Lathe Final

If your sample thread is V-shaped, 1/2 in., with 13 threads per inch, what is the approximate depth of the thread, using the formula Depth = .866 X Pitch

.0667 in

If you must cut an internal thread that is 7/8 in., with 12 threads per inch, what is the approximate size of the hole you must drill in the workpiece

.792 in.

If your lathe ratio is 1:1, and your workpiece is 2 in. (5.08 cm), and you set the cross-slide feed dial to .020 in. (.0508 cm), what is the diameter of your workpiece after the first cut

1.980 in. (5.029 cm)

What is the sfm (m/min) if the workpiece diameter is 3.5 inches (88.9 mm) and the rpm is 2500 during a turning operation

2,290.6 sfm (698.2 m/min)

A sample part is 6 inches long. It has a tapered section that is 4.2 inches long. The large diameter is 2.3 inches, and the small diameter is 1.5 inches. What is the tpf (taper per foot((D-d)/L) x12)

2.286

A cam is

A cylindrical plate-like component that rotates to control feed and depth of cut

Information about the cutting edges of a carbide insert indicate whether or not the insert has

A honed edge, chamfers, or roundedness

What is the best definition of a lathe

A metal cutting machine used to create cylindrical workpieces by rotating a workpiece against a stationary cutting tool

Which statement is true about safety hazards on the manual mill

Always keep a safe distance from the point of operation

What actions should an operator take if cutting tools are wearing away excessively during a production run

An operator should first try reducing cutting speed and then try reducing feed rates

Collets

Are available in standard sizes

Which statement about insert shape is true

As cutting edge strength increases, the versatility of the insert decreases

Why is it difficult to machine a steep taper precisely using the compound rest

Because the compound rest dial is usually graduated in 1 degree increments

The lathe what is located on the right side of the head-stock and is the foundation of the entire machine

Bed

Which list contains common ID cutting operations performed on the lathe

Boring, drilling, tapping

When mounting a part between two centers, the workpiece must often be

Center-drilled. The most popular type of cutting tool used on the engine lathe is the? Single-point cutting tool used for turning

A workholding device that consists of three or four jaws that clamp down on the end of a workpiece is a

Chuck

What cutting variable most impacts the choice of insert size

Depth of cut

When cutting an external thread, what is the correct action to take once the line on the thread dial is even with the proper reference mark

Engage the half-nut lever

Which of the following statements is true about center drilling

Establishes a true centerline diameter on the workpiece

Which list contains common OD cutting operations performed on the lathe

Facing, Turning, Threading

Which list contains only outer-diameter operations

Facing, form turning, taper turning

Which statement identifies the most common hazards during metal cutting

Flying chips, broken tools, and contact with rotation components

What is a very long threaded rod supported by bearings at both ends

Leadscrew

The best way to make sure that the workpiece runs true to the center of the spindle is to

Locate a dial indicator on the workpiece and adjust to zero

Which of the following statements about tapered parts is true

Long tapers are self-holding tapers that fit into a spindle

Which statement is true about common workholding setups on the lathe

Longer workpieces are held by the chuck on one end and a center on the opposite end

Which of the following statements about threading on the lathe is true

Lower turning speed and higher feed rate

The primary purpose of a screw machine is to manufacture

Make small cylindrical parts with automated production rates

Sampling plans contribute to a quality control process by

Providing an acceptable representation of all the parts produced

What is the difference between the smallest and largest workpiece diameter that a chuck can hold

Range

What is the purpose of using constant surface speed (CSS) on the CNC machine, CSS adjusts

Revolutions per minute according to workpiece diameter to keep the sfm constant

What is the most common type of surface finish call out

Roughness

The first thing to do when constructing an inspection plan is to

Select the critical and important dimensions to inspect

When recommended settings are not optimal, machinists often determine the best spindle speed through

Sense of feel

Which statement about chipbreakers is true

Single-sided chipbreakers are most useful for heavy, severe machining operations

What lathe cutting variable describes the rate of workpiece rotation

Speed

What is the part of the machine that holds and rotates work during machining

Spindle

Which list contains only lathes

Swiss-type screw machine, CNC turning center, vertical turning machine, multiple-spindle screw machine

If you are using carbide inserts for turning on the lathe

The carbide insert is fitted in a matching tooholder and clamped in place

How would the size of an insert be measured by ANSI

The diameter of the inscribed circle

Insert type addresses physical features of an insert, including

The presence and size of chipbreaker surfaces

How does workpiece diameter affect sfm when rpm is constant

The sfm increases as workpiece diameter increases

The typical ANSI insert identification number describes

The shape and size of an insert

Which taper turning method is impossible to use for turning internal tapers

The tailstock offset method

Which taper turning method would be best for turning a long taper

The taper attachment method

Which statement about triangle- and diamond-shaped inserts is true

The triangle insert offers a larger end cutting edge angle, which increases versatility

Which statement is true about proper setup for threading on the lathe

To cut a 60° right-hand external thread, set the compound rest 29° to the right

The most important factor in selecting measuring tools for inspection is to

Tolerancing of dimensions to inspect

Which of the following does speed have the greatest effect on

Tool life

Which is true about cutting tool selection

Turning requires a single-point tool

Which list contains common operations performed on a manual lathe

Turning, boring, reaming

The visual reference in the workpiece that indicates where the thread will end is known as the

Undercut

Which statement best describes threading on the manual lathe

Uses a single-point tool to cut a spiraling ridge around a cylindrical part

Which of the following methods of checking a taper requires the use of layout dye

Using a taper ring gage

When using the tailstock offset method, how is work usually mounted on the lathe

Work is usually mounted between centers

The A supports the lathe cutting tool and provides the tool with the movement needed to perform machining operation. It slides along the ways and contains two primary sections called the B and the C

carriage: saddle: apron

The what of a lathe is determined by the biggest diameter workpiece that can be mounted in the spindle without touching the ways, and the what determines the distance the headstock to the end of the bed

swing: bed length

Which of the following statements is true about boring

It's performed after drilling to increase the accuracy of a hole

Inspection plans are needed to

Coordinate inspection procedures, check dimensions in a repeatable and reliable way & identify measuring tools

Which cutting point characteristic describes the roundness of the cutting point

Corner radius

Who produces the optimal speed and feed selection charts

Cutting tool manufacturers

Which statement about dedicated and universal workholding devices is true

Dedicated workholding devices are paired with complex workpieces, and universal workholding devices are paired with simple workpieces

Which statement about workpiece material is true

Hard, brittle metals produce short, discontinuous chips

Precision inserts

Have every side and edge ground

The blank is located at the upper-left side of the engine lathe

Headstock

The primary function of the tailstock is to

Hold the center and support the end of the workpiece

The primary function of the spindle is to

Hold the workholding device and rotate the workpiece

Which statement about tool geometry is true, effective tool geometry often

Improves workpiece finish

How is feed rate measured for a turning or boring operation

Inch (millimeter) per revolution

What type of cutting variables should a machinist select for a closely toleranced part requiring an above-average surface finish

Increased speed and less aggressive feed