Construction Aid Circle > Radius - Object - Point (Construct Menu)

This command draws a Construction Aid circle, which has a given radius, is tangent to a given line (or Construction Aid line) or circle (or Construction Aid circle) and runs through a given point.

If a Construction Aid circle is to be drawn while working in isometric or dimetric views, this must be done with the command Construction Aid Ellipse > Vector - Vector because the result on the page is not circular but elliptical.

After choosing the command, a dialog appears in which the Construction Aid circle's radius can be specified.

Any part object in an existing object can be identified as the reference object. This can be a side of a rectangle or a circle arc within a surface. Ellipses and ellipse parts cannot be identified.

The identified (part) object is referred to as the "Reference Object".

The position at which the object is identified (the "ID point") has no effect on the rest of this command. As there are up to four possible results, it would be to complicated to make a choice based on the ID point's position.

The point through which the Construction Aid circle should run can be entered with the mouse by clicking anywhere in the drawing.

After identifying the reference object and entering the point, all possible circles are worked out (the graphic shows one possible set of results).

The Construction Aid desired circle can then be chosen with the help of a small dialog. Only one circle can be chosen at a time.

If the distance between the point and the object is more than twice the radius, it is not possible to calculate the Construction Aid circles. In this case, a corresponding error message appears.