) : The difference between the actual and theoretical distance between adjacent teeth. Profile Deviation ( Fαcap F sub alpha
| Grade | Typical Application | Manufacturing Method | |-------|---------------------|----------------------| | 1–3 | Ultra-precision (gyroscopes, test masters) | Lapping, super-finishing | | 4–6 | High-speed, quiet gears (aerospace, racing transmissions) | Precision grinding | | 7–9 | General industrial (automotive, machine tools) | Hobbing, shaping, shaving | | 10–12 | Low-speed, high-tolerance (agriculture, hand tools) | Unfinished hobbing, casting | iso 1328 pdf
The heart of the is the table of tolerance grades. The system defines 12 accuracy grades, where Grade 1 is the most precise (used in measuring instruments and aerospace) and Grade 12 is the least precise (rough, low-speed machinery). ) : The difference between the actual and
(without full standard):
:
Using a pre-2020 PDF for Part 2 means you are likely accepting non-compliant gears. Always check the "Year of Publication" on the first page of your PDF. (without full standard): : Using a pre-2020 PDF