Application of forstner bits

Forstner bits are mostly used in the woodworking industry to drill holes that are larger than those that can be made with ordinary drill bits.Forstner bit is designed to make precise holes that have flat bottoms (except for the small pilot point in the center) smooth sides and a clean entry cut with limited splintering in any type of wood.

Forstner bit can cut at angles or cut along the edges of a board with a drill press while the wood held firmly in place on the table beneath the drill bit, something that one would be hard-pressed to do with a spade or twist drill bit.

Less Tear Out

With a Forstner bit, there is less tear-out. The forstner bit is soft on the wood and only removes material when it is absolutely necessary.

For through holes in some wood,It is strongly recommended that you drill the hole with a backboard. If you want to get a through hole without a backboard,you should stop drilling when you feel the spur is just going to come out（the spur is just goes through the other side),then turn the borad over, start to drill at the exact same place,it just goes right through,and you get a perfect hole on either side.

Comparison

Twist bits can cut a relatively smooth-sided hole,but they are only available in smaller sizes than 1/2-inch and leaves a tapered bottom to the hole.

Spade bits are great for drilling quickly, but they cut far too aggressively to give a clean hole,they may leave a bit of a rough entry point and somewhat rough edges

Hole saws can be used to drill through holes of diameters up to 4 inches, but you cant cut a partial-depth hole with a hole saw?they have to be through holes.