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disc-grabber.scad
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disc-grabber.scad
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disc_diameter = 210; //mm
arm_thickness = 8; //mm
arm_length = disc_diameter*2/3; //mm
arm_tooth_length = 20; //mm
arm_tooth_grip = 5; //mm
arm_back_stop = 1.5*arm_thickness; //mm
arm_latch = 1; //mm
thumb_tooth_length = arm_tooth_length; //mm
thumb_length = disc_diameter*1/3 + arm_thickness; //mm
thumb_tooth_grip = arm_tooth_grip; //mm
thumb_string_hole_diameter = 5; //mm
screw_diameter=3.0; //mm
screw_tolerance=0.5; //mm
attach_hole_diameter = 6.5; //mm
center_height = arm_thickness;
center_width = 5 * attach_hole_diameter;
center_length = 4 * arm_thickness;
center_tab_thickness = 4; //mm
center_tab_height = thumb_tooth_length;
center_tab_angle = -15; // degrees
rounding=2; //mm
hinge_tolerance = 0.5;
$fn=60;
module thumb() {
difference() {
linear_extrude(height=arm_thickness, center=true) {
minkowski() {
polygon(points=[[rounding, rounding],
[rounding, arm_thickness-rounding],
[thumb_length-arm_thickness+rounding,
arm_thickness-rounding],
[thumb_length-arm_thickness+rounding,
arm_thickness+thumb_tooth_length-arm_thickness+rounding],
[thumb_length-arm_thickness-thumb_tooth_grip+rounding,
arm_thickness+thumb_tooth_length-rounding],
[thumb_length-rounding,
arm_thickness+thumb_tooth_length-rounding],
[thumb_length-rounding,
rounding],
[2*arm_thickness-rounding,
rounding],
[arm_thickness-rounding,
-thumb_tooth_length/2],
[arm_thickness + thumb_string_hole_diameter-rounding,
-thumb_tooth_length+rounding],
[rounding,
-thumb_tooth_length+rounding],
[rounding,
rounding]
]);
circle(r=rounding);
}
}
translate([arm_thickness/2, arm_thickness/2, 0]) {
cylinder(d=screw_diameter + screw_tolerance, h=arm_thickness + 0.1, center=true);
}
translate([rounding+thumb_string_hole_diameter/2,
-thumb_tooth_length+thumb_string_hole_diameter,
0]) {
cylinder(d=thumb_string_hole_diameter, h=arm_thickness + 0.1, center=true);
}
}
}
module arm() {
difference() {
linear_extrude(height=arm_thickness, center=true) {
minkowski() {
polygon(points=[[rounding,
rounding-arm_latch],
[rounding,
arm_thickness-rounding],
[arm_length+arm_back_stop-arm_thickness+rounding,
arm_thickness-rounding],
[arm_length+arm_back_stop-arm_thickness+rounding,
arm_thickness+arm_tooth_length-arm_thickness+rounding],
[arm_length+arm_back_stop-arm_thickness-arm_tooth_grip+rounding,
arm_thickness+arm_tooth_length-rounding],
[arm_length+arm_back_stop-rounding,
arm_thickness+arm_tooth_length-rounding],
[arm_length+arm_back_stop-rounding,
rounding],
[rounding+arm_latch,
rounding]
]);
circle(r=rounding);
}
}
translate([arm_thickness/2+arm_back_stop, arm_thickness/2, 0]) {
rotate([90,0,0]) {
cylinder(d=screw_diameter+screw_tolerance, h=arm_thickness + 0.1, center=true);
}
}
}
}
module center() {
difference() {
union() {
linear_extrude(height=center_height, center=true) {
minkowski() {
square([center_length-2*rounding, center_width-2*rounding], center=true);
circle(r=rounding);
}
}
// tab
union() {
rotate([0,center_tab_angle,0]) {
translate([-center_tab_thickness/2,0,(center_tab_height + center_height)/2]) {
difference() {
cube([center_tab_thickness, center_width, center_tab_height + center_height], center=true);
translate([0,
center_width/2-attach_hole_diameter,
(center_tab_height+center_height)/2-attach_hole_diameter]) {
rotate([0,90,0]) {
cylinder(d=attach_hole_diameter,h=center_tab_thickness + 0.1, center=true);
}
}
}
}
}
}
translate([-center_tab_thickness,0,(center_height)/2]) {
rotate([0,-center_tab_angle,0]) {
cube([center_tab_thickness, center_width, center_tab_thickness], center=true);
}
}
}
translate([center_length/4,0,0]) {
cube([center_length/2 + 0.1, arm_thickness + hinge_tolerance, center_height + 0.1], center=true);
}
translate([0,arm_thickness/2,0]) {
cylinder(d1=arm_thickness*1.25,d2=0,h=center_height+0.1, center=true);
}
translate([0,arm_thickness/-2,0]) {
cylinder(d1=arm_thickness*1.25,d2=0,h=center_height+0.1, center=true);
}
//thumb hinge small hole
translate([(center_length - arm_thickness)/2,
-center_width/2,
0]) {
rotate([90,0,0]) {
cylinder(d=screw_diameter, h=center_width + 0.1, center=true);
}
}
//thumb hinge large hole
translate([(center_length - arm_thickness)/2,
center_width/2,
0]) {
rotate([90,0,0]) {
cylinder(d=screw_diameter+screw_tolerance, h=center_width + 0.1, center=true);
}
}
// arm hinges
translate([-(center_length - arm_thickness)/2,
-(center_width - arm_thickness)/2,
0]) {
cylinder(d=screw_diameter, h=arm_thickness + 0.1, center=true);
}
translate([-(center_length - arm_thickness)/2,
(center_width - arm_thickness)/2,
0]) {
cylinder(d=screw_diameter, h=arm_thickness + 0.1, center=true);
}
}
}
center();
translate([0, 2 * arm_tooth_length, 0]) {
thumb();
}
translate([0, 4 * arm_tooth_length, 0]) {
arm();
}
translate([0, 6 * arm_tooth_length, 0]) {
arm();
}