Module 1: Assessment Quiz
Module: U7M1 - Lathe Anatomy & Turning Theory
Duration: 20-30 minutes
Passing Score: 70%
What is the primary function of the headstock on a wood lathe?
Explanation: The headstock contains the spindle, bearings, and drive mechanism (belt/pulley or electronic variable speed) that provides rotational power to the workpiece. It is the powered end of the lathe.
What component slides along the lathe bed to support long workpieces during spindle turning?
Explanation: The tailstock slides along the bed ways and locks in position to provide support at the free end of long spindle workpieces via a live or dead center.
What is the purpose of the banjo on a wood lathe?
Explanation: The banjo clamps to the lathe bed and holds the tool rest post. It can be repositioned along the bed to bring the tool rest close to the area being turned.
Which drive system allows infinitely variable speed adjustment on modern wood lathes?
Explanation: EVS drives use a controller to adjust motor frequency or a DC motor's voltage, providing smooth, infinitely variable speed control without changing belts or pulleys.
What does the term "swing" refer to in wood lathe specifications?
Explanation: Swing is twice the distance from the spindle center to the bed surface. A lathe with a 16-inch swing can turn workpieces up to 16 inches in diameter over the bed.
What is the recommended starting RPM range for roughing a 10-inch diameter blank on a wood lathe?
Explanation: Larger diameter blanks require slower speeds. A general guideline is 6000-9000 divided by the diameter in inches. For a 10-inch blank: 600-900 RPM is appropriate for roughing to keep rim speed safe.
What type of center is preferred in the tailstock for most spindle turning operations?
Explanation: A live center has internal bearings that allow it to rotate with the workpiece, reducing friction and heat buildup. Dead centers can burn the wood at high speeds.
What is the primary safety concern when turning an out-of-balance workpiece?
Explanation: An unbalanced workpiece creates vibration that increases with RPM. Severe imbalance can loosen the workpiece from the drive center or chuck, creating a projectile hazard.
What is the correct height for the tool rest relative to the spindle centerline for most turning operations?
Explanation: The tool rest is typically set at or slightly above spindle center height. This allows proper bevel-rubbing technique and gives the turner optimal control over cutting angle.
Which of the following best describes the "bevel rubbing" technique in wood turning?
Explanation: Bevel rubbing is the foundational technique in wood turning. The bevel behind the cutting edge rides on the wood surface, providing support and control. The cut is initiated by raising the handle to bring the edge into contact.
What is the function of the Morse taper in wood lathe construction?
Explanation: Morse tapers (commonly #1 or #2 on wood lathes) use a precise taper angle to create a friction fit that self-centers and holds accessories securely. They can be ejected with a knockout bar.
Why should the lathe be turned by hand before engaging the motor?
Explanation: Hand-rotating the workpiece before powering on ensures there is adequate clearance between the workpiece and the tool rest, banjo, and bed. This prevents dangerous catches and thrown workpieces on startup.
What does "between centers" turning refer to?
Explanation: Between-centers turning uses a spur or steb drive center in the headstock to grip and rotate the wood, while a live center in the tailstock supports the opposite end. This is the fundamental spindle turning setup.