Task 3. Describe the various Threads forms, Uses, calculation. and Machining Techniques.

LATHE OPERATIONS - OD1645 - LESSON 1/TASK 3

LESSON 1

THE LATHE USES AND SAFETY; USES, REPAIR, AND

ADJUSTMENT OF LATHE ATTACHMENTS; AND VARIOUS

THREAD FORMS, USES, CALCULATIONS, AND

MACHINING TECHNIQUES

TASK 3.

Describe the various

threads

forms,

uses,

calculations,

and

machining techniques.

CONDITIONS

Within a self-study

environment

and

given

the

subcourse

text,

without

assistance.

STANDARDS

Within two hours

REFERENCES

No supplementary references are needed for this task.

Introduction

There are numerous mechanical devices used in modern technology to transmit

motion, force, and to fasten components together. One of these devices in

the screw thread. Screw threads are made in various forms, such as V-form

threads, Acme threads, and Square threads.

Each of these thread forms is

used for specific purposes.

The V-form threads are commonly used on

fastening devices such as bolts and nuts as well as on machine parts. Acme

threads are generally used for transmitting motion, such as between the lead

screw and lathe carriage.

Square threads are used to increase mechanical

advantage and to provide good clamping ability as in the screw jack or vise

screw. Each of these screw forms will be further discussed in this task.

Screw Thread Cutting.

102