Tc 9-524 fundamentals of machine tools

5-2
Bench Type Utility Grinding Machine
Like the floor mounted utility grinding machine, one coarse
grinding wheel and one fine grinding wheel are usually
mounted on the machine for convenience of operation. Each
wheel is provided with an adjustable table tool rest and an eye
shield for protection. On this machine, the motor is equipped
with a thermal over-load switch to stop the motor if excessive
wheel pressure is applied thus preventing the burning out of
the motor. The motor revolve at 3.450 RPM maximum to
provide a maximum cutting speed for the 7 inch grinding
wheels of about 6,300 surface feet per minute (SFPM).

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TC 9-524
Bench-Type Utility Drill Grinding Machine
The bench-type drill grinding machine is intended for drill
sharpening. The accuracy of this type of grinder is not
dependent on the dexterity and skill of the operator because
the drill is placed in a holding device. The holding device
places the drill in the correct position for the clearance and
included angle. For more information on this machine refer to
chapter 4.
Bench-Type Utility Grinding and Buffing
Machine
The bench-type utility grinding and buffing machine is more
suitable for miscellaneous grinding, cleaning, and buffing It is
not recommended for tool grinding since it contains no tool
rests, eyeshields, or wheel guards. This machine normally
mounts a 4 inch-diameter wire wheel on one end. The wire
wheel is used for cleaning and the abrasive wheel is used for
general grinding. One of the two wheels can be removed and a
buffing wheel mounted in its place for buffing and polishing.
The 1/4-HP electric motor revolves at a maximum of 3,450
RPM. The maximum cutting speed of the 4-inch-diameter
wheel is approximately 3,600 SFPM.