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# Mastercam Arc Polar Endpoints ribbon bar

Choose Create, Arc, Arc polar endpoints.

Arc Polar Endpoints ribbon bar

 Use this ribbon bar to create polar arcs from either a defined start or end point. Click in the graphics window to set the first point and then enter values in the ribbon bar fields to define the radius/diameter, start angle, and end angle. This function allows you to enter values in the X, Y, and Z fields in AutoCursor to position the first point of the arc. Shortcut Keys I – Edit end point (edits end point) T – Start point (sets start point as first point) N – End point (sets end point as first point) R – Radius (defines circle radius) D – Diameter (defines circle diameter) S – Start Angle (defines start angle) A – End Angle (defines end angle) P – Apply O – OK (fixes live entity and exits function) What do you want to do?

### Arc Polar ribbon bar

How do I get here?

Choose Create, Arc, Arc polar.

Arc Polar ribbon bar

 Use this ribbon bar to create polar arcs. Click in the graphics window to set a center point and then click to set two edge points which define the radius, start point, and end angle. If you double click the first edge point, you will not be prompted to select a second edge point and a full circle will be created. Alternatively, you can manually enter values into the ribbon bar fields to set the circle size, start angle, and end angle. You can then select the center point in the graphics window to position the arc. This function allows you to enter values in the X, Y, and Z fields in AutoCursor to position any or all of the three points of the arc or two edge points and the center point. You can also create arcs tangent to curves and points. See Guidelines for creating arcs tangent to entities for more information. Notes: If the Tangent button is pressed, the first edge point selection (radius and arc start point) will only accept an entity. That entity will be the tangent entity for the resulting arc. You can create a full circle by entering 0 for the start angle and 360 for the end angle. Mastercam calculates arcs in a counterclockwise direction. You can change this direction by using the Flip button. Dragging the mouse through the start angle will also change this direction. No more than two of the points you select can be collinear. Shortcut Keys N – Edit center point (edits center point) F – Flip R – Radius (defines arc radius) D – Diameter (defines arc diameter) S – Start Angle (defines start angle) A – End Angle (defines end angle) T – Tangent (creates a circle tangent to one entity) P – Apply O – OK (fixes live entity and exits function)