Measuring A Typical Workpiece; Measurement Of Workpiece Outer Dimensions - Easson EX-100 Manual

and instrument stay in the same ambient to make them with the same temperature.
Temperature shall be not variable considerably during measurement. If temperature
deviating 20 and workpiece/instrument with different temperature, this will result in
error of measurement.
If above mentioned condition can't be met, the error in length will be:
L [
¢
¡
Where:
: linear expansion coefficients for workpiece and instrument scale;
¢ ¢
w i
¢
t t : actual temperature for workpiece, actual temperature for instrument
w i
¢
L, L : normal length of workpiece, error in measurement due to different
Linear expansion coefficient for scale: 10
During measuring large-size high precision workpiece, we shall check temperature of the
workpiece and instrument and find out the linear expansion coefficient for workpiece.
Then calculate L according to the above formula and correct the measuring results. the
workpiece and instrument temperature can be checked with a attached thermometer. With
regard to our EX-100 instrument, the error in measurement will be corrected by the
software.

5.2 Measuring a typical workpiece

5.2.1 Measurement of workpiece outer dimensions

For workpiece outer dimensions, there are two measuring methods (absolute and
relative).
First adjust the cap-shaped measuring accessories, the measuring force according to
and take attention for temperature. Then select and mount a appreciate worktable, and fix
the workpiece on the worktable.
Procedures for absolute measurement:
a) First make the two cap-shaped measuring accessories contact, record the reading
Lo and reset the display by pressing a key;
b).Move the workpiece between the two cap-shaped measuring accessories and make
them contact to find the "turn-over pint" and record the reading L
dimension L =L L
1 0
¡
(t 20) (t 20)]
¡ ¡
¢
w w i i
¡ ¡ ¡
temperature
10
¡
18
L
¡
-6
1/
£
5.1
c).Workpiece actual
1;