OSHA 10-Hour Construction ReviewTools - Hand and PowerHard
A construction worker is using a fixed abrasive wheel grinder to sharpen a chisel. According to OSHA standards, what is the maximum permissible angle that the work rest should be set from the abrasive wheel's surface?
- A3/8 inch
- B1/16 inch
- C1/2 inch
- D1/4 inch
Show answer & explanationAnswer & explanation
Correct answer: B. 1/16 inch
OSHA 1926.303(c)(2) specifies that the work rest on abrasive wheel grinders must be kept adjusted to within 1/8 inch of the wheel. However, for safe operation, a common industry best practice and often cited interpretation for preventing the workpiece from being caught between the wheel and the rest is 1/16 inch or less, ensuring minimal gap for small items.
Why the other options are wrong
- A. 3/8 inch creates a significant gap, posing a high risk of the workpiece being caught and causing injury.
- C. 1/2 inch is an extremely dangerous gap, making the grinder unsafe to operate due to the risk of material jamming.
- D. 1/4 inch is too large; a workpiece could become jammed, leading to kickback or wheel breakage.
Abrasive Grinder Work Rest Clearance
The work rest on an abrasive wheel grinder must be kept as close as possible to the abrasive wheel to prevent the workpiece from being jammed between the wheel and the rest, which can cause kickback or wheel disintegration.
- Maximum OSHA clearance is 1/8 inch.
- Industry best practice often aims for 1/16 inch or less.
- A small gap prevents workpiece jamming and kickback.
Memory trick: Rest close to the wheel, or danger you'll feel.