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Change Pitch of Helix (C#)

This example shows how to change the pitch of a helix.

// Preconditions:
// 1. Model containing a helix feature is open.
// 2. Helix feature is selected.
// 3. Open the Immediate window.
// 4. Run the macro.
// Postconditions:
// 1. Pitch of selected helix feature is modified.
// 2. Name of helix feature, original pitch, and
//    modified pitch values are printed to the
//    Immediate window.
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System;
using System.Diagnostics;

namespace PitchHelixFeatureDataCSharp.csproj

partial class SolidWorksMacro

public void Main()

            ModelDoc2 swModel =
            SelectionMgr swSelMgr =
            Feature swFeat =
            HelixFeatureData swHelix =
bool bRet = false;

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swFeat = (Feature)swSelMgr.GetSelectedObject6(1, -1);
            swHelix = (HelixFeatureData)swFeat.GetDefinition();

Debug.Print("Feature = " + swFeat.Name);
Debug.Print(" Original pitch = " + swHelix.Pitch * 1000.0 + " mm");

// Change the pitch value
            swHelix.Pitch = 1.25 * swHelix.Pitch;
Debug.Print(" Modified pitch = " + swHelix.Pitch * 1000.0 + " mm");

// Apply the change
            bRet = swFeat.ModifyDefinition(swHelix, swModel, null);


/// <summary>
        /// The SldWorks swApp variable is pre-assigned for you.
        /// </summary>
        public SldWorks swApp;



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