11 Chucks A chuck is one of the most important device for holding & rotating a workpiece in a lathe.The various types of chuck as followsThree jaw chuckFour jaw chuckDrill or collect chuckMagnetic chuck
16 2. Head stock Clamped on left-hand end of bed Headstock spindle Hollow cylindrical shaft supported by bearings_Provides drive through gears to work-holding devicesLive center, faceplate, or chuck fitted to spindle nose to hold and drive workDriven by stepped pulley or transmission gearsFeed reverse leverReverses rotation of feed rod and lead screw
20 Tail stock Located at right hand end of the lathe bed. It can be moved along the guide ways on the lathe bed & can be clamped in any position on the lathe bed.FunctionTo hold the dead centre which can support the long work pieces during machining &To hold the tools like drill, reamer & boring for carrying out operations like drilling, reaming & boring.
22 4. CarriageLocated between the headstock & tailstock of the lathe bed.It slides along the guide ways on the lathe bed.FunctionTo hold the cutting tool,To give longitudinal &/ or cross feed to the cutting tool.
23 Parts of carriage The carriage has five parts Saddle Cross slide Compound restTool postApron
26 5. Lead screwIt is along threaded shaft driven by the feed drive.FunctionIt is used for giving mechanized motion to the carriage for cutting threads on the work piece.The rotary motion of the lead screw is converted into linear motion of the split nut & the carriage.
33 Turning The tool used for this operation is called as turning tool. Turning is the process of removing material from the cylindrical surface of the work peace to reduced its diameter.The tool used for this operation is called as turning tool.
35 Straight turning are used to reduced the diameter of the work piece. The tool motion is longitudinal
36 2) Step turningWhen the work peace of different diameter turned the surface from one diameter of work peace is called as step turning.The tool used for this operation is called as turning tool.
37 Facing The facing operation used for reducing the length of the of a work piece.Tool – facing toolFeed – cross feed
38 ChamferingChamfering is the process of removing the sharp edges of the work peace.chamfering is provided toFor avoiding the injuries to the persons handling to the finished product.For aesthetic look to the finished product.
39 Grooving Tool – grooving tool Feed – cross feed Grooving is the process of producing / providing anarrow groove on the cylindrical surface of theWork peace .Tool – grooving toolFeed – cross feed
40 Parting Parting is the process of cutting the work peace in to two parts.Tool – parting toolFeed – cross feed
41 KnurlingKnurling is the process of embossing a diamond shaped regular pattern on the surface of work pieceKnurling operation performed for producingproper grip as compared to smooth surfaceTool – knurling toolFeed – longitudinal feed
42 DrillingDrilling is the process of producing a cylindrical hole in the work peace.Tool – drilling tool
43 BoringBoring is done to enlarge the already drilled hole & boring them to exact size. Tool – boring tool
44 ReamingReaming is a finishing operation because a very small amount of material is removed during operation.Tool -reaming tool