T-FLEX Parametric CAD. Fundamentals. 2D Design

Editing Circles
Circles
The same command “EC: Edit Construction” is used for editing circles as for any other construction
entities. We have already reviewed the capabilities of this command on the example of editing construction
lines in the previous chapter. Editing circles is done in a similar way.
Besides, when editing a circle tangent to two lines, the automenu gains additional options for setting and
clearing a “link” with a node:
Link Arc or Circle to Node
Break Link with Node
The option is used for constraining a circle, tangent to two lines, by an additional node defining the
tangency configuration. Upon calling the option, select the desired node by clicking . The circle will be
reconstructed as the result of using this option to pass as close to the node as possible. This allows to
uniquely define the circle location with respect to the reference lines.
The example below explains the use of this capability. The location of the lines on the drawing is defined
with respect to the symmetry axis using a parameter K. Both circles are constructed tangent to the two lines.
Besides, the solid-drawn circle is “linked” to the highlighted node. Meanwhile, no reference node is defined
for the second circle. Originally, with the variable K=1, the drawing looks like shown on the diagram on the
left-hand side. The right-hand side diagram shows the drawing modification per the new variable value К=-
1. The circle linked to the node adjusted correctly. The second circle that did not reference any node, flipped
with respect to the symmetry axis.
To release or re-assign a link with a node, use the option .
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