Lesson 1Threading on a conventional lathe: single-point external threading technique, pitch engagement, thread profile checks, and thread length controlThis part addresses single-point external threading on a conventional lathe, covering tool setup, pitch engagement, infeed methods, thread profile checks, and managing thread length and runout for reliable, repeatable outcomes in workshop production.
Thread form, pitch, and diameter terminologyTool geometry and insert selection for threadingSetting compound angle and infeed strategySynchronising 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 geometryIn this section, you will discover how to attain bearing-quality surface finishes on shaft seats by using suitable tool geometry, cutting parameters, and finishing passes, while managing vibration, built-up edge, and tool wear effectively.
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 gaugesYou will investigate dimensional inspection methods for lathe parts, employing micrometers, calipers, dial indicators, and go/no-go gauges to confirm diameters, lengths, runout, and threads, and record findings against drawing specs.
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 workYou will examine common workholding methods for shaft work, such as 3-jaw and 4-jaw chucks, live centres, and driving dogs, learning to choose, install, and verify each to guarantee concentricity and firm clamping.
Using a 3-jaw chuck for general shaft workIndicating and centring in a 4-jaw chuckSupporting long shafts with live centresDriving between centres 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 part explains selecting raw bar size and calculating stock allowance for a 30 mm to 20 mm stepped shaft, factoring in straightness, cleanup, chucking, and allowances for roughing and finishing in practical scenarios.
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 toolsThis part specifies tool selection for each turning step on stepped shafts, including carbide and HSS tools, parting and threading tools, centre drills, and form tools, aligning geometry and grade to material and operation needs.
Choosing carbide versus HSS turning toolsNose radius and chipbreaker selectionSelecting and setting parting toolsChoosing threading tools and insertsCentre drills and twist drills for centre holesForm and rounding tools for fillets and radiiLesson 7Sequence of turning operations: facing, center drilling, rough turning, finish turning, parting, threading, and chamferingThis part describes planning the logical sequence of turning operations for stepped shafts, starting from facing and centre drilling to roughing, finishing, threading, chamfering, and parting, aiming to reduce errors, distortion, and rework.
Planning operation order from drawing requirementsFacing and establishing reference surfacesCentre drilling and supporting between centresRough 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 steelHere you will learn to select spindle speed, feed rate, and depth of cut for roughing and finishing medium carbon steel, balancing tool life, surface finish, and output while observing machine power and stability limits.
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 catalogues to set starting valuesLesson 9Interpreting shaft dimensions, tolerances, and surface-finish requirementsThis part teaches reading shaft drawings, interpreting dimensions, tolerances, and surface-finish symbols, and linking them to functional needs like bearing fits, shoulders, and thread engagement 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
