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BreakingChips

Apprentice corner

Short lessons on the basics every machinist leans on, each a few minutes long and ending in a quiz. The answers come from the same math as the calculators. Your scores stay on this device.

  1. Lesson 1 · 6 minSpeeds and feedsCutting speed, RPM, feed per rev and chip load: what each one is, and what each one changes.
  2. Lesson 2 · 5 minReading an insert codeWhat each letter and number in CNMG 432 or CNMG 120408 means, and why the shape matters.
  3. Lesson 3 · 6 minThreads and tap drillsTPI and pitch, picking a tap drill by percent of thread, and the feed for rigid tapping.
  4. Lesson 4 · 6 minTolerances and fitsReading a tolerance on a print, limits, and what H7/g6 or H7/p6 means for how parts go together.
  5. Lesson 5 · 6 minKnurling that tracksWhy a knurl double tracks, how to find the diameter that doesn’t, and how form and cut knurling differ.