The standard divides parts based on their intended function and precision requirements:
For general lengths, the allowed error (plus or minus) depends on the size of the part: ±0.1 mm 30 to 120 mm: ±0.3 mm 400 to 1000 mm: ±0.8 mm. 2. "k" (Geometrical) Tolerance Examples This covers how "straight" or "square" a part must be: jis b 0419-mk
| Mistake | Consequence | Solution | |---------|-------------|----------| | Using an ISO comparator for a JIS callout | Visual mismatch – part rejected | Purchase JIS-specific set | | Comparing turned surface to milled standard | Wrong tool mark pattern | Use correct machining method plate | | Oil or coolant on reference surface | Falsely smoother appearance | Clean with alcohol before use | | Uneven lighting | Hides fine marks or creates false shadows | Use standard illuminator or fixed desk lamp | | Operator fatigue | Inconsistent judgment | Rotate inspectors or use go/no-go reference | The standard divides parts based on their intended
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