Presentation on theme: "Learning objectives: -"— Presentation transcript:
1 Learning objectives: - Bigger picture: -Know about engineering processes used to produce modern engineered productsLearning objectives: -Be able to explain what is meant by the term secondary machiningDescribe a range of secondary machining techniquesSuccess criteria: -Provide a definition for different machining operationsCorrectly identify the sequence of machining for turning, milling and drilling.
2 TurningTurning involves the use of the lathe to produce a given shape, usually cylindrical.Lathes have one thing in common: the work piece is held in a chuck and rotated while being machined to shape and size using a cutting tool.
3 Lesson task 1: Look at the common machining operations for lathe work Match up the operation with the description:Operation:Facing offDrillingParallel turningTaper turningParting offDescription:A process used to cut off the work piece to the required lengthRemoving material from the outer diameter of the work piece while maintaining the same size along its lengthRemoving material from the end of a work piece to leave flat or square surfaceRemoving material from the inside of a work piece using a drill bitA process used to create a conical shape by feeding a tool at an angle to the length of the work piece
4 MillingMilling is a process used to shape products by removing excess material to produce a range of simple and complex shapes.A milling machine has a spindle that holds a rotating cutter in place. The work piece will be clamped to a table or held in a vice and fed under the cutter to form the desired shape.There are 2 main types of milling – horizontal and vertical.
5 Lesson task 2: Look at the common types of milling tools Match up the tool with the function:Operation:Face millsEnd millsSlot drillsSlitting sawsDescription:Discs with saw teeth around the perimeter designed for cutting deep thin slots into the work pieceA type of end mill designed to plunge into the work piece like a drill then be moved across to create a grooveCutter with multiple cutting tips – often called inserts – designed to move across the face of the work pieceThe most common tool used in milling, this has cutting teeth at one end and along the side
6 DrillingDrilling is a process that creates circular holes in a work piece.The cutting device is called a drill bit.It usually has a shank that allows it to be held in a drilling machine.To drill a satisfactory hole in any material, the correct type of drill bit must be used.This is probably the most common machining operation you will perform.Good quality drill bits can be expensive but the key to good drilling is keeping the cutting edge sharp.
7 Lesson task 3: Look at the common types of drilling tools Match up the tool with the correct picture:Tool:Centre drillTapCountersinkTwist drill
8 Drilling The drill bit is placed into the chuck The chuck is tightened with a chuck key and the guard is positionedThe work piece is clamped into a vice underneath the drill bitThe drill is switched onThe handle is slowly pulled downThe drill bit is gradually forced through the materialThe lever is raisedThe drill is switched offDrilling
9 The tool is located in the tool holding device , tool post or tail stock The work piece is secured in the chuck, face plate or work holding deviceCoolant if required is switched on and directed onto the work pieceSafety checks are undertaken, ensuring all guards are in placeThe tool is brought into contact with the work piece to produce the desired featuresThe tool is removed from the work piece and a safe procedure is followed to shut down the machineTurning
10 Milling The tool is located in the chuck The work piece is secured in the work holding deviceIf required coolant supply is switched on and directed onto the work pieceSafety checks are undertaken including guards in placeThe tool is brought into contact with the work piece to produce the desired featuresThe tool is removed from the work piece and a safe procedure is followed to shut down the machineMilling