CAD作图技巧(国外英语资料).doc

CAD作图技巧(国外英语资料)Keywords: CAD drawing skillsDrawing skillsHow to draw elliptical arcThe key to drawing an elliptical arc is to draw a full ellipse first, then move the cursor and delete a part of the ellipse. Leave the desired elliptical arc.First, type ELLIPSE or select the Ellipse icon.Options are as follows: Arc/Center/Axis Endpointl:Type: Arc, enter Draw an ellipse in any way. Then prompts for the desired arc segment information:Response: Parameter/start angleType: 0 or the point on the selected screen that represents the starting point of the angle.The initial angle (start, angle) is defined as the starting point of the arc.Response: Parameter/Included/end angle:Select the end angle of the arc length defined (end, angle). You can also type I, and type in the package angle. The angle of the package starts at the beginning, not from 0How to draw a smooth curve?Although the arc is a curve, it often needs to draw a smooth curve, and it does not adapt to the center of the circle and the radius of the arc. The following methods are available.Draw a polyline first in the direction that you want to draw the smooth curve. Then select the points that you can use as points that are the vertices of the curve. Then type PEDIT and select the polyline.There are two options: FIT or SPLINE. The FIT child command ensures that the curve passes through each vertex, and the SPLINE command produces a smoother curve because the curve does not necessarily pass through the vertices. If you want to make a curve straight, you can use the DECURVE sub - command in the PEDIT for the FIT or SPLINE curves.In the middle of this book, a more mature approach to using the SPLINE command or SPLINEDIT is described.Type PLINE and draw multiple segments, and select some points randomly. For example, draw five or six dots.Type: PEDIT enter (or select from the Modify toolbar)Response: Select polylineSelect any point on the polysemous line.Response: Close/Join/Width/Edit, vertex/Fit, curve/Spline, curve