Lathe and Milling Machines Basics

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Questions and Answers

What type of milling operation produces a flat horizontal surface parallel to the axis of rotation?

Plain milling (correct)

End milling

Face milling

Angular milling

Which milling operation is used to create flat vertical surfaces?

Face milling

Form milling

End milling

Side milling (correct)

Which method is utilized to adjust the depth of cut in side milling?

Rotating the spindle

Changing the cutter size

Modifying the table height

Adjusting the vertical feed screw (correct)

Which milling operation allows for producing surfaces at angles other than right angles?

Angular milling Signup and view all the answers

End milling can produce flat surfaces that are:

Horizontal, vertical, or at an angle Signup and view all the answers

What is the primary purpose of face milling?

To grind away at the top of the workpiece Signup and view all the answers

In form milling, the operation is characterized by:

Creating irregular contours Signup and view all the answers

Which milling operation involves the cutter being positioned perpendicular to the workpiece?

Face milling Signup and view all the answers

What is the primary function of the lead screw in a lathe?

To cut threads Signup and view all the answers

Which operation is used to produce a flat surface at the end of parts?

Facing Signup and view all the answers

What is the purpose of knurling on cylindrical surfaces?

To produce regularly shaped roughness Signup and view all the answers

Which machining process enhances accuracy and surface finish by following drilling?

Boring Signup and view all the answers

What type of movement does a milling machine perform with its rotary cutter?

In multiple axes Signup and view all the answers

What is a significant advantage of using a milling machine over other machines?

Ability to hold multiple cutters Signup and view all the answers

Which operation is primarily used for producing external or internal threads?

Threading Signup and view all the answers

What type of workpieces can turning produce?

Straight, conical, curved, or grooved workpieces Signup and view all the answers

What is the primary function of a lathe machine?

To remove metal to give the work the required shape and size Signup and view all the answers

Which of the following operations can be performed on a lathe machine?

Sanding Signup and view all the answers

What is the purpose of the chuck in a lathe machine?

To hold and rotate the workpiece Signup and view all the answers

Which component of the lathe supports all the main parts?

Bed Signup and view all the answers

How is the tailstock on a lathe machine typically adjusted?

It can slide along the bed to accommodate the length of the workpiece. Signup and view all the answers

What material is typically used for the bed of a lathe machine?

Cast iron Signup and view all the answers

What operation does 'knurling' refer to in lathe machining?

Creating a pattern on the surface of a workpiece Signup and view all the answers

In lathe terminology, what does 'facing' refer to?

Applying a smooth finish to the workpiece surface Signup and view all the answers

Study Notes

Experiment 5: Lathe and Milling Machines

Aim: To study the various parts of lathes and milling machines and gain knowledge of basic operations.
Objectives:
- Describe how lathes and milling machines operate.
- Identify various types of lathes and milling machines.

Lathe Machine

Function: The main function of a lathe is to remove metal from a workpiece to achieve the desired shape and size. This is done by holding the workpiece securely and turning it against a cutting tool.
Operation: The lathe machine rotates the workpiece about an axis, and cutting tools are applied to create symmetry.
Types of Operations: The lathe can perform various operations, including cutting, sanding, knurling, drilling, deformation, facing, and turning with tools. Common tasks include making crankshafts, table legs, camshafts, candlestick holders, bowls, and other symmetrical parts. The lathe machine can also handle metalwork, metal spinning, wood turning, and glass work.
Components (Diagrammed in page 5 and 6):
- Headstock
- Chuck
- Tool Post
- Compound Rest
- Tail Stock
- Feed Shaft
- Carriage
- Bed
- Lead Screw
- Spindle speed selector
- Headstock assembly
- Chip pan
- Apron
- Split-nut
- Clutch
- Dead center
- Tailstock quill
- Tailstock assembly
- Handwheel
Specific Operations:
- Turning: Producing straight, conical, curved, or grooved workpieces (e.g., shafts, spindles, pins, handles).
- Facing: Creating a flat surface on the end of parts.
- Knurling: Creating regularly shaped roughness on cylindrical surfaces.
- Threading: Producing external or internal threads.
- Drilling: Creating holes.

Milling Machine

Function: A milling machine is a machine tool used to remove metal from a workpiece as it is fed against the rotating multi-point cutter.
Operation: The machine uses rotary cutters to remove material by advancing a cutter into a workpiece.
Components (Diagrammed in page 16):
- Overarm
- Arbor Bracket
- Arbor
- Cutting Tool
- Machine Vice
- Table
- Cross Traverse Handle
- Knee
- Vertical Traverse Handle
Types of Operations:
- Plain Milling: Creates a flat, horizontal surface parallel to the milling cutter's axis. It's also known as slab milling.
- Side Milling: Produces flat surfaces on the side of the workpiece. The depth of cut is controlled by the table's vertical feed screw.
- Angular Milling: Produces angular surfaces on the workpiece not at right angles to the milling machine spindle.
- End Milling: Creates flat surfaces that can be vertical, horizontal, or at an angle to the table. The machine uses end milling cutters.
- Form Milling: Creates irregular or complex contours using form cutters.
Milling Machine Advantages:
- Holds multiple cutters simultaneously
- High precision
- Better surface finish compared to some other machines
- Machining a variety of toolroom work

Lathe vs. Milling Machine (page 25)

Axis: Lathe - 2 axes (x,z); Milling - 3 axes (x,y,z)
Tool: Lathe - single-point tool; Milling - multiple-point tools (rotating cutter).
Rotation: Lathe- workpiece rotates; Milling - Cutter rotates
Workpiece Shape: Lathe - usually circular/cylindrical; Milling - any shape

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Description

This quiz explores the functions and operations of lathe and milling machines. Participants will learn to identify various types of machines and understand their basic operational principles. Ideal for students interested in manufacturing and machining processes.