怎样画出螺旋?
<FONT face=宋体 color=#333333>各位大虾: </FONT>我学习CAD有一段时间了,但不知怎样画出立体螺丝线来? 不能在AUTOCAD中直接画出,一般需要编程。 画出来都是近似的,看一圈有多少个控制点,说直观点就是多边形,根本做不出像平面圆那种精确的,最起码理论上是精确的 Threads.lsp可以自动画3D solid螺纹。 版主:
你好,我加载成功后,不知输入什么命令才能画出立体螺丝? <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">(defun c:tanhuang(/)<BR> (setq p1 (getpoint "请指定螺旋线基点:"))<BR> (setq r (getreal "请输入弹簧平均半径:"))<BR> (setq d0 (getreal "请输入弹簧丝直径:"))<BR> (setq disp (getreal "请输入弹簧节距:"))<BR> (setq n0 (getint "请输入弹簧工作圈数:"))<BR> (setq n (getint "请输入每圈细化段数 (32/36/40/44/48/52/56/60) :"))<BR> (setq n1 (* 1.25 n)) ;支撑圈细化段数 <BR> (setq n1 (fix n1))<BR> (setq n2 (* n0 n)) ;工作圈细化段数<BR> (setq delta (/ (* 2.0 pi) n)) ;单位转角<BR> (setq j (/ disp n)) ;工作圈轴向位移量 <BR> (setq j0 (/ d0 n)) ;支撑圈轴向位移量<BR> (setq bb (caddr p1))<BR> (setq ang 0)<BR> (setq jj 0)<BR> (command "ucs" "n" p1)<BR> (setq pt1 (list r 0 0))<BR> (command "3dpoly" pt1)<BR> (repeat n1 ;绘制下支撑圈<BR> (setq jj (+ jj 1))<BR> (setq ang (+ delta ang))<BR> (setq pt (list (* r (cos ang)) (* r (sin ang )) (* j0 jj)))<BR> (command pt)<BR> )<BR> (setq p2 (list 0 0 (* j0 jj)))<BR> (setq g1 (* j0 jj)) ;下支撑圈高度<BR> (setq jj 0)<BR> (repeat n2 ;绘制工作圈<BR> (setq jj (+ jj 1))<BR> (setq ang (+ delta ang))<BR> (setq pt (list (* r (cos ang )) (* r (sin ang)) (+ g1 (* j jj))))<BR> (command pt)<BR> )<BR> (setq p3 (list 0 0 (* j jj)))<BR> (setq g2 (* j jj)) ;工作圈高度<BR> (setq jj 0)<BR> (repeat n1 ;绘制上支撑圈<BR> (setq jj (+ jj 1))<BR> (setq ang (+ delta ang))<BR> (setq pt (list (* r (cos ang)) (* r (sin ang)) (+ g1 g2 (* j0 jj))))<BR> (command pt)<BR> )<BR> (setq g3 (* j0 jj)) ;上支撑圈高度<BR> (command "")<BR> (setq e1 (entlast ))<BR> (command "ucs" "x" "")<BR> (command "circle" pt1 (/ d0 2))<BR> (setq e2 (entlast))<BR> (command "extrude" e2 "" "p" e1) ;拉伸弹簧<BR> (setq e3 (entlast))<BR> (setq pt2 (list r (/ d0 4) 0))<BR> (setq py (+ g1 g2 g3 (- 0 (/ d0 4))))<BR> (setq pt3 (list (- 0 r) py 0))<BR> (command "slice" e3 "" "zx" pt2 pt3) ;磨平端部支撑面<BR> (command "slice" e3 "" "zx" pt3 pt2)<BR> (command "ucs" "w")<BR> )
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