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Radial drills are designed to drill a hole in a part that is too big to fit on a regular drill press. Radial drills have size designations that incorporate the arm length and the column diameter. The arm length of a radial drill typically ranges from about 2 feet to 12 feet or more. The arm measurement is not the arm length (even though it is called that), it is actually the distance from the face of the column to the center line of the spindle when the head is all the way out to the end of the arm. This means, a 6 feet radial drill can drill a hole in the center of a 12 feet diameter part. The column diameter can vary and depends on how heavy duty the radial drill is. For example, a 4 feet radial drill can come with a 9 inch column diameter (light duty), a 11inch column diameter (medium duty) or a 13 inch column diameter (heavy duty). Radial drill sizes are given like this 4 feet-11 inch not 4 feet x 11inch.
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