A finer abrasive size and a harder retaining bond describe different changes.
Identify the specification fields
Norton distinguishes grit-size designation from wheel grade, which concerns the bond’s relative holding power for abrasive grains. These are different specification fields. Primary reference: Norton technical explanation.
Read fictional specification revisions
Imagine a teaching record with separate columns for abrasive size, grade, bond and structure. Revision A changes only its size designation from 46 to 60 while retaining the declared grade. Revision B retains size 46 but changes the grade designation.
A report calling both revisions a finer wheel hides the difference. No physical grain diameter or universal numerical bond strength follows from these labels alone. The record intentionally names no selected product, material or wheel size and copies no manufacturer specification row.
Keep comparison fields independent
Ask which field was changed and how the actual manufacturer defines it. Preserve the complete wheel designation rather than retaining only one familiar number. Keep structure and bond identity with any grade comparison; different systems may not be comparable by a single letter.
Use the separated fields to request relevant actual grinding evidence. The worksheet does not choose a hard or soft grade, predict a surface finish or give a safe operating speed. Its practical purpose is to prevent a specification change in grain retention from being mistaken for a change in abrasive particle size before a supplier comparison is evaluated.
Customer Questions
Does grade identify grit size?
It concerns relative grain retention.
What changes in fictional revision A?
Only the size-designation field.
Do labels alone predict finish?
Actual process evidence remains necessary.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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