http://image.made-in-china.com/2f0j00zZFTqvdREfoe/Hobby-Lover-Metal-Lathe-W10003M-.jpg

Chuck

Tailstock

Cross Slide

Toolpost

Centre

Cutting tool

Saddle

Bed

Headstock

HandwheelReviewLabel the Parts of the CNC Lathe

CNC Controller

http://image.made-in-china.com/2f0j00zZFTqvdREfoe/Hobby-Lover-Metal-Lathe-W10003M-.jpg

Chuck

Tailstock

Cross SlideToolpost

Centre

Cutting tool

Saddle

Bed

Headstock

Handwheel

Review SolutionParts of the CNC Lathe

CNC Controller

REVIEW - Lathe processesMatch the following words and images

Parallel turning

Turning

Grooving Drilling BoringThreadingTaper turning

REVIEW - Lathe processessolution

Turning

Grooving

Drilling

BoringTaper turning

Parallel turning

Threading

REVIEW – Lathe Cutting toolsMatch the lathe tools with the text explanation

Boring Drilling

REVIEW – Lathe cutting toolsSolution

Drilling

Boring

ReviewRotational Speed

Rotational Speed

Feed

Q1 Label the diagram correctly

Review

Cutting Depth

Rotational Speed

Feed

Q1 solution

Material type Meters per min (MPM)

Steel (tough) 15–18Mild steel 30–38Cast iron (medium) 18–24Stainless steels 23-40Bronzes 24–45Aluminium 75–105Brass 90-210

ReviewQ2From the table below what is the fastest surface speed recommended to turn aluminium ?

Q2 Answer105 MPM

Q3 Calculate the rotational speed for a lathe (n) if the workpiece diameter =20mm and the cutting speed Vc = 30 m/min. (Steel)

Q 3 AnswerVc = 30m/min.d = 0.02 m (20mm)n = Vc/ π x d = 30 / (3.14x 0.02)

n= 478 RPM

Review

Rough Cuts Finish Cuts

Material mm / Rev mm / Rev

Mild steel 0.25–0.5 0.07–0.25

Cast iron 0.4–0.65 0.13–0.3

Bronze . 0.4–0.65 0.07–0.25

Aluminum 0.4–0.75 0.13–0.25

Q4From the table above, what feedrate should be chosen to remove aluminium as fast as you can?

Q4 Answer0.75 mm/Rev

Q5From the table above, what feedrate should be chosen to get the best finish in aluminium?

Q5 Answer0.13 mm/Rev

Review

Q6When roughing a bar of aluminium we want to reduce the diameter in a bar from 25mm to 23mm diameter in one cut. What is the depth of cut ?

Diameter reduction = 25 – 23 = 2mm

Depth of cut = 2mm / 2

Answer Q6Depth of Cut = 1mm

ReviewFind the two coordinates for each point indicated in the drawing below.

P1=

P2=

P3=

P4=

P5=

P6=

P7=

P8=

P9=

80

70

50

40

20

1030402440

Answers

P1=X0,Z0P2=X5,Z0P3=X15,Z-20P4=X15,Z-40P5=X20,Z-40P6=X20,Z-50P7=X12,Z-50P8=X12,Z-70P9=X-20,Z-70

Move the descriptions to the correct codes below. :Review Exercise 2

CODES

G00:

G01:

G02:

G03:

M2:

F:

Straight feed motion

Arc motion Clock wise

End Program

Set Feed Rate

Straight rapid motion

Arc motion Counter Clock Wise

Move the descriptions to the correct codes below. :Review Exercise 2 - Solution

CODES

G00:

G01:

G02:

G03:

M2:

F:

Straight feed motion

Arc motion Clock wise

End Program

Set Feed Rate

Straight rapid motion

Arc motion Counter Clock Wise

Review 1 - Safety

1. The machines are supplied with _______ tools . Handle these with caution to avoid ________.

2. Always make sure that the tool and the workpiece are properly secured. The __________ can fly out of the chuck when being machined

3. Wear eye protection,(_________) , when operating the machine.

4. Never _________the revolving workpiece with any part of your body.

5. Keep _________ and _________ away from moving parts

6. Keep working place _______ and tidy.

7. Make sure the___________of machine parts is done correctly.

Chuck Assembly Tidy

InjuryHair ClothingSharp

GogglesWorkpiece

TouchClean

1. The machines are supplied with sharp tools . Handle these with caution to avoid injury.

2. Always make sure that the tool and the workpiece are each properly secured. The workpiece can fly out of the chuck when being machined

3. Wear Eye protection,(Goggles), when operating the machine.

4. Never touch the revolving workpiece with any part of your body.

5. Keep hair and clothing away from moving parts

6. Keep working place Clean and tidy.

7. Make sure the assembly of machine parts is done correctly.

Review 1 – Safety Answers

Glossary of TermsChapter 1CAD Computer Aided Design (usually refers to 2D or 3D drawing systems like AutoCADCAM Computer Aided Manufacture (Systems that can control machines for making)CNC Computer Numerical Control (Machines controlled by computers)Lathe A machine used to cut round shapes. Milling Machine A machine used to flat surfaces and contours on metal parts.Turning The process of using a lathe Turned parts Any parts that have been made on a latheChuck Part of the lathe holds the workpiece Workpiece The material that is being cut to make something.Tailstock Part of the lathe opposite the chuck used for drilling operations and to

support long workpieces.Bed The machine bed is the main body of the lathe that everything is connected toSaddle This is the part of the machine lathe that moves along the bedCross slide This is the part of the lathe that moves across the bed.Toolpost Part of the lathe holding the cutting tool

Chapter 2Facing The process of using a machine to cut a flat face on a partThreading The process of making a screw thread on a part.Grooving (or recessing) The process of cutting a groove or step in a turned part.Brazed tips These are hard cutting tool tips that have been brazed onto a steel tool shank.Indexable tips These are cutting tool tips with 3 or more edges that can be used by turning them

around (indexing).Feed On the lathe this is the movement of the saddle or the cross slideFeedrate This is the speed of the movement of the saddle or cross slide

Glossary of Terms (cont)

Chapter 3Machine Zero This is the zero point on a CNC lathe that is fixed by the CNC controller and cannot be changed.Workpiece Zero This is the zero point on the centre of the front face of the workpiece that CNC lathe

programs normally work from. This is set by the operator of the machine.

Chapter 4G&M Codes These are the program codes that are used to control CNC machines.

N... This is the line number of the program (this code is not always needed)Gxx …. This describes the type of movement

(e.g. G00 means move rapidly in a straight line.)X, Y, Z …. These are the coordinates to move toF,S,T …. These make technical changes for the machine

(eg. To set the Feed rate, Speed, Tool etc.) M …. These are lines used to control the program (e.g motor on/off and so on.)

Chapter 5Simulation This is a way of testing a program on a computer screen to see if it works

before you make itChapter 6Assemble To put togetherDisassemble To take apart