Turning

Question 1

What is a “turning” process

Answer 1

Removing material from the outside of the workpiece to create a specific diameter

Question 2

describes the “Headstock” on a lathe

Answer 2

The Headstock holds the bearings which support the spindle, which in turn is driven to rotate the workpiece.

Question 3

describes the “Tailstock” on a lathe

Answer 3

The Taislstock is a moving holder for various tools including drills and centres. It is not driven.

Question 4

What is a “parting off” process

Answer 4

cutting the workpiece to a specified length by driving the tool transversely into the workpiece to ‘part it off’

Question 5

3 Jaw chuck vs 4 jaw chuck

Answer 5

3 jaw chucks:
self-centering (all jaws move at the same time), quick to set up as component is automatically gripped, can only hold regular shapes

4 jaw chucks:
independent jaws that require you to center the workpiece, longer to set up, more accurate as it’s manually aligned, and can hold regular and irregular shapes

Question 6

What is the major difference between a Manual Centre lathe and a Capstan lathe?

Answer 6

Manual Centre Lathe:
- manual
- only one tool at a time
- has tailstock
- manual centring

Capstan Lathe:
- semi automatic (and it has pre set stops)
- front and rear tools available
- has turret head instead of tailstock
- automatic centring

Question 7

what are the three different types of lathe

Answer 7

• manual centre lathe
• capstan lathe (semi automatic)
• CNC lathe (fully automatic)

Question 8

what is “thread cutting”

Answer 8

Creates threads by cutting a helical ridge on the workpiece (screws)

Question 9

describe “boring”

Answer 9

boring on a lathe to remove internal material from a workpiece, straight and tapered holes can be created

Question 10

describe what “knurling” is

Answer 10

creates a textured surface on a workpiece by pressure or by cutting away material (pattern on a file)

Question 11

collet chuck

Answer 11

highly accuracy, only accommodates specified size workpiece

Question 12

what is a lead screw used for

Answer 12

to drive the saddle at a precise speed when cutting threads
(think of block moving along a rope)

Question 13

what is a feed shaft used for

Answer 13

to drive the saddle when precision isn’t needed, used because it’s cheaper than using precise parts saving them for wear
(Same as lead screw but smooth surface instead of thread pattern)

Question 14

describe what “facing” is

Answer 14

removing metal from the end of a workpiece to create a flat end surface

Question 15

describe the process of “turning between centres”

Answer 15

mount the component centrally on its axis held at both ends, a lathe drive dog is used at the headstock side of the lathe to rotate the workpiece.

• allows accurate transfer between processes