chess: rook - added an alt model that looks better at minimal values

1 files changed, 77 insertions, 0 deletions

diff --git a/chess/rook_alt.scad b/chess/rook_alt.scad
new file mode 100644
index 0000000..a1d2f2b
--- /dev/null
+++ b/chess/rook_alt.scad
@@ -0,0 +1,77 @@
+
+// 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).
+
+
+// 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).
+
+$fn = 4;
+total_height = 5.5;
+base_diameter = total_height / 2;
+base_radius = base_diameter / 2;
+
+// How is the base height dependent on piece height?
+base_height = 1;
+
+// The rook has a wider stem
+stem_radius = base_radius / 2;
+stem_base_radius = base_radius * (3/4);
+
+// I like several different low poly designs for the castle ridges
+// I like the ridge going over the corner
+// I also like the simplicity of every other face having a ridge
+head_radius = 1;
+head_height = 1;
+stem_height = total_height - base_height - (head_height / 2);
+
+// ridge_offset will set the ridges to go over the corners
+ridge_offset_check = 1;
+ridge_offset = ridge_offset_check * ((360/$fn)/2);
+
+cylinder(base_height/2, r = base_radius);
+translate([0, 0, base_height/2]) 
+	cylinder(base_height/2, base_radius, stem_base_radius);
+translate([0, 0, base_height])
+	cylinder(stem_height, stem_base_radius, stem_radius);
+difference() {
+	translate([0, 0, total_height - head_height])
+		cylinder(head_height, r = head_radius);
+	translate([0, 0, total_height - (head_height/4)]) {
+		cylinder(head_height, r = head_radius * 0.75);
+		// this rotation will work for $fn = 8 or 6
+		for (i = [0:$fn]) {
+			rotate([0, 0, (i * (360/($fn))) - ridge_offset])
+				rotate_extrude(angle = 360/$fn)
+					square([head_radius, head_height]);
+		}		
+	}
+}