Module 1: Assessment Quiz

Module: U7M1 - Lathe Anatomy & Turning Theory Duration: 20-30 minutes Passing Score: 70%

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What is the primary function of the headstock on a wood lathe?

To house the motor-driven spindle that rotates the workpiece

To support the free end of the workpiece

To hold cutting tools in position

To adjust the speed of the lathe

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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?

The headstock

The tailstock

The banjo

The tool rest

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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?

To measure spindle speed

To hold the workpiece between centers

To position and lock the tool rest base along the bed

To engage the indexing mechanism

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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?

Step-pulley belt drive

Gear-reduction drive

Electronic variable speed (EVS) drive

Direct-drive induction motor

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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?

The distance between the headstock and tailstock

The maximum length of the tool rest

The maximum diameter of workpiece that can be turned over the bed

The range of spindle speeds available

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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?

1500-2000 RPM

1000-1200 RPM

600-800 RPM

200-400 RPM

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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?

Dead center (fixed point)

Live center (rotating bearing center)

Cup center

Ring center

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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?

Excessive noise

Premature tool dulling

Dangerous vibration that can throw the workpiece or cause loss of control

Uneven finish quality

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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?

2 inches above center

At or slightly above center height

2 inches below center

At the top of the workpiece

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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?

Pressing the cutting edge hard into the wood

Holding the tool flat on the rest without contact

Placing the bevel (heel) against the wood first, then raising the handle to engage the cutting edge

Scraping the wood surface with the tool inverted

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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?

To thread accessories onto the spindle

To align the banjo with the bed

To provide a self-holding friction fit for centers, chucks, and accessories in the headstock and tailstock

To adjust the lathe bed alignment

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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?

To warm up the bearings

To check the belt tension

To verify the workpiece clears the tool rest and bed without striking anything

To lubricate the spindle

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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?

Turning with a chuck on the headstock

Turning with the tool rest between headstock and tailstock

Mounting the workpiece between a drive center in the headstock and a support center in the tailstock

Centering the tool rest on the lathe bed

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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.