Lesson 1Operation sequence planning: facing, center drilling, rough turning, step turning for shoulders, finishing passes and final length controlDescribes planning full turning steps, from facing and center drilling through roughing, step turning, finishing, and end length control. Stresses less setups and keeping base points for true work.
Defining primary datums firstTypical order of turning operationsCombining cuts to reduce setupsLeaving stock for finishing passesFinal checks before part removalLesson 2Detailed steps to turn 40 mm bar to 35 mm shoulder and to 30 mm reduced end, including order and datum selectionGives clear steps to turn 40 mm bar to 35 mm shoulder and 30 mm thin end. Stresses base choice, cut order, tool swaps, and measure points to keep roundness and shoulder true.
Selecting datum face and diameterRough turning to near 35 mmTurning the 30 mm reduced sectionBlending shoulder and fillet radiusFinal finishing and inspection stepsLesson 3Roughing parameters for medium carbon steel: recommended cutting speed, feed and depth of cut (typical values and reference sources)Sets roughing settings for medium carbon steel, with usual cut speeds, feeds, and cut depths. Shows using book data, machine power limits, and strength to pick safe, good roughing setups.
Typical roughing speed rangesSelecting feed for stock removalDepth of cut versus horsepowerUsing manufacturer data tablesBalancing tool life and removal rateLesson 4Chip control, coolant selection and application for medium carbon steelDetails chip control and coolant ways for medium carbon steel. Explains chip breaker use, feed and depth on chip shape, coolant types and mix, and right nozzle place for safe, steady turning.
Chipbreaker selection and setupAdjusting feed for chip breakingCoolant types and mix ratiosNozzle positioning on manual lathesDry cutting versus flood coolant useLesson 5Finishing parameters for medium carbon steel: target cutting speeds, lower depths/feeds for Ra 1.6 µm and reference sourcesSets finishing settings for medium carbon steel, with usual cut speeds, feeds, and cut depths for Ra 1.6 µm. Explains balancing tool life and surface smooth, using book and standard data.
Typical finishing cutting speed rangesFeed and depth for Ra 1.6 µm surfacesEffect of machine rigidity on finishUsing toolmaker catalogs and ISO dataAdjusting parameters from trial cutsLesson 6Facing and length control techniques: use of stop collars, parting-off allowance, and end-face tolerance managementCovers facing and length hold on lathe, with stop collars, soft jaws, and parting extras. Explains flat, square faces and keeping end-face limits over many same parts.
Facing tool geometry and setupUsing stops and collars for lengthAllowances before parting-offChecking face flatness and squarenessControlling length on repeated partsLesson 7Center drilling and use of centers: sizes, depths, and when to use tailstock supportExplains center drilling and center use for support. Covers drill sizes, depths, right center shapes, oil, and tailstock support to stop bend and better size true.
Types and sizes of center drillsCorrect center drilling depthLive versus dead center selectionLubrication of centers and tipsWhen to support long slender workLesson 8Parting-off best practices and preventing chatter or plunging errorsGives best ways for parting medium carbon steel, on tool pick, blade reach, and feed hold. Explains stopping chatter, tool break, and plunge faults by setup and setting choice.
Choosing parting blade widthSetting blade height and overhangFeeds and speeds for parting steelReducing chatter and squealAvoiding tool jamming at breakthroughLesson 9Tool setup and offsets: tool height, lead angles, toolpath thinking for manual and CNC lathesExplains tool setup and shifts for hand and CNC lathes, with tool height, lead angles, and path plan. Shows avoiding rub, chatter, and crashes by right shift and test cuts.
Setting tool height on centerlineLead angle and approach directionEntering and checking CNC offsetsTrial cuts and wear offset updatesPlanning safe approach and retractLesson 10Tool selection: turning inserts (grades/coatings), tool nose radius, HSS vs carbide choices and why for each operationExplains picking turning inserts and tool stuff for medium carbon steel. Compares HSS and carbide, grades and coats, and nose round and shape on smooth, chip hold, and tool life per task.
ISO insert shapes and chipbreakersCarbide grades for medium carbon steelWhen HSS tools are still appropriateChoosing tool nose radius by operationCoating selection for dry and wet cutsLesson 11Dimensional checks between lathe operations: where and when to measure to maintain tolerancesCovers when and where to measure parts between lathe tasks to hold size limits. Talks tools like micrometers and calipers, heat effects, and ways for mid-checks and end check.
Selecting micrometers and calipersMeasuring diameters near shouldersControlling length and face squarenessCompensating for thermal expansionRecording and reacting to measurement dataLesson 12Chamfering procedure: tool geometry, single-pass vs multi-pass chamfers and inspectionDescribes right chamfer steps on lathe, with tool shape, approach angles, and one-pass vs many-pass. Explains setting chamfer size, no burrs, and true check.
Chamfer tool geometry and anglesProgramming chamfers on CNC lathesSingle-pass versus multi-pass chamfersMeasuring chamfer width and angleDeburring and edge quality checks
