I recently tested a pile of big drill bits for an article in Woodcraft magazine, coming out in the April/May issue (#82), and along the way I uncovered some amazing values in Forstner bits, which the magazine doesn’t mind me sharing with you. Here’s why this is big news: If you plan to do any woodworking at all, you can survive without Forstner bits for a while, but not long, not if you want to do really nice work.
Simply put, Forstners do everything that a normal drill bit does, but better, and they add a bag of magical tricks that no other bit can perform. Big holes with dead-flat bottoms? No problem. Drilling at an angle, or with the bit halfway off the wood? No sweat. Seriously. Forstners can do it all.
No doubt you’ll start your career with a standard set of twist drills, with the usual V-shaped tips. Sick of those wandering off the mark, you’ll discover brad-point bits, with a sharp tip that keeps the bit on track, and cutting spurs at the edges that ensure a clean entry. Sometime soon after that, you’ll need to drill holes bigger than 1/2 in.–which is the biggest bit in most kits.
At that point, you’ll head for the home center and see what you can find. Spade bits work pretty well, but they dull fast in hardwoods, and they have a long center spur that makes it hard to drill stopped holes in most boards. Hole saws work OK, but are pricey, considering the fact that they can’t drill stopped holes, and can’t go through anything thicker than about 3/4 in.
Enter the almighty Forstner. They are one of the priciest bits, but their meaty build and unique cutting geometry makes them extremely durable in the toughest woods. And no other bits drills cleaner, in more ways, or with a flatter bottom on stopped holes.
Get a set, say up to 2 in. or so, and you’ll find amazing ways to use them: clean counterbores for bolt heads, overlapping holes for clearing out almost all the wood in a mortise, decorative cutouts, dog holes in bench tops, and too much more to mention here.
By the way, ignore those folks who say Forstners can only be used in a drill press. They work just fine in handheld drills, as long as you start slowly and go in square. Save the angle and overlap tricks for the drill press.