Introduction to Centre Lathe Machine

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What is the main function of a lathe machine?

Adding material to the workpiece

Holding the workpiece securely

Joining two workpieces together

Producing chips from the cutting tool (correct)

Who is credited with designing the first screw cutting lathe?

Henry Maudslay (correct)

Greek engineers

Egyptian artisans

Italian inventors

What type of cutting tool is generally used with lathes?

Multipoint cutting tool

Water jet cutting tool

Laser cutting tool

Single point cutting tool (correct)

Which classification of lathes occupies less floor space?

Vertical lathes Signup and view all the answers

What distinguishes general-purpose lathes from single-purpose lathes?

Type of operations carried out Signup and view all the answers

In what year did Henry Maudslay design the first screw cutting lathe?

1797 Signup and view all the answers

What type of lathe is used for extremely small size jobs and precision work?

Swiss type automatic lathe Signup and view all the answers

Which type of jobs are typically held in collets in a lathe?

Slender rod like jobs Signup and view all the answers

What part of a center lathe holds the spindle and transmits power and rotation to the job?

Headstock Signup and view all the answers

In a lathe, what is the function of the tailstock?

Supporting longer blanks Signup and view all the answers

Which part of a lathe is used for giving various movements to the tool by hand and by power?

Saddle Signup and view all the answers

What is the purpose of the cross-slide on a lathe?

Setting the tool for angular cuts during taper turning Signup and view all the answers

What is the main function of the compound rest on a lathe?

Setting the tool for angular cuts during taper turning Signup and view all the answers

What is mounted on top of the saddle on a lathe?

Cross-slide Signup and view all the answers

What moves alone to guide ways on a lathe?

Saddle Signup and view all the answers

What carries the spindle and transmits power and rotation to the job in a center lathe?

Headstock Signup and view all the answers

What is the purpose of the back gears in a lathe machine?

To change spindle speeds indirectly Signup and view all the answers

How are different spindle speeds obtained in an all geared headstock lathe?

By shifting levers to change gear combinations Signup and view all the answers

What is a key function of the feed mechanism in a lathe machine?

To transmit power from the spindle to the carriage Signup and view all the answers

In a lathe machine, what is the primary advantage of using an all geared headstock over a cone pulley mechanism?

Eliminates belt shifting Signup and view all the answers

When are back gears typically engaged in a lathe machine?

For obtaining direct speeds Signup and view all the answers

Which statement best describes how an all geared headstock lathe operates?

It has gears that can be moved axially to mesh with each other. Signup and view all the answers

What advantage does using back gears in a lathe machine provide?

Constant tool power Signup and view all the answers

Which component is responsible for converting rotary motion into linear motion in a lathe machine?

Feed mechanism Signup and view all the answers

In what scenario would you engage the back gears in a lathe machine by using lever L?

When you want to reduce spindle speed. Signup and view all the answers

Why is an all geared headstock preferred over a cone pulley mechanism in modern lathes?

It eliminates belt shifting. Signup and view all the answers

What is the purpose of the quick-change gear box in the lathe?

To provide various power feeds in the lathe Signup and view all the answers

How many different speeds can Shaft C receive in the quick-change gearbox setup?

36 Signup and view all the answers

In the tumbler gear quick-change gear box, what is connected to the lead screw or feed rod?

The driven shaft Signup and view all the answers

What is the function of a splined shaft in the apron mechanism of the lathe?

To engage the gears F and G with the feed check shaft Signup and view all the answers

What happens when the feed check knob 'E' is in a neutral position in the apron mechanism?

Power is not transmitted to cross feed screw or carriage Signup and view all the answers

What is used for thread cutting in the lathe setup?

Lead screw Signup and view all the answers

How are various speeds obtained in the tumbler gear quick-change gear box?

By sliding the sliding gear and engaging the tumbler gear Signup and view all the answers

What connects Shaft C to the lead screw in the quick-change gearbox setup?

A clutch Signup and view all the answers

What is attached with worm wheel in the apron mechanism of the lathe?

A splined shaft Signup and view all the answers

How many different sizes of gears are keyed with Shaft A in the quick-change gearbox?

