// A clock face: cut outline, scored minute marks, engraved hours.

size = 150; // [100:5:300]
marks = 60; // [12:12:120]
hole = 8; // [5:0.5:12]

r = size / 2;
difference() {
  circle(r = r, $fn = 180);
  circle(d = hole);
}
score() for (i = [0:marks - 1]) {
  long = i % (marks / 12) == 0;
  rotate(i * 360 / marks) line([r - (long ? 12 : 7), 0], [r - 4, 0]);
}
engrave() for (h = [1:12])
  rotate(90 - h * 30) translate([r - 22, 0]) rotate(h * 30 - 90)
    text(str(h), r / 7, halign = "center", valign = "center");