Proper use and care of precision measuring tools is very important if accuracy and reliability are to be maintained. Here are some guidelines to follow much of which is just common sense.
1. Measuring a work piece (on a
lathe) should be carried out only after the work piece has stopped moving;
otherwise, there could be wear on the measuring faces and the accuracy of the
tool may be compromised.
2. Wipe the measuring faces of a precision measuring tool and
the to-be-measured surface of the work piece to prevent the measuring accuracy
from being negatively affected by dirt or dust. It is not advisable to use a
precision tool such as a vernier caliper, micrometer or dial indicator to
measure forged roughcasts or abrasive-bearing pieces, i.e. carborundum, because
the measuring faces will be abraded and accuracy will diminish.
3. Never put precision measuring tools together with hand
tools, such as cutting tools, files, hammers and drills for the fear of bumping
and damaging the precision measuring tools. Never leave them on a lathe or other
running machinery for fear of vibration causing them to fall to the floor.
4. Precision measuring tools should not be used as substitutes
for other tools. Don’t use a caliper as a pry bar or screwdriver! Don’t use a
micrometer for a hammer or C clamp! You might be tempted but don’t do it!
5. Temperature has a substantial impact on the measuring
results. Different materials expand and contract at various rates. Precise
measurement of work pieces should ideally be carried out with the temperature
being about 70ºF but since it’s not always possible to be in an ideal situation
one can minimize any error by having the work piece and the measuring tool share
the same temperature some time prior to the measurement.
Precision measuring tools should not be put under direct sunshine or any other
heat source because accurate measurements will not be achieved as the
temperature increases.
6. Precision measuring tools should never be put near any
magnetic material such as a magnetic worktable, to avoid being magnetized.
8. Tools should be cleaned after use. Perspiration in your
hands can be a bit caustic and react slowly with metallic materials so it is a
good practice to lightly oil the tools to minimize any chemical reaction that
might take place. Store tools in a dry place. Never leave them outdoors.