PPE. The Lathe, and Lathe Accessories (Week 5)

Question 1

What PPE (Personal Protective Equipment) is required for Bandsaw?

Answer 1

Safety glasses must be worn at all times in work areas. Long and loose hair must be contained. Hearing protection must be worn. Sturdy footwear must be worn at all times in work areas.

Question 2

What must have occurred before operating the benchtop grinder?

Answer 2

You must receive basic shop safety training and equipment specific training before using this tool. You must wear appropriate PPE and follow all shop rules.

Question 3

When starting up the bench grinder, where is the recommended location

Answer 3

Stand to the side of the wheels.

Question 4

What PPE is needed for turning and milling?

Answer 4

Safety glasses must be worn at all times in work areas,

Long and loose hair must be contained (cover or tip up long hair)

Gloves must not be worn when using/operating this machine;

Sturdy footwear must be worn at all times in work areas.

Don’t wear jewelry
Don’t wear loose clothing

Question 5

Which type of Conventional Lathe is used in the labs?

Answer 5

Bench / Center / Engine Lathe

Question 6

What is the definition of a Lathe Machine?

Answer 6

A lathe machine is a machine tool that is used to remove metals from a workpiece to give a desired shape and size.

Question 7

How many Axes does a Lathe have?

Answer 7

2 axis

Question 8

What are the 2 Axes on a lathe?

Answer 8

1.←z-axis - Feed movement (regarding the tool)

2.↑ x-axis - Cutting depth movement (regarding the tool)

Question 9

What are the 4 main parts of a Lathe?

Answer 9

1. Headstock
2. Tailstock
3. Carriage
4. Bed

Question 10

When is a Tailstock used?

Answer 10

It is usually used to apply support to the longitudinal rotary axis of a workpiece being machined. It is also used on a lathe to hold drilling or reaming tools for machining a hole in the workpiece. Also, tapping and tapper cut.

Question 11

Regarding a tailstock, what is the difference between dead and live centers?

Answer 11

A live center is mounted in bearings and rotates with the work.

A dead center does not rotate.

Question 12

How do you determine the size of a lathe?

Answer 12

Indicated by the swing, the length of the bed, and the distance between centers.

Question 13

What are the two catergories of Lathe Accesories?

Answer 13

Cutting-tool-holding devices
* Straight and offset tool-holders
* Threading toolholders, boring bars
* Turret-type tool-posts

Work-holding, -supporting, and –driving devices
* Lathe centers, chucks, faceplates
* Mandrels, steady and follower rests
* Lathe dogs, drive plates

Question 14

What are Lathe tool holders designed for?

Answer 14

Lathe tool holders are designed to safely hold a cutting tool in a precise location.

Question 15

Some types of Lathe Tool Holders?

Answer 15

Quick change tap holder

Radial floating collet chuck

Jacobs taper tooling

Morse taper tooling

Custom tool holder

Question 16

What is a Brazed Carbide insert tooling?

Answer 16

One form of insert tooling is a brazed carbide tool. These tools have a carbide cutting blank affixed to a steel shank by brazing.

Question 17

Traits of a Indexable Insert?

Answer 17

Held in the holder by cam action or clamps

Types available
– Conventional
– Turret-type
– Heavy-duty tool-posts

Inserts are usually mounted on seats that fit within pockets in the end of the toolholder.

Inserts are classified by their shape.

Question 18

What are 3 types of Cutting-tool-holding devices?

Answer 18

1. Left-Hand Offset Tool holder
2. Right-Hand Offset Toolholder
3. Straight Toolholder

Question 19

Traits of Left-Hand Offset Tool holder?

Answer 19

• Offset to the right
• Designed for machining work close to chuck and cutting left to right
• Designated by letter L

(left hand thumb direction indicates tool feed direction).

(away from chuck)

Question 20

Traits of Right-Hand Offset Toolholder?

Answer 20

• Offset to the left
• Designed for machining work close to the tailstock and cutting right to left
  – Also, for facing operations
• Designated by letter R

(right hand
thumb direction indicates tool feed direction).

(towards chuck)

Question 21

Traits of Straight Toolholder?

Answer 21

• General-purpose type
• Used for taking cuts in either direction and for general machining operations

Question 22

Traits of Cutting-Off (Parting) Tools?

Answer 22

• Used when work must be grooved or parted off
• Long, thin cutting-off blade locked securely in tool holder by either cam lock or locking nut
• Three types of parting tool-holders
  – Left-hand
  – Right-hand
  – Straight

Question 23

Traits of Threading Tool-holder?

Answer 23

• Designed to hold the special form-relieved thread-cutting tool
• Has accurately ground 60º angle
  – Maintained throughout the life of the tool
• Only the top of the cutting surface sharpened when becomes dull

Question 24

What is a Chuck?

Answer 24

Used extensively for holding work for machining operations - Work large or unusual shape

Question 25

What are the 2 most commonly used Lathe Chucks?

Answer 25

1. Three-jaw universal 2. Four-jaw independent

Question 26

What are the uses of a Lathe Center?

Answer 26

Work to be turned between centers must have center hole drilled in each end. – Provides bearing surface Support during cutting Most common have solid Morse taper shank 60º centers, steel with carbide tips.

Question 27

What is a Steady Rest? When is it needed?

Answer 27

A steady rest is basically a heavy and rigid ring a fixed to the bed ways of a lathe or turning center. It stands stationary from a rigid mounting on the bed, and it supports the workpiece at the rest's center, typically with three contact points 120° apart. Steady rests are needed when the length and stiffness of a workpiece makes it difficult to machine without distorting or deflecting the part.

Question 28

Define Lathe Operation : Turning

Answer 28

A cutting operation in which single point cutting tool removes material from a rotating work-piece to generate a cylinder

Question 29

Define Lathe Operation : Facing

Answer 29

The tool is fed radially inward- An operation of reducing the length/thickness of stock

Question 30

Define Lathe Operation : Form Cutting

Answer 30

The tool has a certain shape that is imparted on the workpiece by feeding the tooling radially

Question 31

Define Lathe Operation : Taper Turning

Answer 31

Instead of feeding the tool parallel to the axis of rotation, the tool is fed at an angle thus creating a tapered rotational shape

Question 32

Define Lathe Operation : Contour Turning

Answer 32

Instead of feeding the tool parallel to the axis of rotation, the tool follows a contour that is other than straight, thus creating a contoured shape

Question 33

Define Lathe Operation : Parting off

Answer 33

The tool is fed radially into rotating work at some location to cut off the end of part

Question 34

Define Lathe Operation : Drilling

Answer 34

Drilling is an operation of making a hole. The drill (multi-point cutting tool) is fed parallel to the axis of rotation.

Question 35

Define Lathe Operation : Thread Cutting

Answer 35

The pointed form tool is fed linearly across the surface of the rotating work part parallel to the axis of rotation at a large feed rate, thus creating threads

Question 36

Define Lathe Operation : Boring

Answer 36

A single-point tool is fed linearly, parallel to the axis of rotation, on the inside diameter of an existing hole in the part. The purpose of boring is to enlarge the size of an existing hole

Question 37

Define Lathe Operation : Reaming

Answer 37

Reaming is an operation of making a drilled hole accurate and clean.

Question 38

Define Lathe Operation : Knurling

Answer 38

This is an operation in which a regular cross-hatched pattern is imparted on the workpiece. This pattern facilitates holding a part. Knurling is not a machining operation, as no cutting takes place. Instead, it is a metal forming operation done in lathe machine

Question 39

Define Lathe Operation : Chamfering

Answer 39

The cutting edge cuts an angle on the corner of the cylinder, forming a "chamfer"