74 Questions
What is the main function of a lathe machine?
Producing chips from the cutting tool
Who is credited with designing the first screw cutting lathe?
Henry Maudslay
What type of cutting tool is generally used with lathes?
Single point cutting tool
Which classification of lathes occupies less floor space?
Vertical lathes
What distinguishes general-purpose lathes from single-purpose lathes?
Type of operations carried out
In what year did Henry Maudslay design the first screw cutting lathe?
1797
What type of lathe is used for extremely small size jobs and precision work?
Swiss type automatic lathe
Which type of jobs are typically held in collets in a lathe?
Slender rod like jobs
What part of a center lathe holds the spindle and transmits power and rotation to the job?
Headstock
In a lathe, what is the function of the tailstock?
Supporting longer blanks
Which part of a lathe is used for giving various movements to the tool by hand and by power?
Saddle
What is the purpose of the cross-slide on a lathe?
Setting the tool for angular cuts during taper turning
What is the main function of the compound rest on a lathe?
Setting the tool for angular cuts during taper turning
What is mounted on top of the saddle on a lathe?
Cross-slide
What moves alone to guide ways on a lathe?
Saddle
What carries the spindle and transmits power and rotation to the job in a center lathe?
Headstock
What is the purpose of the back gears in a lathe machine?
To change spindle speeds indirectly
How are different spindle speeds obtained in an all geared headstock lathe?
By shifting levers to change gear combinations
What is a key function of the feed mechanism in a lathe machine?
To transmit power from the spindle to the carriage
In a lathe machine, what is the primary advantage of using an all geared headstock over a cone pulley mechanism?
Eliminates belt shifting
When are back gears typically engaged in a lathe machine?
For obtaining direct speeds
Which statement best describes how an all geared headstock lathe operates?
It has gears that can be moved axially to mesh with each other.
What advantage does using back gears in a lathe machine provide?
Constant tool power
Which component is responsible for converting rotary motion into linear motion in a lathe machine?
Feed mechanism
In what scenario would you engage the back gears in a lathe machine by using lever L?
When you want to reduce spindle speed.
Why is an all geared headstock preferred over a cone pulley mechanism in modern lathes?
It eliminates belt shifting.
What is the purpose of the quick-change gear box in the lathe?
To provide various power feeds in the lathe
How many different speeds can Shaft C receive in the quick-change gearbox setup?
36
In the tumbler gear quick-change gear box, what is connected to the lead screw or feed rod?
The driven shaft
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
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
What is used for thread cutting in the lathe setup?
Lead screw
How are various speeds obtained in the tumbler gear quick-change gear box?
By sliding the sliding gear and engaging the tumbler gear
What connects Shaft C to the lead screw in the quick-change gearbox setup?
A clutch
What is attached with worm wheel in the apron mechanism of the lathe?
A splined shaft
How many different sizes of gears are keyed with Shaft A in the quick-change gearbox?
9
How is automatic longitudinal feed achieved on a lathe machine?
By engaging rotating gear G with gear H
What mechanism is used to reverse both longitudinal and cross feed on a lathe machine?
Clutch operated bevel gear reversing mechanism
In a modern heavy-duty lathe, what mechanism replaces the non-rigid tumbler gear mechanism for feed reversing?
Bevel gear feed reversing mechanism
What type of chuck is commonly used for holding non-circular bars in a centre lathe?
4-jaw independent chuck
Which device is best suited for holding work pieces that cannot be conveniently held between centres or by chucks?
Face plate
What provides the necessary rigidity in construction for the bevel gear feed reversing mechanism in a lathe?
Clutch operated bevel gear reversing mechanism
How are jaws moved radially in a 4-jaw independent chuck?
By rotating the corresponding screws which push the rack provided on each jaw
What is the purpose of an angle plate in a lathe setup?
Holding work pieces at right angles to each other
Which mechanism replaces the tumbler gear mechanism for feed reversing in a modern heavy-duty lathe?
Bevel gear feed reversing mechanism
When is a face plate typically used in a lathe setup?
For work pieces that cannot be held by chucks or between centres
What is the purpose of using an angle plate along with the face plate?
To hold and rotate eccentric or unsymmetrical jobs
What is the function of a catch plate or driving plate?
To drive the work piece through a carrier or dog
Why are mandrels made of high carbon steel?
To avoid distortion and wear
When is a revolving centre preferably used?
When desired to avoid sliding friction between job and centre
What is the purpose of using a steady rest or follower rest?
To prevent sagging of slender rods during machining
What type of centre has a ball-shaped end to minimize wear and strain?
Ball centre
'Tipped centre' has what feature to make it highly wear-resistant?
Brazed hard alloy tip
'Insert type centre' allows for replacing what component instead of the whole centre?
'Steel 'insert''
'Pipe centre' is specifically used for supporting which types of objects?
Hollow work pieces
Which additional support helps prevent deflection of long slender jobs due to sagging during machining?
Steady rest
What is the main reason for using a tipped tool brazed to the carbon steel shank?
Flexibility in tool shape
Why are ceramic tips clamped to the end of a shank instead of being brazed on?
To ensure rigidity
What distinguishes solid tools from tools inserted in a holder?
Method of attachment to the lathe
What is the benefit of using high-speed steel in tipped tools?
Higher resistance to wear
Why are ceramic inserts clamped in rectangular sectioned steel bars?
To ensure stability during cutting operations
What is the primary reason for using carbide inserts in tool holders?
Resistance to wear
In what situation would a mechanic fastened tipped tool be preferred over a brazed tip tool?
When rigidity is required
Why are high-speed steel tips sometimes brazed onto a carbon steel shank?
To enhance durability of the tool tip
What benefit does mechanically clamping carbide inserts offer over ceramic inserts?
Increased stability during cutting
Why would a manufacturer choose forged tools over tipped tools?
When precision machining is not critical
What is the term for the lower part of the carriage attached to the saddle?
Saddle apron
How is the longitudinal feed achieved in a lathe?
By moving the compound slide
What is the function of the lead screw in a lathe?
To move the carriage or cross-slide for various operations
Which part of the lathe is used to traverse the tool along the work to produce screw threads?
Lead screw
What part of a lathe is responsible for deriving automatic feed motion from the rotation of the spindle?
Apron mechanism
When cutting screw threads, what is engaged with the rotating lead screw to move the carriage parallel to the lathe bed?
Half nuts
Which component in a lathe allows for varying the feed rate as needed for turning and threading operations?
Norton gear
What is used to shift the tailstock along the lathe bed when necessary?
Clamping bolt
Explore the history, functions, and applications of a centre lathe machine. Learn how this machine tool removes material from a workpiece to produce the required shape and size.
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