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how to drawing spiral in autocad

    
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engr_mondo

Assistant Engineer

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Registered: 2012-7-6

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 how to drawing spiral in autocad
04-11-2013 02:23 . pm   |   View his/her posts only
drawing spiral in autocad?
first, determine the diameter and helix Angle of spiral wire, assuming the diameter of 50, helix Angle of 20. So draw a circle with diameter of 50, draw the center line and cut circle, leaving a semicircle, horizontal or vertical. Then mirror semicycle, and so we have two semicircles with different colors. If they are horizontalyl cut, now there are two different semicircle up and down. Then, use UCS to rotate Y 90 degrees, select the two semicircles and rotate 90 degrees, which makes them seem like two straight lines. Use UCS to rotate Y 90 degrees, freeze one of the semicircle layer, rotate a semicircle 10 degrees with the axis of rotation on the left or right side of the quadrant. Then open the frozen layer, rotate another semicircle minus 10 degrees with the axis of rotation in the same quadrant and that is it. You can see the the spiral after you rotate the semicircles.



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