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If we cut a circle between two lines that cross the circle, the part that remains is an arch.
In Autocad an arc is a curved line of a certain radius, passing through three points.
By activating the command “arc” In fact, the program will ask how the basic method, to add three points on the screen, which correspond to the starting point at the intermediate and the final bow.
As we have seen for the circle, once you activate the command, the “command line” show information about the execution, plus other options in square brackets [ ] that allow you to draw an arc along many different sequences and reference points, in adding to the one described (beginning, middle, end), the image points 1,2,3.
For example (start, end, center * ) or (start, end, radius), (start, radius, angle) and so on.
* the center of an arc means the center of its radius.
Initially, however, it is better to concentrate and understand the basic operation (start, midpoint, end).
We’ll talk about now of a feature that can be very useful for certain jobs.
We construct an arc randomly as we have already tried to do …, well once you draw if you press “enter” twice, or right mouse button, then we’ll draw another arc connected, and then subsequent to the end point of the first.
Now we can click on a screen that will be the end point of this second arc.
Repeating again by double clicking the right mouse is to begin on a third arc following the second and so on, we can continue to draw consecutive arcs of different size and direction, such as curls or spirals.
The interesting thing is that these strings are contiguous to each other, that will be perfectly connected, without angles at their points of union.
This is especially important in cases where the fact pattern were to be exported and used as input file for machining on CNC machines.
Think for example the design of a decoration to be carried on a glass or a marble floor, to cut according to our design, or a sheet metal to be cut by laser.