Lathe Knurling, Grooving and Parting-Off | Machinist Level 1

A machinist must produce a gripping pattern, a retaining-ring groove and a separated blank on a small shaft. Each feature looks simple, yet it imposes different loads and inspection requirements. A rough pattern can conceal double tracking, a groove can be correctly wide but incorrectly located, and a parting tool can become trapped as the part separates. This lesson connects original geometry examples with process selection, secure support and evidence of acceptable results. It is an editorial national extension, not an invented British Columbia learning task or authorization to operate an unfamiliar lathe. Moving diagrams, worked examples and separate practice answers for Machinist learners. WHAT YOU WILL LEARN • Distinguish form and cut knurling, specify pattern conventions, and explain suitable tooling and support. • Calculate original repeat, growth, stiffness, speed and feed examples with explicit model and unit limits. • Interpret grooving and parting dimensions, tool references, contact conditions, support and safe recovery. • Diagnose defects and verify pattern, size, location, surface condition and traceable acceptance. CHAPTERS 0:00 Three small lathe features can create large process problems 0:44 Begin with the finished feature and the machining route 4:28 Worked repeat geometry: calculate a model diameter 5:11 Use a noninteger result to investigate, not to prescribe a cure 5:55 Diameter growth is not tool penetration 7:20 Unsupported length can dominate the deflection problem 8:47 Diagnose double tracking, galling and flaking separately 10:58 Worked groove depth: separate radius from diameter 11:39 Worked groove location: identify both walls 15:04 Worked part length: define the cutting-edge reference 15:46 A diameter change changes surface speed at fixed revolutions 16:26 Constant surface speed requires a verified spindle limit 17:09 Keep feed per revolution separate from feed per minute 20:39 Practice: solve a new groove and stock-use case 21:36 Answer: keep each dimension tied to its actual feature 22:20 Record enough information to repeat the accepted result 23:05 Check the distinctions that prevent plausible wrong answers 23:46 Produce the feature through a controlled complete process HOW TO STUDY Watch the mechanism. Explain the example aloud. Pause for practice. Recall the answers tomorrow. Next: revisit the Level 1 practice cases without notes. SOURCES AND SCOPE Mapped Machinist curriculum RSOS E-13.07, E-13.10, PDF pages 109–115. Original teaching. Mapped coverage does not by itself establish certification equivalence. Complete references and detailed source notes are in the companion course file source-notes.txt. USEFUL LINKS Technology of Machine Tools9th edition, copyright2024: Machinery's Handbook30th edition,2016: Machinist RSOS2018 currently linked: https://red-seal.ca/_conf/assets/cust... CCOHS Metalworking machines lathes: https://www.ccohs.ca/oshanswers/safet... Hommel+Keller cut knurling: https://www.hommel-keller.de/en/produ... Hommel+Keller form knurling: https://www.hommel-keller.de/en/produ... Sandvik Coromant parting and grooving tool setup: https://www.sandvik.coromant.com/en-g... Sandvik Coromant parting off: https://www.sandvik.coromant.com/en-u... Dorian Tool knurling catalogue, hosted2022: https://www.doriantool.com/wp-content... Study principles. Plant work follows current law, applicable codes, manufacturer instructions, approved procedures and qualified supervision. Independent study material; no certification or institutional endorsement is implied. #Machinist #Knurling #FormKnurling #Machining #MachineShop #Metalworking #Manufacturing #SkilledTrades #Apprenticeship #TradeSchool #MachinistTraining #RedSealMachinist #CutKnurling #Grooving #PartingOff #MetalLathe #LatheTools #KnurlPitch #GrooveDepth #GrooveWidth #CentreHeight #ChipControl #FeedPerRevolution #SurfaceSpeed #LatheInspection