Arc Center

Introduction

This topic will explain the Arc Center function, will explain whereto find the function, and explain the options found in it.This topicwill also give a brief description of Dynamic Drawing, the Snap Incrementfunction, explain creation with quick steps and an example, and provide links to relatedtopics.

The Arc Center Function

The Arc Center function is used to create arcs of a specified radius,and start and end angles, by defining the origin of the arc.This canbe accomplished by sketching, picking a point or snap point in the graphicsarea, or entering the coordinates of the origin.You can also use theMulti-Picking option and select multiple points in the graphics area atonce to create the specified arc on each selected point.

Dynamic Drawing

This function supports Dynamic Drawing which allows you to use a combination of sketching and data entry to create the entities. After initially sketching the entity, it becomes an active entity, which is an entity that is in Modify Mode. Entities in Modify Mode display in the current Entity color, but displays with a greater line thickness to make them easier to identify. Active entities can be modified using data entry. The benefit of Dynamic Drawing is that you can quickly sketch a point to get the approximate result and then use data entry to update to the exact dimensions, and coordinate values as needed.

 

Entities in Modify Mode

Final Entities

 

In the images above, we see entities which are still in Modify Mode, followed by those same entities after they are finalized.

Snap Increment

This function support the use of the snap increment when selecting the location of the entities. The snap increment allows you to get precise results when using mouse selection and helps to reduce data entry modifications.

 

To learn more, view Snap Increment.

To open Arc Center:

  • In the Entity group, of the Create 2D ribbon, click the down arrow under Arc, and select Arc Center.

The parameters display in the Data Entry Manager.

The Data Entry Parameters

Arc

Creation Option

Parameters

Center Selection Mode

  • Single Picking/Coordinates - the axis will be defined manually, with an existing axis, or a defined vector.
    Multi-Picking - the axis will be defined by selecting a line, or surface edge.

    The following parameters vary depending on the Center Selection Mode option that is chosen:

Single Picking/Coordinates

Center

  • X- sets the location of the arc center along the X axis.
  • Y -sets the location of the arc center along the Y axis.
  • Z -sets the location of the arc center along the Z axis.

Multi-Picking

Selected Geometry

 

(Delete) - removes the highlighted item from the Selected Geometry list.

(Delete All) - removes all entities from the Selected Geometry list.
The list will display all entities currently selected for the function.


Dimensions

  • Diameter - sets the width of the arc, as it would be in its complete circular state, from side to side.

  • Radius - sets the distancefrom the center of the arc to the circumference.

  • Start Angle - sets therotation angle at which the arc begins measured from the positiveX-axis.

  • End Angle - sets therotation angle at which the arc ends measured from the positive X-axis.

  • Other Half - allowsyou to choose the other half of the specified angle range.

  • OK - finalizes the function.

  • Cancel - exits the function.

Quick Steps - Arc Center

Single Picking/Coordinates

  1. Open the function and click a snap pointor anywhere in the graphics area to set the arc center.

    You can modify the snap incrementvalue or turn it off while selecting the arc center and the arc radius.

    The arc changes from the Preview color to the Entity color and displayswith a greater line thickness to show it is the active entity.



  2. With Dynamic Drawing, you can update theData Entry parameters to modify the active entity, or you can continuesketching.

    If you continue sketching, the active entity is automatically finished,as seen in the images below.



  3. After updating the Data Entry parameters,to finish the active entity, you can either click OKor you can click the next arc center.



  4. Repeat this process of using sketching anddata entry to create arcs as needed.

  5. To close the function, click Cancel.

Multi-Picking

  1. Open the function and select the Multi-pickingoption in the Center Selection Modegroup.

    The Selected Geometry list appears.

  2. Select the points in the graphics area toset as the arc centers.

    The arcs appear on the points, and are now active entities.



  3. Update the Data Entry parameters to modifythe active entities.

  4. After updating the Data Entry parameters,to finalize the active entities, click OK.



  5. Continue this process to create the neededpoints.

  6. To close the function, click Cancel.

Example

  1. In the Quick Access Toolbar, click New.

  2. In the Entity group, of the Create 2D ribbon, click the down arrow under Arc, and select Arc Center.

    The preview appears showing an arc at the default radius.

  3. Update the Radius to 0.5000.



  4. Update the value for CenterX value to 0.2500.



  5. Update the value for CenterY to 0.2500.



  6. Update the End Angle to 90.0000.



    Notice the arcs produced by BobCAD-CAM move from the Start angle, counter clockwise to the End Angle.

  7. In the Data Entry Manager, click the Other Half button.



    Notice the Start Angle and End Angle do not change, but the preview of the result does.

  8. Click OK to finalize the arc.



    The preview reverts to the original Start and End Angles.

  9. Click Cancel to exit the function.

Related Topics

The CADOverview