User`s manual

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drag squares to
resize the
search area
iNspect Express User’s Manual405-00026-00
25Rev 1600; 12 July 2010
Using the Arc Tool
The Arc tool measures the radius or circularity (roundness) of an Arc, or an incom-
plete circle.
a. Click on the “Arc” button. Move the mouse over the image in the Work Area. You should see
sections of the edges in the image highlighted as you move across them. These are “edge
candidates” that you can use with Arc. Valid edges are arcs, curves and circles only.
b. Find a curve or circle that matches your mea-
surement. Click on 3 points along the curve
edge: start, middle and end of the measure-
ment. The Arc is labeled (AR1).
c. The measured Arc, and a pair of blue curves ap-
pear, one inside and one outside the measured
Arc. These two curves define the search area
for locating the Arc. You can drag the solid
squares on these curves, to resize them and in-
crease the search area; but searching more area
increases the processing time.
d. When you hover the cursor over the Arc, the curve turns red, and a message appears telling
you to “Right-click to edit.” Several radial lines and small pink dots appear at even spacing
around the arc. These are “sample points” for finding the edges of the arc.
e. Right-click on the highlighted curve. An Arc Properties box opens. In this box you can: re-
name the measurement, set the tolerances for recycle and reject, change the “accuracy”
(number of sampling points around the curve; the pink dots and radial lines). Use the tabs
and “Enable” check boxes to select measurements.