GRINDING WHEELS 1297 Table 5. Grinding Wheel Recommendations for Constructional Steels (Soft) Grinding Operation Wheel or Rim Diameter, Inches First Choice Alternate Choice (Porous type) All-Around Wheel Surfacing Straight wheels 14 and smaller Wet FA46-J8V FA46-H12VP FA46-J8V 14 and smaller Dry FA46-I8V FA46-H12VP FA46-I8V Over 14 Wet FA36-J8V FA36-H12VP FA36-J8V Segments 1 1 ∕ 2 rim or Wet FA24-H8V FA30-F12VP FA24-H8V less Cylinders 1 1 ∕ 2 rim or Wet FA24-I8V FA30-G12VP FA24-H8V less Cups 3 ∕ 4 rim or less Wet FA24-H8V FA30-F12VP FA30-H8V (for wider rims, go one grade softer) Cylindrical 14 and smaller Wet SFA60-M5V … SFA60-L5V 16 and larger Wet SFA54-M5V … SFA54-L5V Centerless … Wet SFA54-N5V … SFA60-M5V Internal Under 1 ∕ 2 Wet SFA60-M5V … SFA80-L6V 1 ∕ 2 to 1 Wet SFA60-L5V … SFA60-K5V Over 1 to 3 Wet SFA54-K5V … SFA54-J5V Over 3 Wet SFA46-K5V … SFA46-J5V Table 6. Grinding Wheel Recommendations for Constructional Steels (Hardened or Carburized) Grinding Operation Wheel or Rim Diameter, Inches First Choice Alternate Choice (Porous Type) Surfacing Straight wheels 14 and smaller Wet FA46-I8V FA46-G12VP 14 and smaller Dry FA46-H8V FA46-F12VP Over 14 Wet FA36-I8V FA36-G12VP Segments or Cylinders 1 1 ∕ 2 rim or less Wet FA30-H8V FA36-F12VP Cups 3 ∕ 4 rim or less Wet FA36-H8V FA46-F12VP (for wider rims, go one grade softer) Forms and Radius 8 and smaller Wet FA60-L7V to FA100-M8V Grinding 8 and smaller Dry FA60-K8V to FA100-L8V 10 and larger Wet FA60-L7V to FA80-M7V Cylindrical Work diameter 1 inch and smaller 14 and smaller Wet SFA80-L6V … Over 1 inch 14 and smaller Wet SFA80-K5V … 1 inch and smaller 16 and larger Wet SFA60-L5V … Over 1 inch 16 and larger Wet SFA60-L5V … Centerless … Wet SFA80-M6V … Internal Under 1 ∕ 2 Wet SFA80-N6V … 1 ∕ 2 to 1 Wet SFA60-M5V … Over 1 to 3 Wet SFA54-L5V … Over 3 Wet SFA46-K5V … Under 1 ∕ 2 Dry FA80-L6V … 1 ∕ 2 to 1 Dry FA70-K8V … Over 1 to 3 Dry FA60-J8V FA60-H12VP Over 3 Dry FA46-J8V FA54-H12VP Machinery's Handbook, 31st Edition
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