இலவச பொறியாள் கருவி
Shaft Radial Runout Calculator
Estimate the shaft radial runout (TIR — Total Indicator Reading) that corresponds to the ISO 21940-11 residual unbalance limit for your balance quality grade and speed, and screen measured runout for unbalance risk. Note: ISO 21940-11 sets unbalance limits — the geometric runout tolerance itself comes from the shaft drawing or manufacturer specification.
Results
Permissible Eccentricity
சமன்பாட்டு தர வகுப்பு G மற்றும் இயக்க வேகத்திலிருந்து:
- G — சமநிலை தரத்திரட (மிமी/வி)
- n — operating speed (RPM)
- ω — angular velocity (rad/s) = 2πn/60
Total Indicator Reading
டயல் குறிகாட்டியால் அளவிடப்படும் TIR, விலகு நிலையின் இரு மடங்காகும் (உச்சத்திலிருந்து உச்சம் வரை):
Scope of this check: eper in ISO 21940-11 is a permissible residual unbalance (mass-centre eccentricity), not a geometric runout tolerance. TIR = 2 × eper is therefore a screening value: if measured journal runout exceeds it, the mass-centre displacement from runout alone could already exceed the balance limit for the selected G grade. It does not replace the geometric runout tolerance on the shaft drawing, and a shaft with low TIR can still be out of balance (mass distribution), while measured TIR can include form error, bend, bearing seating or setup error that does not translate one-to-one into unbalance.
Equivalent Unbalance
நடைமுறை உதாரணம்
Given: Speed = 3000 RPM, Grade = G6.3, Mass = 45 kg, Diameter = 40 mm
ω = 2π × 3000 / 60 = 314.16 rad/s
eper = 6.3 × 1000 / 314.16 = 20.05 μm
TIR = 2 × 20.05 = 40.1 μm
Uper = 20.05 × 45 = 902.3 g·mm
Unbalance-Equivalent Runout Reference Table (screening values)
| Grade | Speed (RPM) | eper (μm) | Equivalent TIR (μm) |
|---|---|---|---|
| G6.3 | 750 | 80.2 | 160.4 |
| G6.3 | 1500 | 40.1 | 80.2 |
| G6.3 | 3000 | 20.1 | 40.1 |
| G2.5 | 3000 | 7.96 | 15.9 |
| G2.5 | 6000 | 3.98 | 7.96 |
| G1.0 | 6000 | 1.59 | 3.18 |
| G1.0 | 12000 | 0.80 | 1.59 |
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