十万火急,请高手进来解决一下.

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十万火急,请高手进来解决一下.
看过论坛有人制作的花篮,我也想学着做,如图,它上面三条互相扣的弹簧的草图是这样的,它先草绘曲线,然后扫描一个曲面,然后再用可变截面扫描.用曲面的外边做原始轨迹,内边做X向量轨迹.用关系式:sd11=trajpar*15*360+20,最后得出如图的结果.我也学着这样做,加关系式,却不能.用不用那三个圆,都不行,出现如图情况.但我删了一条直线,只用二条,却能成功.但如图,学人家这样加两个圆,却又不行.关系式是没错的,就算我修改关系式,也不行,请问我错在那里.其实我的做法是跟人家一样的,人家行我却不行.

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