0])
rotate([0, 0, 180])
cylinder(belt_width, d = peg_diameter, $fn=peg_resolution);
}
}
//spring guide
module slider(x, y, z, angle) {
a = y;
w = 0.5 * z / tan(angle);
rotate([0, 90, 0])
linear_extrude(x)
polygon([[0, a], [-0.5 * z, a+w], [-z, a], [-z, -a], [-0.5 * z, -a - w], [0, -a]]);
}
//vernier scale
module vernier_scale() {
translate([2.5 * peg_diameter + rule_margin, 1.5 * amplitude - 5, _height])
for (i = [0 : 1 : 10]){
translate([i * _vernier_length / number_of_subdivisions, 0, 0])
cube([nozzle_diameter, 5, layer_height]);
}
}
//case
/*
translate([2.5 * peg_diameter - border_width - tolerance, 0, 0])
difference() {
translate([0, -a - tolerance - border_width, 0])
cube([_vernier_length + 2 * (rule_margin + border_width + spring_connection_length) + nozzle_diameter + pulse_length * number_of_pulses + tolerance, 2 * (a + tolerance + border_width), _height]);
translate([border_width, 0, base_height + layer_height])
rotate([0, 90, 0])
linear_extrude(_vernier_length + 2 * (rule_margin + spring_connection_length) + nozzle_diameter + pulse_length * number_of_pulses)
polygon([
[layer_height, a + tolerance],
[-0.5 * belt_width, a+w+tolerance],
[-belt_width - layer_height, a+tolerance],
[-belt_width - layer_height, -a-tolerance],
[-0.5 * belt_width, -a - w-tolerance],
[layer_height, -a-tolerance]
]);
}*/
module chamfer_object(r, fn=4) {
translate([r, 0, r])
union() {
cylinder(r, r, 0, $fn=fn);
translate([0, 0, -r])
cylinder(r, 0, r, $fn=fn);
}
}
module case_a(chamfer_radius) {
x = _vernier_length + 2 * (rule_margin + border_width + spring_connection_length - chamfer_radius) + nozzle_diameter + pulse_length * number_of_pulses + tolerance;
y = 2 * (tolerance + border_width - chamfer_radius) + 3 * amplitude;
z = _height - 2 * chamfer_radius;
hull() {
for (i = [0 : 1 : 1],
j = [0 : 1 : 1],
k = [0 : 1 : 1]) {
translate([i * x, (j - 0.5) * y, k * z])
chamfer_object(chamfer_radius, 20);
}
}
}
module case_w_guide() {
difference() {
children();
translate([border_width, 0, base_height + layer_height - tolerance])
slider(_vernier_length + 2 * (rule_margin + spring_connection_length) + nozzle_diameter + pulse_length * number_of_pulses, //x
1.5 * amplitude + tolerance, //y
belt_width + 2 * tolerance, //z
max_overhang_angle //angle
);
}
}
module case(){
case_w_guide(){
case_a(2);
}
}
module belt_tension_meter(){
union() {
// top peg
peg(y = 0.5 * peg_distance);
// middle peg
peg(x = 0.01 * (100 - peg_overlap) * peg_diameter, rot = 180);
// bottom cylinder
peg(y = -0.5 * peg_distance);
// bridge
bridge();
translate([2.5 * peg_diameter, 0, base_height + layer_height])
slider(_vernier_length + 2 * rule_margin + nozzle_diameter, //x
1.5 * amplitude, //y
belt_width, //z
max_overhang_angle //angle
);
vernier_scale();
translate([2.5 * peg_diameter - border_width - tolerance, 0, 0])
case();
}
}
belt_tension_meter();