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// FIDE Standards have some flexibility
// https://www.fide.com/FIDE/handbook/Standards_of_Chess_Equipment_and_tournament_venue.pdf
// FIDE Handbook C.02.2.2 Height,weight,proportions
// - King – 9.5 cm,
// - Queen – 8.5 cm,
// - Bishop – 7 cm,
// - Knight – 6 cm,
// - Rook – 5.5 cm and
// - Pawn – 5 cm.
// - The diameter of the piece's base should measure 40- 50% of its height.
// - These dimensions may differ up to 10% from the above recommendation,
// - but the order (e.g. King is higher than Queen etc.) must be kept.
// We are going to transgress C.02.2.3
// FIDE Handbook C.02.3.2 Size of the square and the board
// - The side of the square should measure 5 to 6 cm.
// - Referring to 2.2 the side of a square should be at least twice the diameter of a pawn’s base (it means four paws on one square).
use <../lib/bezier.scad>;
$fn = 8;
total_height = 7;
base_diameter = total_height / 2;
base_radius = base_diameter / 2;
base_height = 1;
stem_radius = base_radius / 4;
stem_base_radius = base_radius / 2;
head_radius = 1;
stem_height = total_height - base_height - head_radius - 1;
// collar_check enables collar
collar_check = 1;
collar_radius = head_radius * collar_check;
// Base
cylinder(base_height/2, base_radius, base_radius);
translate([0, 0, base_height/2])
cylinder(base_height, base_radius, 0);
// Stem
translate([0, 0, base_height])
cylinder(stem_height, stem_base_radius, stem_radius);
// Collar
translate([0, 0, total_height - (2.5 * head_radius)])
cylinder(0.5, collar_radius, 0);
// Head
control_points = [
[0, 0],
[0.75, 0],
[0, 1]
];
// adjust curve_facets for low & odd $fn values
curve_facets = $fn/2;
head_curve = bezier_curve(control_points, $fn=curve_facets);
difference() {
translate([0, 0, total_height - 2.5 * head_radius])
scale(2.25)
rotate([0, 0, 180])
rotate_extrude()
polygon(head_curve);
// Notch
translate([0, base_radius, 5.5])
rotate([45, 0, -90])
cube([base_diameter, base_diameter, 0.1]);
}
// Point
translate([0, 0, 6.75])
sphere(0.25);
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