Chapter 15: Other Lathe Operations

Drills over ____ in diameter require a pilot hole.

1/2″

What cutting speed is recommended when reaming on the lathe?

2/3 that of a similar drill size

Boring mills are used to bore small, delicate workpieces.

False

Holes that are to be reamed are drilled slightly oversize to allow sufficient stock for reaming.

False

Knurled patterns are created by cutting grooves into the workpiece.

False

An automatic screw machine performs a large number of operations either simultaneously or in a very rapid sequence.

True

Knurling should be performed before a shaft is turned to a smaller diameter.

True

The type and size of boring bar to be used is determined by the size of the hole to be bored.

True

How is a steady rest used?

When additional support is needed to prevent long and/or slender work from springing away from the cutting tool during machining. It also reduces chattering

What is a mandrel?

a slightly tapered, hardened steel shaft

What is sometimes used when several identical pieces must be produced?

a tracing or duplicating unit

Reaming is an operation used to produce a hole that is ____.

accurate in diameter and finish

When boring on a lathe, ____.

additional front clearance must be ground on the cutting tool to avoid rubbing

A grinding wheel must be ______________________________ and run true to obtain a smooth, accurately sized job.

balanced

The follower rest bolts to the ______________________________.

carriage

Accuracy in drilling requires a(n) ______________________________ starting point for the drill.

centered

Work mounted on a mandrel is usually machined between ______________________________.

centers

When boring on a lathe, additional front ______________________________ must be ground on the cutting tool to prevent it from rubbing.

clearance

How should a lathe be protected when using a tool post grinder?

cover the lathe bed, cross slide, and other parts with canvas or heavy kraft paper

When reaming on the lathe, use a ____.

cutting speed about 2/3 that of a similar size drill

A pilot hole should have a diameter equal to the larger drill's ______________________________.

dead center

Angular knurls raise a(n) ______________________________ pattern.

diamond

Grinding wheels are dressed with a(n) ______________________________ wheel dresser.

diamond

A(n) ______________________________ mandrel permits work with openings that are not a standard size to be turned.

expansion

The ______________________________ provides support directly in back of the cutting tool and moves along during the cut.

follower rest

Describe the knurling process.

forming a certain shape into the circumference of the stock for the purpose of a grip, looks, or increasing stock diameter

A(n) ______________________________ mandrel is helpful when several pieces must be turned.

gang

A ______________________________ (high/low) spindle speed is used for polishing.

high

Lathe filing requires a ______________________________ (high/low) spindle speed.

high

Boring is an internal machining operation ____.

in which a single-point tool is used to enlarge a hole

The ______________________________ method of filing is the safest way to file on a lathe.

left hand

A(n) ______________________________ lathe file has superior cutting action compared to a regular mill file.

long angle

What can be done to prevent work from freezing to a mandrel?

lubricate with light oil

Why should the largest possible boring bar be used for boring operations?

maximum rigidity

A boring bar is positioned ____ for machining.

on or slightly below center

The steady rest and follower rest are used to perform all of the following tasks except ____.

reduce side pressures on the work

When boring with long, slender boring bars, chatter may occur but can usually be eliminated by ____.

reducing tool overhang

The automatic screw machine has been developed for the high-speed production of large numbers of ______________________________ (small/large) parts.

small

A(n) ______________________________ mandrel is made from hardened steel that has been machined with a slight taper.

solid

The hole size to be bored determines all of the following except ____.

spindle speed

Holding a file ______________________________ against the rotating work will cause it to load with metal and score the surface of the work.

stationary

When drilling on a lathe, drills larger than 1/2″ (12.5 mm) in diameter usually have ______________________________ shanks.

taper

Why is boring done?

to expand holes accurately that are concentric with the stock diameter

Filing on a lathe should be kept to a minimum. When is filing recommended?

to remove burs, round off edges, and blend in form cut lines

What will cause the workpiece to bend permanently when being knurled?

too much pressure

A boring bar should extend from the ______________________________ only far enough to do the job.

tool holder

Limited production runs are sometimes produced on a manually-operated ______________________________ lathe.

turret

Work that is too large or too heavy to be turned in a horizontal position is machined on a(n) ______________________________.

vertical lathe

The steady rest is bolted directly to the ______________________________.

ways

What will occur if too much pressure is applied when knurling?

work surface becomes hardened during the op and the knurled section could "flake off". also tends to bend the shaft