PDFWAC 296-806-40506
Make sure safety guards meet specific requirements.
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 |
• Not higher than 65 degrees above the horizontal centerline of the wheel | |
Surface grinders | • 150 degrees of the wheel |
• 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 |
• Encloses the top 1/2 of the wheel | |
Swing frame grinders using cup wheels | • 1/2 (180 degrees) of the wheel |
• Covers the wheel on the side towards the operator | |
Semiautomatic snagging machines | • 1/2 (180 degrees) of the wheel |
• 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 |