This product is a produced by Black and Decker. The product is
used to grind down metal. How It Works Inside the grinder there
is an electric motor that spins a shaft connected to a bevel
gear. The bevel gear is then attached to another driving shaft.
A grinding wheel is clamped onto the driving shaft, causing the
grinding wheel to spin. Because of constant friction and the
forces acting on each component there is a certain life expency.
This varries for individual parts based on the force acting on
the part and the design of the part. For the bearing, an assumed
torque of 0.315 Nm was applied to the shaft. Assuming the
grinder is being used constantly the bearing would last 1.83
years before failure. If the grinder was being used six hours
every day, 365 days a year then the bearing would last 7.33
years. If the grinder was being used six hours a day, five days
a week, the bearing would last 10.26 years. For the force
requirement on the gears to rotate the grind wheel at 10,000
RPM, the power consumption of