Review Label the Parts of the CNC Lathe Chuck Bed Saddle Headstock Cutting tool Toolpost Tailstock Centre Handwheel Cross Slide CNC Controller http://image.made-in- china.com/2f0j00zzftqvdrefoe/hobby-lover-metal-lathe- W10003M-.jpg
Review Solution Parts of the CNC Lathe Cutting tool Headstock Chuck Centre Bed Tailstock Toolpost Cross Slide Handwheel CNC Controller Saddle http://image.made-in- china.com/2f0j00zzftqvdrefoe/hobby-lover-metal-lathe- W10003M-.jpg
REVIEW - Lathe processes Match the following words and images Parallel turning Taper turning Threading Grooving Drilling Boring Turning
REVIEW - Lathe processes solution Taper turning Turning Threading Boring Parallel turning Drilling Grooving
REVIEW Lathe Cutting tools Match the lathe tools with the text explanation Boring Drilling
REVIEW Lathe cutting tools Solution Drilling Boring
Review Q1 Label the diagram correctly Rotational Speed Rotational Speed Feed
Review Q1 solution Rotational Speed Cutting Depth Feed
Review Q2 From the table below what is the fastest surface speed recommended to turn aluminium? Material type Meters per min (MPM) Steel (tough) 15 18 Mild steel 30 38 Cast iron (medium) 18 24 Stainless steels 23-40 Bronzes 24 45 Aluminium 75 105 Brass 90-210 Q2 Answer 105 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 Answer Vc = 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 Q4 From the table above, what feedrate should be chosen to remove aluminium as fast as you can? Q4 Answer 0.75 mm/rev Q5 From the table above, what feedrate should be chosen to get the best finish in aluminium? Q5 Answer 0.13 mm/rev
Review Q6 When 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 Q6 Depth of Cut = 1mm
Review Find the two coordinates for each point indicated in the drawing below. 80 70 50 Answers 40 24 40 30 40 20 P1= 10 P2= P1=X0,Z0 P2=X5,Z0 P3=X15,Z-20 P4=X15,Z-40 P5=X20,Z-40 P6=X20,Z-50 P7=X12,Z-50 P8=X12,Z-70 P9=X-20,Z-70 P6= P4= P9= P7= P5= P3= P8=
Review Exercise 2 Move the descriptions to the correct codes below. : CODES G00: G01: Arc motion Counter Clock Wise End Program G02: G03: M2: F: Set Feed Rate Straight feed motion Arc motion Clock wise Straight rapid motion
Review Exercise 2 - Solution Move the descriptions to the correct codes below. : CODES G00: Straight rapid motion G01: Straight feed motion G02: Arc motion Clock wise G03: Arc motion Counter Clock Wise M2: End Program F: Set Feed Rate
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. Goggles Clean Chuck Sharp Injury Hair Assembly Clothing Tidy Touch Workpiece
Review 1 Safety Answers 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.
Glossary of Terms Chapter 1 CAD Computer Aided Design (usually refers to 2D or 3D drawing systems like AutoCAD CAM 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 lathe Chuck 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 to Saddle This is the part of the machine lathe that moves along the bed Cross slide This is the part of the lathe that moves across the bed. Toolpost Part of the lathe holding the cutting tool Chapter 2 Facing Threading Grooving (or recessing) Brazed tips Indexable tips Feed Feedrate The process of using a machine to cut a flat face on a part The process of making a screw thread on a part. The process of cutting a groove or step in a turned part. These are hard cutting tool tips that have been brazed onto a steel tool shank. These are cutting tool tips with 3 or more edges that can be used by turning them around (indexing). On the lathe this is the movement of the saddle or the cross slide This is the speed of the movement of the saddle or cross slide
Glossary of Terms (cont) Chapter 3 Machine Zero Workpiece Zero Chapter 4 G&M Codes This is the zero point on a CNC lathe that is fixed by the CNC controller and cannot be changed. 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. 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 to F,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 5 Simulation Chapter 6 Assemble Disassemble This is a way of testing a program on a computer screen to see if it works before you make it To put together To take apart