Lesson 1Threading on a conventional lathe: single-point external threading technique, pitch engagement, thread profile checks, and thread length controlThis covers making threads with one point on a regular lathe, including tool setup, pitch start, feed ways, thread shape check, and controlling length and end for good, same results every time.
Thread form, pitch, and diameter terminologyTool geometry and insert selection for threadingSetting compound angle and infeed strategySynchronizing pitch with leadscrew and gearboxChecking thread profile with gauges and templatesControlling thread length, runout, and undercutsLesson 2Surface finish for bearing fits: achieving required Ra using finishing passes and tool geometryYou learn to get good surface finish for bearing seats on shafts by using right tool shape, cutting settings, and final passes, while stopping shakes, edge build-up, and tool wear in local conditions.
Surface roughness terms and Ra requirementsTool nose radius and rake for fine finishingLight finishing passes and spring cutsControlling chatter and workpiece deflectionCoolant use and chip control for fine finishVerifying finish with comparators and gaugesLesson 3Dimensional inspection methods on lathe parts: micrometers, calipers, dial indicators, and go/no-go gaugesExplore ways to check sizes on lathe parts with micrometers, calipers, dial gauges, and pass/fail tools to confirm diameters, lengths, wobble, and threads, and record against drawing needs.
Using calipers for quick checks and layoutOutside micrometers for precise diametersDial indicators for runout and alignmentGo/no-go plug and ring gauges for threadsRecording measurements and tolerancesHandling and caring for precision gaugesLesson 4Workholding methods: 3-jaw chuck, 4-jaw chuck, live center in tailstock, and driving dogs for shaft workStudy common ways to hold shafts, like 3-jaw and 4-jaw chucks, live centers, and dogs, learning to pick, set up, and check each for straight holding and safe grip.
Using a 3-jaw chuck for general shaft workIndicating and centering in a 4-jaw chuckSupporting long shafts with live centersDriving between centers with dogs and faceplatesReducing runout and deflection on slender shaftsSafety checks for clamping and overhangLesson 5Selecting raw round-bar size and calculating stock allowance for 30 mm to 20 mm stepped shaftThis explains picking raw bar size and extra stock for a 30 mm to 20 mm stepped shaft, thinking about straightness, clean-up, holding, and allowances for rough and final cuts.
Reviewing final shaft dimensions and featuresChoosing bar diameter above largest stepAllowing stock for roughing and finishing cutsConsidering straightness and material conditionLength allowance for facing and workholdingWorked example for 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 toolsDetails picking tools for each turning step on stepped shafts, like carbide and HSS, parting and threading tools, center drills, and shape tools, matching shape and type to material and job.
Choosing carbide versus HSS turning toolsNose radius and chipbreaker selectionSelecting and setting parting toolsChoosing threading tools and insertsCenter drills and twist drills for center holesForm and rounding tools for fillets and radiiLesson 7Sequence of turning operations: facing, center drilling, rough turning, finish turning, parting, threading, and chamferingExplains planning the order of turning steps for stepped shafts, from facing and center drilling to roughing, finishing, threading, edging, and cutting off, to cut down mistakes, bends, and re-dos.
Planning operation order from drawing requirementsFacing and establishing reference surfacesCenter drilling and supporting between centersRough turning diameters and shouldersFinish turning critical diameters and fitsChamfering, threading, and parting off safelyLesson 8Cutting parameters: spindle speeds (RPM), feed rates (mm/rev), depths of cut for rough and finish turning on medium carbon steelLearn to pick spindle speed, feed rate, and cut depth for roughing and finishing medium carbon steel, balancing tool life, finish, and speed while minding machine power and strength.
Relating cutting speed, RPM, and work diameterSelecting feeds for roughing and finishing passesChoosing depth of cut by rigidity and power limitsAdjusting parameters for tool wear and chatterEffect of coolant and lubrication on cutting dataUsing tables and catalogs to set starting valuesLesson 9Interpreting shaft dimensions, tolerances, and surface-finish requirementsTrains you to read shaft drawings, understand sizes, allowed errors, and finish marks, and link them to how the part works like bearing fits, steps, and thread hold on stepped shafts.
Linear and diameter dimensioning on shaftsLimit dimensions and fit designationsGeometric tolerances for runout and concentricitySurface-finish symbols and bearing seat needsRelating drawing data to machining strategyCommon mistakes when reading shaft drawings
