![]() Then enter the coordinates prefixed with the symbol to have them relative to first point of the new line. Type the command line and using the snap on intersection select the intersection created on the curve from the center line. Using the command line, you can enter relative positions to easily create a line with the correct dimensions. The length of this line should be set at 1/20 of the radius of the curve (hint: measure the center line you drew to get the radius). This line will be referenced as the “center line”.ĭraw another line at a right angle starting at the intersection we created with the center line and the initial curve. Using the snap on entity and restricting the line to orthogonal will make drawing this line relatively easy. ![]() Finish the line by setting the second point of the line to be on the curve either at 0 degrees, 90 degrees, 180 degrees, or at 270 degrees. Involute Curveĭraw a line originating at the center point of the initial curve. ![]() Or, if you know the coordinates of the center of the curve, you can simply enter that in the command line when we begin drawing the involute curve. You can enable this toolbar by navigating to Widgets - Toolbars - Snap Selection. This is commonly done with a circle, but you can use an arc as the initial curve as well.Įnable snap on center in the snap selections toolbar. To begin, you’ll need to create the initial curve that the involute curve unwraps around. Once you’ve drawn a few of these curves, you’ll get the hang of it and be able to draw them in a few minutes, depending on the length of the curve you need drawn. The reason why you probably want to draw an involute curve is if you’re drawing gear teeth and are also found in compressors.ĭrawing the involute curve is a little time intensive since there isn’t much automation in LibreCAD to draw the curve. An involute curve is the curve created if you were to start to unwrap a string around another curve.
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