//!OpenSCAD
thickness = 5;
kerf = 0.05;

tvalue = thickness + kerf;
size = 100;
center = 51;

circle(size);
    rotate([0,0,0]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,45]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,90]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,135]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,180]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,225]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,270]) translate([size/2+center,0,0]) square([size,tvalue],true);
    rotate([0,0,315]) translate([size/2+center,0,0]) square([size,tvalue],true);
}