Chapter 8 Power Tools 217
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The solution is to use a tool called a wheel dresser to remove the outer layer of
worn, contaminated grit and restore the abrasive cutting surface, Figure 8-53.
Wheel dressers are available in two basic types. The fi rst uses a bonded
diamond or similar very hard abrasive on the end of a stick or rod. The
second type of dresser has a row of free-spinning, star-shaped hardened
wheels. Both types are run on the surface of a grinding stone to dislodge
contaminants and worn abrasives. The use of a dressing wheel or dressing
stick also helps true the stone, keeping the stone surface perfectly round
and balanced.
Selecting and Purchasing Power Tools
The job at hand, power supply, versatility, quality, investment, and
availability of parts and service are all factors that must be considered when
selecting the proper power tools. Is the job a one-time occurrence, or is it
an ongoing or repeated task? Are there different tools that may perform the
same job? Some jobs require very specifi c tools. For other jobs, multipurpose
tools may be an option. However, as a rule, multipurpose tools are usually
not as effi cient as their more specialized counterparts. Tools designed for
a single task can also be expected to have a longer useful life than tools
designed as a compromise among several tasks.
B
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Figure 8-52. The size of the grit particles that make up an abrasive affect the speed at
which it is capable of removing material. The fine stone (A) removes material much more
slowly than the coarse stone (B).
A
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