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Arc 3Points

Draft

Description

The Draft Arc command creates a circular arc on the current working plane from a center, a radius, a start angle and an aperture angle. The radius and the angles can be defined by picking points.

A Draft Arc is in fact a Draft Circle with a DataFirst Angle that is not the same as its DataLast Angle.

Arc defined by four points, center, radius, initial point of arc and final point of arc

Usage

See also: Draft Tray, Draft Snap and Draft Constrain.

1. There are several ways to invoke the command:
   • Press the Arc button.
   • Draft: Select the Drafting → Arc Tools → Arc option from the menu.
   • BIM: Select the 2D Drafting → Arc option from the menu.
   • Use the keyboard shortcut: A then R.
2. The Arc task panel opens. See Options for more information.
3. Pick the first point, the center of the arc, in the 3D View, or type coordinates and press the Enter Point button.
4. Pick the second point in the 3D View, or enter a Radius.
5. Pick the third point in the 3D View, or enter a Start angle.
6. Pick the fourth point in the 3D View, or enter an Aperture angle.

Options

The single character keyboard shortcuts available in the task panel can be changed. See Draft Preferences. The shortcuts mentioned here are the default shortcuts.

• To manually enter the coordinates for the center enter the X, Y and Z component, and press Enter after each. Or you can press the Enter Point button when you have the desired values. It is advisable to move the pointer out of the 3D View before entering coordinates.
• Press G or click the Global checkbox to toggle global mode. If global mode is on, coordinates are relative to the global coordinate system, else they are relative to the working plane coordinate system.
• Press N or click the Continue checkbox to toggle continue mode. If continue mode is on, the command will restart after finishing, allowing you to continue creating arcs.
• Press S to switch Draft snapping on or off.
• Press Esc or the Close button to abort the command.

Notes

• A Draft Arc can be edited with the Draft Edit command.

Preferences

See also: Preferences Editor and Draft Preferences.

• If the Edit → Preferences → Draft → General → Create Part primitives if possible option is checked, the command will create a Part Circle instead of a Draft Circle.

Properties

See Draft Circle.

Scripting

See also: Autogenerated API documentation and FreeCAD Scripting Basics.

To create a Draft Arc use the make_circle method (introduced in 0.19) of the Draft module. This method replaces the deprecated makeCircle method.

Example:

import FreeCAD as App
import Draft

doc = App.newDocument()

arc1 = Draft.make_circle(200, startangle=0, endangle=90)
arc2 = Draft.make_circle(500, startangle=20, endangle=160)
arc3 = Draft.make_circle(750, startangle=-30, endangle=-150)

doc.recompute()

Fillet

Arc 3Points

Draft