Turnin/Lathe Operations

Question 1

What kind of Operation is Turning/machining?

Answer 1

Secondary Operation: Other processes applied to the workpiece before

Question 2

Advantages of Turning/Machining?

Answer 2

Net Finished product

High accuracy

Question 3

Disadvantages of Turning/Machining?

Answer 3

Material waste

no strength advantages (grain flow uneffected)

Question 4

Turning Process Parts

Answer 4

Cylindrical with rotational symmetry

Question 5

What kind of materials can be machined?

Answer 5

every kind of material

Question 6

Kind of Machining Cuts

Answer 6

Roughing cuts:
-Remove large amounts of material quickly
-One or more
-Faster feeds & greater depths (0.1 to 0.75 inches)
-Lower speed
Finishing cuts:
-Achieve final dimensions, tolerances & surface finish
-One or more
-Slower feeds & smaller depths (0.03 to 0.075 inches)
-Higher speed

Question 7

Basics of Turning

Answer 7

• Single-point tool
  •Rotating cylindrical part
  •Tool fed parallel to the axis of rotation
  •Machine Tool –> Lathe

Question 8

Typical Parts of Lathe (name 5)

Answer 8

-Headstock (Motor and Spindle)
-Chuck: Holds the work piece
–Tailstock: Holds the center
–Carriage: Holds the tool post and moves it (on the ways) along the length of the work
–Lead screw: Used for cutting of threads
–Feed rod: Allows continuous feed motion
–Ways: Tracks which guide the carriage
–Tool post: Holds the tool

Question 9

Swing

Answer 9

Max diameter of workpiece can be turned on lathe

Question 10

Workholding Methods

Answer 10

Grasp the workpiece, center and support it in position along the spindle axis and rotate it:
Faceplate: 
- 4 Clamps
-Chuck (3 or 4 Jaw)
-Collet

Question 11

Single Point tools operations (name 3)

Answer 11

- Turning (or straight turning)
–Facing
–Taper turning
–Contour turning
–Chamfering
–Boring
–Threading

Question 12

Multi point tools operation and special tools

Answer 12

Multi point
-drilling
-tapping (produces thread w multi point tool)
Special:
Form turning
Cutoff
Knurling

Question 13

Boring Options

Answer 13

1: Rotating Workpiece- Boring bar not turning
2: Boring bar turning- Workpiece fed through it

Question 14

Forming and Knurling

Answer 14

Forming:
- Special designed tools moving radially inwards the workpiece
Knurling:
- Bringing roughness on workpiece (non slip Surface)
–> technically no machining operation (does not remove material

Question 15

Other Turning Operations

Answer 15

Drilling
Reaming: enlarging existing hole
Tapping: producing internal helica threads