How to draw a spiral?

2009-03-05View Original

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I would like to ask everyone, how do I draw a spiral?

Reply #22009-03-05

A planar helix is drawn by alternately drawing semicircles with two centers. For information on drawing spring and threaded helices, see http://zhidao.baidu.com/question/9466338.html?fr=qrl&fr2=query. This post was last edited by sus321 on 2009-3-5 at 13:52.]

Reply #32009-03-12

For the front view, use parallel lines; for the top view, use two concentric circles. For internal threads, mark a little over 3/4 of the way in, and for external threads, mark a little over 3/4 of the way out

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How to draw a spiral?

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