You must make sure the machine safety guards meet the requirements of Table 405-1, Guard Requirements.

Note:	1. The maximum exposure angle is measured by lines starting at the center of the spindle and extending to the ends of the guard at the wheel periphery.
	2. Visors and other accessory equipment are used in determining the size of the guard opening only if they are at least as strong as the safety guard.

Table 405-1

Guard Requirements

Machine	Maximum exposure angle and other guard restrictions
Bench, pedestal, or floorstand grinders	• Not higher than 65 degrees above the horizontal centerline of the wheel
	• 1/4 (90 degrees) of the wheel for grinding done at or above the horizontal centerline of the wheel
	• 125 degrees if the work has to contact the wheel below the horizontal centerline of the wheel
Cylindrical grinders	• 1/2 (180 degrees) of the wheel
Cylindrical grinders	• Not higher than 65 degrees above the horizontal centerline of the wheel
Surface grinders	• 150 degrees of the wheel
Surface grinders	• Not higher than 15 degrees below the horizontal
Cutting-off machines	• 1/2 (180 degrees) of the wheel
Swing frame grinders	• 1/2 (180 degrees) of the wheel
Swing frame grinders	• Encloses the top 1/2 of the wheel
Swing frame grinders using cup wheels	• 1/2 (180 degrees) of the wheel
Swing frame grinders using cup wheels	• Covers the wheel on the side towards the operator
Semiautomatic snagging machines	• 1/2 (180 degrees) of the wheel
Semiautomatic snagging machines	• Covers the wheel on the side towards the operator
Machines used for top grinding	• As small as possible up to 1/6 (60 degrees) of the wheel