Lesson 1Threading on a conventional lathe: single-point external threading technique, pitch engagement, thread profile checks, and thread length controlDis section cover single-point external threading pon a conventional lathe, including tool setup, pitch engagement, infeed methods, thread profile verification, an control of thread length an runout fi accurate, repeatable results.
Thread form, pitch, an diameter terminologyTool geometry an insert selection fi threadingSetting compound angle an infeed strategySynchronizing pitch wid leadscrew an gearboxChecking thread profile wid gauges an templatesControlling thread length, runout, an undercutsLesson 2Surface finish for bearing fits: achieving required Ra using finishing passes and tool geometryHere yuh will learn how fi achieve bearing-quality surface finishes pon shaft seats by combining proper tool geometry, cutting parameters, an finishing passes, while controlling vibration, built-up edge, an tool wear.
Surface roughness terms an Ra requirementsTool nose radius an rake fi fine finishingLight finishing passes an spring cutsControlling chatter an workpiece deflectionCoolant use an chip control fi fine finishVerifying finish wid comparators an gaugesLesson 3Dimensional inspection methods on lathe parts: micrometers, calipers, dial indicators, and go/no-go gaugesYuh will explore dimensional inspection methods fi lathe parts, using micrometers, calipers, dial indicators, an go/no-go gauges to verify diameters, lengths, runout, an threads, an to document results against drawing requirements.
Using calipers fi quick checks an layoutOutside micrometers fi precise diametersDial indicators fi runout an alignmentGo/no-go plug an ring gauges fi threadsRecording measurements an tolerancesHandling an caring fi precision gaugesLesson 4Workholding methods: 3-jaw chuck, 4-jaw chuck, live center in tailstock, and driving dogs for shaft workYuh will study common workholding methods fi shaft work, including 3-jaw an 4-jaw chucks, live centers, an driving dogs, learning how fi select, set up, an verify each method to ensure concentricity an secure clamping.
Using a 3-jaw chuck fi general shaft workIndicating an centering inna a 4-jaw chuckSupporting long shafts wid live centersDriving between centers wid dogs an faceplatesReducing runout an deflection pon slender shaftsSafety checks fi clamping an overhangLesson 5Selecting raw round-bar size and calculating stock allowance for 30 mm to 20 mm stepped shaftDis section explain how fi select raw bar size an calculate stock allowance fi a 30 mm to 20 mm stepped shaft, considering straightness, cleanup, chucking, an machining allowances fi roughing an finishing operations.
Reviewing final shaft dimensions an featuresChoosing bar diameter above largest stepAllowing stock fi roughing an finishing cutsConsidering straightness an material conditionLength allowance fi facing an workholdingWorked example fi 30–20 mm stepped shaftLesson 6Tool selection for each turning step: carbide/ HSS turning tools, parting tools, threading tools, drill bits for center holes, and form/rounding toolsDis section detail how fi select tools fi each turning step pon stepped shafts, including carbide an HSS tools, parting an threading tools, center drills, an form tools, matching geometry an grade to material an operation.
Choosing carbide versus HSS turning toolsNose radius an chipbreaker selectionSelecting an setting parting toolsChoosing threading tools an insertsCenter drills an twist drills fi center holesForm an rounding tools fi fillets an radiiLesson 7Sequence of turning operations: facing, center drilling, rough turning, finish turning, parting, threading, and chamferingDis section explain how fi plan di logical sequence of turning operations fi stepped shafts, from facing an center drilling through roughing, finishing, threading, chamfering, an parting, to minimize errors, distortion, an rework.
Planning operation order from drawing requirementsFacing an establishing reference surfacesCenter drilling an supporting between centersRough turning diameters an shouldersFinish turning critical diameters an fitsChamfering, threading, an parting off safelyLesson 8Cutting parameters: spindle speeds (RPM), feed rates (mm/rev), depths of cut for rough and finish turning on medium carbon steelHere yuh will learn how fi choose spindle speed, feed rate, an depth of cut fi roughing an finishing medium carbon steel, balancing tool life, surface finish, an productivity while respecting machine power an rigidity limits.
Relating cutting speed, RPM, an work diameterSelecting feeds fi roughing an finishing passesChoosing depth of cut by rigidity an power limitsAdjusting parameters fi tool wear an chatterEffect of coolant an lubrication pon cutting dataUsing tables an catalogs to set starting valuesLesson 9Interpreting shaft dimensions, tolerances, and surface-finish requirementsDis section train yuh fi read shaft drawings, interpret dimensions, tolerances, an surface-finish symbols, an relate dem to functional requirements such as bearing fits, shoulders, an thread engagement pon stepped shafts.
Linear an diameter dimensioning pon shaftsLimit dimensions an fit designationsGeometric tolerances fi runout an concentricitySurface-finish symbols an bearing seat needsRelating drawing data to machining strategyCommon mistakes when reading shaft drawings