9 Signup and view all the answers

How is automatic longitudinal feed achieved on a lathe machine?

By engaging rotating gear G with gear H Signup and view all the answers

What mechanism is used to reverse both longitudinal and cross feed on a lathe machine?

Clutch operated bevel gear reversing mechanism Signup and view all the answers

In a modern heavy-duty lathe, what mechanism replaces the non-rigid tumbler gear mechanism for feed reversing?

Bevel gear feed reversing mechanism Signup and view all the answers

What type of chuck is commonly used for holding non-circular bars in a centre lathe?

4-jaw independent chuck Signup and view all the answers

Which device is best suited for holding work pieces that cannot be conveniently held between centres or by chucks?

Face plate Signup and view all the answers

What provides the necessary rigidity in construction for the bevel gear feed reversing mechanism in a lathe?

Clutch operated bevel gear reversing mechanism Signup and view all the answers

How are jaws moved radially in a 4-jaw independent chuck?

By rotating the corresponding screws which push the rack provided on each jaw Signup and view all the answers

What is the purpose of an angle plate in a lathe setup?

Holding work pieces at right angles to each other Signup and view all the answers

Which mechanism replaces the tumbler gear mechanism for feed reversing in a modern heavy-duty lathe?

Bevel gear feed reversing mechanism Signup and view all the answers

When is a face plate typically used in a lathe setup?

For work pieces that cannot be held by chucks or between centres Signup and view all the answers

What is the purpose of using an angle plate along with the face plate?

To hold and rotate eccentric or unsymmetrical jobs Signup and view all the answers

What is the function of a catch plate or driving plate?

To drive the work piece through a carrier or dog Signup and view all the answers

Why are mandrels made of high carbon steel?

To avoid distortion and wear Signup and view all the answers

When is a revolving centre preferably used?

When desired to avoid sliding friction between job and centre Signup and view all the answers

What is the purpose of using a steady rest or follower rest?

To prevent sagging of slender rods during machining Signup and view all the answers

What type of centre has a ball-shaped end to minimize wear and strain?

Ball centre Signup and view all the answers

'Tipped centre' has what feature to make it highly wear-resistant?

Brazed hard alloy tip Signup and view all the answers

'Insert type centre' allows for replacing what component instead of the whole centre?

'Steel 'insert'' Signup and view all the answers

'Pipe centre' is specifically used for supporting which types of objects?

Hollow work pieces Signup and view all the answers

Which additional support helps prevent deflection of long slender jobs due to sagging during machining?

Steady rest Signup and view all the answers

What is the main reason for using a tipped tool brazed to the carbon steel shank?

Flexibility in tool shape Signup and view all the answers

Why are ceramic tips clamped to the end of a shank instead of being brazed on?

To ensure rigidity Signup and view all the answers

What distinguishes solid tools from tools inserted in a holder?

Method of attachment to the lathe Signup and view all the answers

What is the benefit of using high-speed steel in tipped tools?

Higher resistance to wear Signup and view all the answers

Why are ceramic inserts clamped in rectangular sectioned steel bars?

To ensure stability during cutting operations Signup and view all the answers

What is the primary reason for using carbide inserts in tool holders?

Resistance to wear Signup and view all the answers

In what situation would a mechanic fastened tipped tool be preferred over a brazed tip tool?

When rigidity is required Signup and view all the answers

Why are high-speed steel tips sometimes brazed onto a carbon steel shank?

To enhance durability of the tool tip Signup and view all the answers

What benefit does mechanically clamping carbide inserts offer over ceramic inserts?

Increased stability during cutting Signup and view all the answers

Why would a manufacturer choose forged tools over tipped tools?

When precision machining is not critical Signup and view all the answers

What is the term for the lower part of the carriage attached to the saddle?

Saddle apron Signup and view all the answers

How is the longitudinal feed achieved in a lathe?

By moving the compound slide Signup and view all the answers

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

To move the carriage or cross-slide for various operations Signup and view all the answers

Which part of the lathe is used to traverse the tool along the work to produce screw threads?