Spindle Vibration Check — Small Machines (ISO Class I)
Classify measured vibration velocity (mm/s RMS) for machines up to 15 kW against ISO 10816/20816 Class I zones.
Class I covers small integrated machines like bench-top spindles and sub-15 kW motors. Velocity RMS over 10–1,000 Hz is the standard health number; trend it monthly — the slope tells you more than the value.
Formula
Note: Condition-monitoring guidance, not a substitute for the machine maker's limits or a qualified vibration analyst on safety-critical equipment.
Classify measured vibration velocity (mm/s RMS) for machines up to 15 kW against ISO 10816/20816 Class I zones. A free cnc machining: speeds, feeds & tool wear tool — no sign-up, no upload, instant results in your browser.
About Spindle Vibration Check — Small Machines (ISO Class I)
Spindle Vibration Check — Small Machines (ISO Class I) computes the governing relationship Class I zone limits: A ≤ 0.71 · B ≤ 1.8 · C ≤ 4.5 mm/s RMS live as you type. Class I covers small integrated machines like bench-top spindles and sub-15 kW motors. Velocity RMS over 10–1,000 Hz is the standard health number; trend it monthly — the slope tells you more than the value. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Spindle Vibration Check — Small Machines (ISO Class I)
- 1Enter your values — Vibration velocity (RMS) (sensible defaults are pre-filled).
- 2Read the live results: Measured velocity.
- 3Check the "with your numbers" line to see Class I zone limits: A ≤ 0.71 · B ≤ 1.8 · C ≤ 4.5 mm/s RMS substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Spindle Vibration Check — Small Machines (ISO Class I)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula Class I zone limits: A ≤ 0.71 · B ≤ 1.8 · C ≤ 4.5 mm/s RMS with authoritative sources cited on the page (ISO 20816-1 (ex 10816) — Mechanical vibration evaluation; ISO 21940-11 — Rotor balancing; ISO 3685 — Tool-life testing with single-point turning tools)
- ✓Class I covers small integrated machines like bench-top spindles and sub-15 kW motors.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the spindle vibration check — small machines (iso class i) use?+
It evaluates Class I zone limits: A ≤ 0.71 · B ≤ 1.8 · C ≤ 4.5 mm/s RMS, exactly as published. Sources: ISO 20816-1 (ex 10816) — Mechanical vibration evaluation; ISO 21940-11 — Rotor balancing; ISO 3685 — Tool-life testing with single-point turning tools. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Class I covers small integrated machines like bench-top spindles and sub-15 kW motors. Condition-monitoring guidance, not a substitute for the machine maker's limits or a qualified vibration analyst on safety-critical equipment.
When is this calculator the right tool for the job?+
Classify measured vibration velocity (mm/s RMS) for machines up to 15 kW against ISO 10816/20816 Class I zones. A free cnc machining: speeds, feeds & tool wear tool. Velocity RMS over 10–1,000 Hz is the standard health number; trend it monthly — the slope tells you more than the value. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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