Auger bits are another option for drilling large holes with a handheld drill, but they are better suited for drilling holes in very thick wood. Auger bits require a drill with a good amount of power, they can be difficult to wrestle, and they can leave a pretty rough hole behind. Hole saws can also get the job done, but they're slow and removing the plugs from the bit can be a challenge.

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The flat, broad blade of a spade bit has a pilot point attached to a 1/4-inch diameter shank that can be chucked into both regularly-chucked drills and quick-chuck impact drivers. Each edge of the flattened portion of the bit is sharpened, and the bottom corners of the sharpened area may have a pointed tip, depending on the style and brand of the bit. As the bit is turned by the drill motor, these two sharpened bottom edges will dig into the wood stock around the center pilot point, shaving wood out of the hole in a corkscrew-like manner. If the cutting edges of the bit are particularly sharp, very long shavings are sometimes produced by the drilling action.

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Also commonly known as paddle bits, spade bits have a wide, flat blade. They are commonly used by tradesmen such as electricians and plumbers for drilling holes in studs in walls for running wiring or pipes (auger bits and hole saws are also used for this), but they also have a place in the woodshop for drilling on fine woodworking projects.

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Drilling precise, large-diameter holes in a fine woodworking project can be challenging if you have to do it with a handheld drill rather than using a more precise drill press. Since the throat on the chuck of a handheld drill is smaller (typically 1/2inch or less) than the chuck on the drill press, there is a more limited selection of twist bits available. And a hand-held drill is not the best tool for drilling with Forstner bits—the very best choice for precise woodworking—because it is hard to keep the drill at a perfect 90-degree angle to the work piece, the way you can with a drill press.

A spade bit is relatively easy to use, but unlike a twist bit, which is somewhat forgiving, it is important for the shank of a spade bit to be perpendicular to the workpiece while drilling. To use a spade bit:

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Chris Baylor is a woodworking expert and writer with over a decade of hands-on commercial carpentry experience. He has studied under master carpenters and also designs wooden tools and furniture, sharing tutorials on websites including Woodworkers Workshop and Homemade Tools.

The milling strategies for removing masses of materiel have changed dramatically through the advent of lighter duty machines with high torque motors, increased spindle speeds and table rates. However, the formula for determining metal removal rates remains the same. Multiply the depth of cut by the width of cut and the feed rate to find cubic inches per minute of material removed.