This might help you, at least I've used this method in the past. Lay out your total pattern using whatever spacing suits you I normal use 18 / 20 lines. Next just touch the lines with a 60 deg cutter sometimes I do it after the next step / both. To deepen the lines I bought several "hobby hack saws" 30 some teeth to the inch and run all the lines about 1/32" deep more or less. The blades on these saws are about 4" long so as you wear out the tip you can just grind it off to new teeth. Rather more time consuming but will give you very flat checkering, I like this style a lot. FWIW --- John Can.
