Work Rest Adjustment and Operating Techniques Flashcards
7 cards from real Abrasive Wheels Training Certificate practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Work Rest Adjustment and Operating Techniques flashcards as text
What is the maximum recommended gap between the spark arrestor (tongue guard) and the abrasive wheel?
Answer: 6 mm
The spark arrestor or tongue guard must be adjusted to within 6 mm of the wheel to limit the exposed arc of wheel and deflect sparks safely away from the operator.
What immediate action should an operator take if an abrasive wheel begins to vibrate excessively during use?
Answer: Stop the machine immediately and report the fault to a competent person
Excessive vibration may indicate imbalance, mounting problems, or structural damage to the wheel; the machine must be stopped immediately to prevent a potentially fatal wheel burst.
Under what circumstances is it acceptable to grind on the flat side face of a straight abrasive wheel?
Answer: Never, unless the wheel is specifically designed and marked for side grinding
Straight wheels are not designed to resist lateral forces; side grinding induces stresses that can cause the wheel to crack or burst violently unless it is a type specifically engineered and marked for that purpose.
What is meant by 'glazing' of an abrasive wheel?
Answer: The wheel face becoming smooth and polished, losing its cutting ability
Glazing occurs when abrasive grains become dulled and the wheel face appears smooth and shiny, making it ineffective at cutting and causing excessive friction and heat.
What is the safest method for removing grinding dust and swarf from a bench grinder?
Answer: Use a vacuum extraction system or a damp cloth
Compressed air and dry brushing disperse fine grinding dust and potentially harmful metal or silica particles into the atmosphere; vacuum extraction or damp methods contain the dust safely.
Why is grinding aluminium or other soft non-ferrous metals on a standard bench grinder particularly hazardous?
Answer: The soft metal clogs the wheel's pores, risking loading, overheating, and wheel failure
Soft non-ferrous metals such as aluminium smear into the wheel's pores causing rapid loading, which generates excessive heat and significantly increases the risk of the wheel breaking apart.
Which of the following describes the correct way to present a workpiece to a bench grinder wheel?
Answer: Into the downward rotation at the front of the wheel, supported on the work rest
Presenting the workpiece into the downward rotation at the front of the wheel, supported on the work rest, directs sparks downward and gives the operator maximum control over the cut.