Beginner
SFM vs RPM: What's the Difference in Grinding?
RPM measures spindle speed. SFM measures peripheral wheel velocity. Only SFM tells you whether your grinding action is correct.
Read GuideGrinding Knowledge Base
Fundamentals, formulas, and practical guides for grinding wheel speed, material selection, and surface finish optimization.
Beginner
How to Calculate Grinding Wheel Speed (Step by Step)
The complete formula derivation for SFM, RPM, and wheel diameter — with worked examples for both Imperial and Metric units.
Read GuideIntermediate
How to Select the Right Grinding Wheel
Match abrasive type, grit size, grade, and structure to your workpiece material and operation type (roughing, finishing, creep feed).
Read GuideIntermediate
Understanding Ra Surface Finish in Grinding
How wheel grit, dressing frequency, feed rate, and speed interact to determine your achieved Ra roughness value.
Read GuideBeginner
Grinding Terms Glossary
Definitions of SFM, MPS, RPM, Ra, Rz, MRR, contact length, and other essential grinding terminology.
Read GuideNeed a Specific Calculation?
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