CAD绘制渐开线过程

齿轮渐开线的绘制方法及技巧

CAD画渐开线

1.进入菜单:工具>宏>visual Basic编辑器;

2.在编辑器中选菜单:插入>模块;

3.把这部分程序拷贝到（代码）窗口中;

4.选择菜单：运行>运行子过程用户窗体;

5.在AutoAcad绘图界面中可以看到结果.

Sub jkx()

Rem 绘制渐开线,By Sdh,2006-6-8

Dim d As Double '节圆直径

Dim r As Double '节圆半径

Dim A As Double '总展开角度

Dim Ai As Double '展开角度

Dim Li As Double '展开弧长

d = 100

A = 360

r = d / 2

Dim Pnt1(2) As Double

Dim Pnt2(2) As Double

Dim PntLst() As Double, N As Integer

ThisDrawing.ModelSpace.AddCircle Pnt1, r

For Ai = 0 To A * Atn(1) / 45# Step Atn(1) / 45# Li = r * Ai

Pnt1(0) = r * Sin(Ai)

Pnt1(1) = r * Cos(Ai)

Pnt2(0) = Pnt1(0) - Li * Cos(-Ai)

Pnt2(1) = Pnt1(1) - Li * Sin(-Ai)

ThisDrawing.ModelSpace.AddLine Pnt1, Pnt2 N = N + 1

ReDim Preserve PntLst(N * 2 - 1)

PntLst(N * 2 - 2) = Pnt2(0)

PntLst(N * 2 - 1) = Pnt2(1)

Next

If N > 1 Then

ThisDrawing.ModelSpace.AddLightWeightPolyline PntLst End If

End Sub