Mill Day — Fireside Farm SawmillUsually milling day is fine I ve heard you use the terms 4/4 four quarter 5/4 five quarter and 6/4 six quarter etc What does this mean Sawyers and woodworkers sometimes think about thickness relative to the inch scale Hence 5/4 is the same as 1 1/4 thick This comes in handy just as a matter of speech How much dimensional thickness should I add for planing And how thin ca