![]() ![]() Click to select each of the lines, and then press ENTER to accept the default radius value. You can use the Tangent, Tangent, Radius method to create a circle tangent to any two objects. Notice that the new circle is still tangent to the two lines, but now it touches them much further from the points you used to select those lines. 75 ", half the size of the previous circle. ![]() Next, when the program prompts you to specify the radius, type ". So you do not have to click the arrow this time you can simply click the button.Īgain, click to select the first line, but this time click to pick a point near the end of the line. Any time a button includes a flyout like this, whichever option you choose from the flyout becomes the new default method assigned to the button. Notice that the Tangent, Tangent, Radius method is now the default method shown in the Circle button. If you had specified a smaller radius, the tangency points would be closer to the intersection of the two lines.Ĭreate another circle tangent to those same two lines. It is not necessarily drawn at the points you specified, but it is tangent to the lines you specified. Notice that the circle is tangent to the two lines. As soon as you press ENTER, the circle is created. You can either pick points to specify the radius or type the value. There is a default value from the last time you used the CIRCLE command. You still do not see the circle, but now the command is prompting you to specify the radius of the circle. You can click to pick a deferred tangent point on the other line. It now asks you to specify a point on an object for the second tangent of the circle and again you see the same glyph and tooltip. Then move the cursor over to the other line. This is an object snap that automatically pops up and allows you to snap to that geometry. In the command window and at the dynamic command prompt, you can see that the program is prompting you to specify a point on the object for the first tangent of the circle, and as you move the cursor anywhere over one of the lines, you see a small glyph and a tooltip appears that says Deferred Tangent. ![]() Suppose that you want to create a circle that is tangent to two lines. The Tangent, Tangent, Radius method creates a circle with a specified radius that is tangent to two existing objects. You can find this method in the Circle split-button in the Draw panel of the Home ribbon. The first method is called Tangent, Tangent, Radius. There are several different methods you can use to create circles that are tangent to other objects. Watch video tutorials and lessons made by AutoCAD experts.Ī circle is one of the most basic objects you can create. #Drawing sine waves in autocad how toI set the amplitude to 100 to yield a better aspect ratio.Learn how to draw circles using the TTR and TTT options with AutoCAD 2018. I think a rounded value of -24,-1 for the second CV yields very good results. I found that the average error was a function of how many points were used and their distribution. I used Excel's Goal Seek to minimize the error by changing the value of cell A7. It is the average of the differences between the B-spline curve and the sine curve. Cell J26 indicates the error between the two curves. By changing the value of cell A7 (the x location of the second CV), the shape of the spline changes (cell A8 is -1 times A7). I used the custom Excel/VBA function to determine the location of 4 CVs for a degree 3 B-spline that would best approximate a sine curve. Otherwise they become a NURBS (Non-Uniform Rational B-spline) and the math becomes more complex (and frankly, beyond me). AutoCAD splines can be considered B-splines if the weight values for all Control Vertices are 1.0 (the default value). The attached VBA macro enabled Excel file includes a B-Spline function I created last year. ![]()
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