Question

if excessive pressure is applied to the grinding wheel, it is likely to cause * 2 points

a. a bent arbor
b. a distorted piece of metal
c. an overheated piece of metal
d. a chipped grinding wheel

if the arbor revolutions per minute (rpms) of a given grinder is 3400, which grinding wheel would be safe for use on this particular grinder? * 2 points
a. 1700 rpm grinding wheel
b. 2400 rpm grinding wheel
c. 2800 rpm grinding wheel
d. 4600 rpm grinding wheel

Explanation:

1. When excessive pressure is applied to a grinding wheel, the mechanical stress can cause the wheel to chip. Other options like a bent arbor is more related to improper mounting or imbalance, a distorted piece of metal is more about the handling of the workpiece during non - grinding operations, and overheating of metal is due to grinding speed and coolant issues rather than just pressure on the wheel.
2. For a grinder with an arbor RPM of 3400, a safe grinding wheel should have an RPM rating equal to or higher than the arbor RPM. This is to prevent the wheel from disintegrating due to being spun faster than its rated speed. Options a, b, and c have lower RPM ratings than the arbor RPM of 3400 and thus are unsafe.

Answer:

1. d. a chipped grinding wheel
2. d. 4600 RPM grinding wheel