Machining Operations

Question 1

What are some classifications of machined parts?

Answer 1

Rotational or nonrotational

Question 2

How are rotational figures shaped?

Answer 2

Cylindrical or disk-like (piece is rotated to form circular shape)

Question 3

What form do nonrotational pieces take?

Answer 3

Block or plate like structures

Question 4

What is generating?

Answer 4

When the feed trajectory of the tool is what determines the geometry of the part

Question 5

What is forming?

Answer 5

The shape of the tool part is what determines the geometry of the part

Question 6

What is turning?

Answer 6

Cutting tool touches workpiece at single point, where the piece is then rotated and the tool is fed towards the uncut material

Question 7

What machine performs turning?

Answer 7

Lathes

Question 8

What axes of motion do lathes have?

Answer 8

Across the workpiece, and into the workpiece

Question 9

Why are the cutting tools in lathes considered stationary?

Answer 9

The tool itself is placed at a point on the workpiece, and is moved across via the bed

Question 10

What types of turnings are generating?

Answer 10

Straight, taper, profile, grooving, facing, and face grooving

Question 11

What types of turnings are forming?

Answer 11

Form cutting, boring, drilling, removing, threading, and knurling

Question 12

What is facing?

Answer 12

Turning process that dulls the edges of a shaft; cutting tool is fed radially inward

Question 13

What is contouring?

Answer 13

Turning process where the feed is not linear, and instead follows a curved path

Question 14

What is chamfering?

Answer 14

Cutting tool angles the corner of a piece, dulling edges

Question 15

What is parting/cut-off?

Answer 15

Tool is radially inserted into work piece to cut off end of part

Question 16

What is threading?

Answer 16

Specially shaped cut tool is fed across workpiece at high feed rates, creating threads

Question 17

How can drilling be done through turning?

Answer 17

The drill bit is setup in the tailstock and pushed towards the workpiece

Question 18

What is the tailstock?

Answer 18

A part of the lathe the supports the free end of the workpiece

Question 19

Why might drilling through a lathe be more desired than regular drilling?

Answer 19

Since the drill bit is held by the tailstock, it is guaranteed to be on center relative to the stock material

Question 20

What is boring?

Answer 20

The turning process of enlarging holes made by drilling by feeding a boring bar through

Question 21

What is the feed rate?

Answer 21

the speed a tool is fed across the work piece; feed rate is given in terms of length/min, while feed is given in terms of length/revolution

Question 22

What is the ideal turning process in terms of number of procedures

Answer 22

One roughing cut, one finishing cut

Question 23

What is the chip’s cross-sectional area based on (turning)?

Answer 23

Feed and cut depth

Question 24

What is the cutting time based off of (turning)?

Answer 24

Length of piece and feed rate

Question 25

What are some specifications of the lathe?

Answer 25

Sizing, RPM, horsepower

Question 26

What is the lathe's bed?

Answer 26

Where headstock, tailstock, and carriage are held

Question 27

What is the headstock?

Answer 27

Lathe part that contains the spindle

Question 28

What is the spindle?

Answer 28

Lathe part that holds and rotates the workpiece

Question 29

What is the carriage?

Answer 29

Part that holds the cross slide, which houses the tool, also what feeds the tool into the workpiece

Question 30

What is the feed rod?

Answer 30

Allows the carriage to move

Question 31

What are some ways the piece is held in the lathe?

Answer 31

Between centers, chuck, collet, face plate

Question 32

How does holding the work between two centers work?

Answer 32

One center is held in head stock by dog (part that stabilizes and holds piece while it rotates), and the other end is held by a cone shaped point at tailstock

Question 33

How does holding the work with a chuck work?

Answer 33

Located at the headstock, chuck clamps down on workpiece, and chuck itself rotates

Question 34

How does holding the work with a collet work?

Answer 34

Cylindrical piece that squeezes down on work piece

Question 35

What is the difference between an engine and toolroom lathe?

Answer 35

Engine lathes are the general type found in shops, toolroom lathes are smaller but more accurate

Question 36

What is a turret lathe?

Answer 36

Swiss army lathe ("turret" holds various tools)

Question 37

What is the difference between drilling and turning?

Answer 37

Work piece is stationary, and does not rotate