The following table on maximum operating speeds of discs and cylinders is taken from the new safety code.

TABLE 20
STANDARD MAXIMUM SPEEDS IN SURFACE FEET PER MINUTE
		Organic Bonds
Classification Number	Types of Wheels (See Section 1 for Definitions)	Low Strength	Medium Strength	High Strength
		SFPM	SFPM	SFPM
2	Type 2 - Cylinder Wheels including plate mounted, inserted nut and projecting stud - Segments	5000	6000	7000
5	Abrasive Discs: Plat Mounted Inserted Nut and Projecting Stud; Solid or Segmental	5500	7000	8500

Discs of "J" hardness and softer are considered low strength. From K to N medium strength, "O" and harder high strength.

In order to calculate the SFPM of an abrasive disc you need to know:

1. The revolutions per minute of the disc (RPM)
2. The diameter of the disc in inches (D)

Then SFPM =

3.1416 x D x RPM
_____________
12

Discs do not change in diameter with wear. Therefore the SFPM remains the same throughout the life of the disc.

 

Use Anchor's RPM--->SFPM Converter

 

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