Online Calculators
Free tools to calculate speed, RPM and abrasive consumption. Optimize your work and ensure safety.
Abrasives Calculators
Cutting speed
Calculation of the linear velocity of the disc (m/s)
Maximum speed (RPM)
Calculation of max. revolutions by diameter and speed
Abrasive consumption
Calculation of the need for discs
Cost of cutting
How much does 1 meter of sawn timber cost?
Frequently asked questions
How to calculate the maximum speed (RPM) for an abrasive wheel?
Formula for calculating maximum speed:
RPM = (V x 60000) / (π x D)
Where V is the maximum speed of the wheel in m/s (indicated on the label), D is the diameter of the wheel in mm.
For example, for a 125 mm wheel with a max speed of 80 m/s: RPM = (80 x 60000) / (3.14159 x 125) = 12,223 rpm.
What is the linear velocity of a disc and how to calculate it?
Linear velocity (surface velocity) is the speed of motion of a point on the edge of a disc in m/s.
Formula: V = (π x D x RPM) / 60000
Where D is the diameter in mm, RPM is revolutions per minute.
For most different discs, the maximum speed is 80 m/s.
Why is it important not to exceed the maximum wheel speed?
Exceeding the maximum speed results in excessive centrifugal load on the wheel, which can cause its destruction.
This is dangerous for the operator's health and life. The wheel fragments fly away at great speed.
Always check that the speed of your tool does not exceed the value indicated on the dial.
How to choose the right wheel diameter for a grinder?
The diameter of the disc should match the size of the grinder:
115 mm and 125 mm - for small angle grinders (800-1400 W)
150 mm and 180 mm - for medium (1500-2000 W)
230 mm - for large (2000+ W)
Never install a wheel with a larger diameter than that specified for the tool - this is a safety hazard.
How to convert revolutions (RPM) to linear velocity (m/s)?
Use the formula: V (м/с) = (π x D x RPM) / 60000
For example, a 125 mm wheel at 11,000 rpm:
V = (3.14159 x 125 x 11000) / 60000 = 72 m/s
This value should not exceed the maximum speed indicated on the cruise control (usually 80 m/s).
How to calculate the monthly consumption of abrasive wheels?
Costs depend on the length of the cut, the material and the type of wheel.
Approximate: 1 disc 125x1.0 mm = 40-60 m of ordinary steel.
For stainless steel, the service life is 30% shorter, for aluminum, it is 50% longer.
The calculator on this page will help you accurately calculate the need for your production.
What is MRR (Material Removal Rate) and how to use it?
MRR is an indicator of the abrasive's productivity, which measures the volume of material removed per unit of time (cm³/min or mm³/s).
Depends on: pressure, feed rate, grain size and material.
A higher MRR means faster machining, but can affect surface quality and wheel wear.
What is the difference between discs of 80 m/s and 100 m/s?
Wheels marked 100 m/s have a reinforced design and can operate at higher speeds.
For 125 mm disc:
At 80 m/s — max. speed 12,223 rpm
At 100 m/s — max. revolutions 15,279 rpm
100 m/s discs are suitable for professional high-speed tools and provide additional strength.
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