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Review Label the Parts of the CNC Lathe. Chuck. Headstock. Cutting tool. Toolpost. http://image.made-in-china.com/2f0j00zZFTqvdREfoe/Hobby-Lover-Metal-Lathe-W10003M-.jpg. Bed. Tailstock. Centre. Handwheel. Saddle. Cross Slide. CNC Controller. Review Solution Parts of the CNC Lathe.

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  1. Review Label the Parts of the CNC Lathe Chuck Headstock Cutting tool Toolpost http://image.made-in-china.com/2f0j00zZFTqvdREfoe/Hobby-Lover-Metal-Lathe-W10003M-.jpg Bed Tailstock Centre Handwheel Saddle Cross Slide CNC Controller

  2. Review Solution Parts of the CNC Lathe http://image.made-in-china.com/2f0j00zZFTqvdREfoe/Hobby-Lover-Metal-Lathe-W10003M-.jpg Cutting tool Headstock Chuck Centre Tailstock Bed Toolpost Handwheel Cross Slide Saddle CNC Controller

  3. REVIEW - Lathe processesMatch the following words and images Parallel turning Grooving Drilling Boring Taper turning Threading Turning

  4. REVIEW - Lathe processessolution Threading Turning Boring Taper turning Grooving Parallel turning Drilling

  5. REVIEW – Lathe Cutting tools Match the lathe tools with the text explanation Drilling Boring

  6. REVIEW – Lathe cutting tools Solution Drilling Boring

  7. Review Rotational Speed Q1 Label the diagram correctly Rotational Speed Feed

  8. Review Q1 solution Rotational Speed Cutting Depth Feed

  9. Review Q2 From the table below what is the fastest surface speed recommended to turn aluminium ? 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

  10. 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

  11. 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

  12. Review Find the two coordinates for each point indicated in the drawing below. Answers 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

  13. Review Exercise 2 Move the descriptions to the correct codes below. : • CODES • G00: • G01: • G02: • G03: • M2: • F: Arc motion Counter Clock Wise • End Program • Set Feed Rate Straight feed motion Arc motion Clock wise Straight rapid motion

  14. Review Exercise 2 - Solution Move the descriptions to the correct codes below. : • CODES • G00: • G01: • G02: • G03: • M2: • F: Straight rapid motion Straight feed motion Arc motion Clock wise Arc motion Counter Clock Wise • End Program • Set Feed Rate

  15. Review 1 - Safety • The machines are supplied with _______tools . Handle these with caution to avoid ________. • Always make sure that the tool and the workpiece are properly secured. The __________ can fly out of the chuck whenbeing machined • Wear eye protection,(_________) , when operating the machine. • Never _________the revolving workpiece with any part of your body. • Keep _________ and _________ away from moving parts • Keep working place _______and tidy. • Make sure the___________of machine parts is done correctly. • Goggles Chuck • Injury Assembly • Touch • Clean • Sharp • Hair • Clothing • Tidy • Workpiece

  16. Review 1 – Safety Answers • The machines are supplied with sharp tools . Handle these with caution to avoid injury. • Always make sure that the tool and the workpiece are each properly secured. The workpiece can fly out of the chuck whenbeing machined • Wear Eye protection,(Goggles), when operating the machine. • Never touch the revolving workpiece with any part of your body. • Keep hair and clothing away from moving parts • Keep working place Clean and tidy. • Make sure the assembly of machine parts is done correctly.

  17. 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 The process of using a machine to cut a flat face on a part Threading 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 slide Feedrate This is the speed of the movement of the saddle or cross slide

  18. Glossary of Terms (cont) • Chapter 3 • Machine 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 4 • G&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 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 This is a way of testing a program on a computer screen to see if it works • before you make it • Chapter 6 • Assemble To put together • Disassemble To take apart

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