Upright drill presses are classified as to size by which specification?

• A. The largest diameter disk which can be drilled through the center
• B. The weight of the machine
• C. The horsepower rating
• D. The spindle taper size

Answer: (A)

Size classification for upright drill presses is based on capacity to center-drill a circular workpiece. The most practical way to express that capacity is the largest diameter disk that can be drilled through the center, because it shows how big a round workpiece you can center under the spindle and bore a hole exactly through its center without interference from the table or column. Weight, horsepower, and spindle taper affect how hard the machine can work or what tooling it uses, but they don’t define the size category.