Turning

Parts of a LatheHeadstock

Chuck

Toolpost

Tailstock

Saddle

Treadle StopFeedshaftLeadscrew

LatheBed

Turning

Parts of a LatheCross-slide Handwheel

Compound-slide Handwheel

Feed Reverse

Feed Direction

Saddle Handwheel

SpindleStart/Stop

Feed Start/StopEngage

Screwcutting

Spindle speed gear selection levers

High/LowGear Ratio

Selector

EmergencyStop

Button

Feedrate & Screwcutting Gear Selection Levers

SADDLE

HEADSTOCKFeedshaft/Leadscrew

Reverse

TurningLathe Tools

Side and Face cutter Knife Tool Roughing Tool

Forming Tool Parting Tool Screwcutting Chamfering Tool

TurningLathe Tool AnglesRake angle

Clearance angle

The tool must be set to centre height when clamped into the lathe tool-post otherwise the angles will change

TurningLathe Tool Angles

Tool correctly set on centre height

If the tool is set too high then ...

If the tool is set too low then ...

…..the rake gets bigger andthe clearance gets smaller

…..the rake gets smaller andthe clearance gets bigger

rake

clearance

TurningLathe Centres

Dead CentreHalf Centre

Live or Revolving Centre Headstock Centre

TurningTools used on a Lathe

Centre Drill Twist Drills

Thread Chasers

parallel shank

Taps and Dies

Machine Reamer

Knurling Tool

Morse taper shank

TurningWork HoldingThree Jaw Chuck

With 2 sets of jaws –

for holding different diameters of work

TurningWork HoldingCollet Chuck Has interchangeable collets for

different diameters

Will not distort thin walled jobs

Often used for production work

TurningWork HoldingFaceplate

Used for mounting jobs that cannot be held in a

chuck

Must be balanced before using

TurningWork HoldingFour Jaw Chuck

Jaws are reversible and independent

for centreing eccentric work

TurningSteadies

Long workpieces will deflect and spring if not supported.

To avoid this we use steadies – there are two types…

Bolted to the saddle so it travels along the work directly

behind the cutter and so prevents deflection due to the

cutting forces

Travelling Steady

TurningSteadies

Fixed to the bed to provide support when turning the end of long

workpieces.

Fixed Steady

TurningTaper Turning…

1) offsetting the tailstock…

…to produce slow tapers when turning between centres

TurningTaper Turning…

2) offsetting the compound slide…

…used for steeper angles

TurningTaper Turning…

…the cross-slide spindle is disengaged so that the taper turning attachment controls its movement

3) using a taper turning attachment…

TurningTaper Turning…

4) using a taper form tool…

Centre Lathe Use Name 6 main parts of a Centre Lathe.

A Lathe Tool has 2 main angles that form the cutting edge, Name them.

Name 6 tools that can be used on a Centre Lathe.

Name 3 kinds of tool holding used on a Centre Lathe.

Why is it important that a Lathe tool is set on centre height.

Turning a taper on a Centre Lathe can be achieved in four ways, What are They?

Reading a micrometer

A micrometer is used for making accuratemeasurements

Reading a micrometer

It can easily measure the thickness of a human hair…

…which is about four hundredths of a millimetre

0.04mm

Reading a micrometer

So how does it work?

It uses a screw thread

Each thread has its own pitch…

… this is the distance that the screw will move when turned through one revolution

Before going any further we need to know what the basic parts of a micrometer are called…..

Reading a micrometer

Reading a micrometer

The micrometer spindle has a thread

The pitch of this thread is 0.5mm

How far will the spindle move if it is turned through one revolution?

0.5mm

Reading a micrometer

When a micrometer is in the closed position…

…the scales are set so that they read zero.

Reading a micrometer

The top barrel scale is graduated in 0.5mmdivisions to record the number of full turns of the thimble

The bottom barrel scale is graduated in 1 mmdivisions

(2 full revolutions of the thimble)

Reading a micrometerIf the thimble is given one full turn from closed it will have moved how far?

This is shown as one small division on the barrel

0.5mm

Reading a micrometer

This is shown as one large division on the barrel

1 mm

If the thimble is given two full turns from closed it will have moved how far?

