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Add Spring to Motion Study Example (C#)

This example shows how to add a spring to a motion study.

// Preconditions:  
// 1. Open public_documents\samples\tutorial\api\wrench.sldasm.
// 2. Verify that the MotionManager tab is visible. If it is not visible,
//    click View > MotionManager.
// 3. Right-click the project, select Add Reference, click Browse, and
//    select install_dir\api\redist\CLR2\SolidWorks.Interop.swmotionstudy.dll.
// 4. Open the Immediate window.
// Postconditions:
// 1. Adds a spring feature between the grips of the wrench.
// 2. Examine the Immediate window.
// NOTE: Because the assembly is used elsewhere, do not save changes.

using SolidWorks.Interop.sldworks;

using SolidWorks.Interop.swconst;

using SwMotionStudy;

using System;

using System.Diagnostics;

namespace ExampleCS.csproj


    public partial class SolidWorksMacro


        public void Main()


            ModelDoc2 swModel;

            ModelDocExtension swModelDocExt;

            MotionStudyManager swMotionMgr;

            MotionStudy swMotionStudy1;

            SimulationSpringFeatureData swSpringFeat;

            bool boolstatus;

            Feature swFeat;

            SelectionMgr swSelMgr;


            swModel = swApp.ActiveDoc as ModelDoc2;

            swModelDocExt = swModel.Extension;

            swSelMgr = swModel.SelectionManager as SelectionMgr;


            // Get the MotionManager

            swMotionMgr = swModelDocExt.GetMotionStudyManager() as MotionStudyManager;

            if ((swMotionMgr == null))





            // Get "MotionStudy1_Distance=0.5in"

            swMotionStudy1 = swMotionMgr.GetMotionStudy("MotionStudy1_Distance=0.5in");

            if ((swMotionStudy1 == null))


                swApp.SendMsgToUser("MotionStudy1_Distance=0.5in is not available.");




            // Activate swMotionStudy1



            // Define spring feature

            swSpringFeat = swMotionStudy1.CreateDefinition((int)swFeatureNameID_e.swFmAEMLinearMotionSpring) as SimulationSpringFeatureData;

            if (swSpringFeat == null)


                Debug.Print("ERROR: Creation of Spring feature data object failed.");




            // Select spring's endpoints

            Face2 swFace1;

            Face2 swFace2;

            swModel.ShowNamedView2("*Left", 3);

            boolstatus = swModelDocExt.SelectByID2("", "FACE", 0.03344586330968, 0.0525345575174, 0, true, 0, null, 0);

            swFace1 = swSelMgr.GetSelectedObject6(1, -1) as Face2;

            boolstatus = swModelDocExt.SelectByID2("", "FACE", 0.02244533711473, 0.0131288302002, 2.238961779386E-04, true, 0, null,


            swFace2 = swSelMgr.GetSelectedObject6(2, -1) as Face2;


           // Set spring's characteristics

            swSpringFeat.SetEndPoints(swFace1, swFace2);

            swSpringFeat.CoilDiameter = 0.0102;

            swSpringFeat.NumberOfCoils = 3;

            swSpringFeat.WireDiameter = 0.00152;

            swSpringFeat.FreeLength = 0.02;


            // Create Spring feature

            swFeat = swMotionStudy1.CreateFeature(swSpringFeat) as Feature;            

            if (swFeat == null)


                Debug.Print(" ERROR: Creation of the Spring feature failed.");




                Debug.Print("Type of the feature added: " + swFeat.GetTypeName2());


            Debug.Print("Type of spring as defined in swSpringType_e: " + swSpringFeat.Type.ToString());



        /// <summary>

        ///  The SldWorks swApp variable is pre-assigned for you.

        /// </summary>

        public SldWorks swApp;



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