This page now isolates one exact kinematic identity: how declared wheel diameter and spindle speed determine rim speed. It removes universal target bands, burst margins, cut-time promises and field instructions; the actual wheel label and machine manual govern use.
Declared Abrasive-Wheel Rim-Speed Comparison
Compare three declared wheel diameters at one declared spindle speed. The results are arithmetic only and are not allowable-speed, wheel-selection or operating recommendations.
Equation Used
- Each entered diameter is an independent declaration rather than a universal fresh, mid-life or discard size.
- All three comparisons use the same declared spindle speed.
- The identity reports ideal tangential rim speed only.
- The rotating-wheel drawing is schematic and does not reproduce a guard, clamp, feed or rail-cutting procedure.
- Allowable wheel speed must be read from the actual wheel marking and checked against the actual machine documentation.
- Wheel selection, condition, mounting, guarding, inspection, feed, cut time, rail stress, operation and safety are excluded.
Retains exact rim-speed arithmetic while removing universal target, burst, performance, operating and field-service claims.
A rail saw constrains a rotating wheel relative to the rail
The limited schematic shows rotating wheels only to make the diameter-and-speed relationship visible. It does not reproduce a complete rail-saw clamp, guard, feed or cutting procedure.
Machine-specific topology, permitted wheel sizes and rated spindle speed belong to the manufacturer's manual.
Use this only as a kinematic comparison
The worksheet compares how three declared diameters change tangential rim speed at a common declared RPM.
It cannot select a wheel, approve a machine setup, predict cut time or guide field work.
Exact circumference and rim-speed identities
OSHA defines surface speed from wheel circumference and RPM. The result is a speed, not an allowable rating.
A transparent arithmetic example
At N=5200 rpm, declared diameters 400, 360 and 320 mm give rim speeds 108.9, 98.0 and 87.1 m/s respectively. Those numbers must not be compared with an invented universal target; use the actual wheel marking and machine manual.
Kinematics do not establish suitability
OSHA requires checking spindle speed against the maximum operating speed marked on the wheel. A Stanley RS25 manual likewise gives model-specific wheel dimensions and speed requirements, while Norton publishes size-specific maximum RPM data.
The former universal glazing bands, burst margins, cut times, field diagnosis and operating advice are removed.
Wheel-speed ledger questions
Does the calculator say a wheel is safe?
No.
Does it predict cutting performance?
No.
Why compare three diameters?
Only to show the exact proportional relationship between diameter and rim speed.
Where do allowable values come from?
From the actual wheel marking and applicable machine documentation.
Abrasive-wheel and rail-saw references
- OSHA 1910.211: surface-speed definition and circumference-times-RPM formula.
- OSHA 1910.215: spindle-speed check against the maximum operating speed marked on the wheel.
- Stanley RS25 Rail Saw User Manual: model-specific wheel size and RPM limits.
- Norton RailCut product data: size-specific wheel dimensions and maximum operating speed.
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