2 full turns of the thimble

Reading a micrometer

So 2 full turns (1mm) moves through 100 thimble divisions

The thimble scale is divided into 50

This means that each thimble division is one hundredth of a millimetre - 0.01 mm

Reading a micrometer

Reading the micrometer now is easy – simply add

the whole mm’s…

any half mm’s…

and the hundredths of a mm

10.00

0.50

0.06

10.56 mm

WELDINGBASIC INTRODUCTION TO WELDING

LEARNING AIM 1:TO DEVELOP A BASIC UNDERSTANDING OF 4 WELDING PROCESS

LEARNING AIM 2:UNDERSTAND SOME OF THE SAFETY REQUIREMENTS FOR WELDING

LEARNING OUTCOMES:

TO ACHIEVE A BASIC UNDERSTANDING OF WELDING PROCESSES AND SAFE WORKING PROCEDURES, THAT WILL SUPPORT YOUR START IN:

CITY AND GUILDS LEVEL 2 FABRICATION AND WELDING(UNIT 213 MMA, UNIT 214 MIG AND UNIT 215 TIG)

BTEC LEVEL 3 (UNIT 23 WELDING TECHNOLOGY)

ALL OF THE FOUR WELDING PROCESSES HAVE BENEFITS AND LIMITATIONS DEPENDING ON THE ENVIRONMENT OF WORK AND SKILL LEVEL OF THE PERSON WELDING.

THERE WILL BE A CHOICE OF PROCESS FOR PARTICULAR JOBS IN INDUSTRY. SOME PROCESSES ARE CAPABLE OF THE SAME WORK BUT MIGHT NOT BE AS PRODUCTIVE, OR USED MAINLY FOR WORK WITH SOME MATERIALS IN CERTAIN INDUSTRIES.

YOU WILL SEE THAT THERE IS QUITE A DIFFERENCE IN THE EQUIPMENT NEEDED AND CONSIDERATIONS FOR SAFETY WITH THE HAZARDS OF ELECTRICAL ARC WELDING.

CLICK ON THE LINK TO OPEN A VIDEO PRODUCED BY THE TWI (THE WELDING INSTITUTE) AS IT CONTAINS MOST OF THE DETAIL THAT YOU WILL NEED TO BE ABLE TO COMPLETE THE TASKS.

YOU WILL ALSO NEED TO USE RESEARCH ON BOTH HSE.GOV.UK AND TWI.COM TO ASSIST YOU WITH THE SAFETY QUESTIONS.

HTTPS://WWW.YOUTUBE.COM/WATCH?V=AQ-RIPIY-Y0

PLEASE DOWNLOAD THE YEAR 11 WELDING QUESTIONS DOCUMENT.

YOU CAN COMPLETE THIS DOCUMENT, WHICH YOU WILL NEED TO PRINT OUT AND BRING WITH YOU IN SEPTEMBER.

ALL TASK QUESTIONS ARE APPROPRIATE TO THE WELDING UNITS THAT WILL START IN SEPTEMBER SO USE THE GUIDANCE GIVEN AND FEEL FREE TO RESEARCH FROM OTHER SOURCES.

NOTE:WE ARE IN THE UK AND SOME RESOURCES MAY NOT BE ACCURATE FOR UK REGULATIONS AND LEGISLATION

Qualification Unit number and title

Preparation for:

City and Guilds Fabrication and Welding Level 2

Units: 213 MMA, 214 MIG and 215 TIG

Learner name Assessor name

W Hughes

Date issued Hand in deadline Submitted on

27th March 2020 4th September 2020

Please complete the following questions, based on the video in the presentation and

using research from the websites listed below.

You could add more detail to your answers if you research from other sources such as

TWI (The Welding Institute) and HSE.gov.uk (for welding fume guidance and COSHH

regulations).

This is ideal preparation for your upcoming units for both:

BTEC level 3 Unit 23 Welding Technology

City and Guilds Level 2 Fabrication and Welding

1. Which process requires less protection from ultraviolet light for anyone working in

the working area, and why?

2. What is the simplest process requiring less machinery and why does it not need a

separate shielding gas?

3. Which process is best suited to high production welding in all welding positions

and why?

4. Using research from hse.gov.uk and twi.com, how does welding fume need to be

controlled under COSHH regulations?

5. Why is submerged arc welding less suitable for multi-positional welding (not in

the flat (PA) or horizontal vertical (PB) positions?

Please add your name and submission date to the top of this document in the

appropriate box.