OSHA 10-Hour Construction ReviewTools - Hand and PowerMedium
A worker is setting up a bench grinder with two abrasive wheels. According to OSHA, what is the maximum permissible distance between the abrasive wheel and the adjustable work rest?
- A1/2 inch (12.7 mm)
- B1/8 inch (3.2 mm)
- C1/16 inch (1.6 mm)
- D1/4 inch (6.4 mm)
Show answer & explanationAnswer & explanation
Correct answer: B. 1/8 inch (3.2 mm)
OSHA 1910.215(a)(4) specifies that the work rest on abrasive wheel grinders must be kept adjusted to within 1/8 inch (3.2 mm) of the wheel to prevent the workpiece from being jammed between the wheel and the rest, which could cause the wheel to break or the workpiece to be thrown.
Why the other options are wrong
- A. 1/2 inch is significantly too large and creates a serious hazard.
- C. 1/16 inch is too tight and not the specified maximum.
- D. 1/4 inch is too large; it allows enough space for a workpiece to jam.
Abrasive Grinder Work Rest Clearance
The adjustable work rest on an abrasive wheel grinder must be maintained within 1/8 inch (3.2 mm) of the wheel surface.
- Prevents workpiece from jamming between rest and wheel.
- Reduces the risk of wheel breakage.
- Reduces the risk of the workpiece being thrown.
Memory trick: Work rest gap, no more than 1/8, or things will vibrate!