今天跟客户交流时有点分歧，在这请各位量友来帮我参谋下我的思路是否正确：比如我已一零件基准平面为第一轴找正后，其余在同一平面上的二维元素的投影方向都会去参考它，问题就是它构造出后是否会与当前工作平面是平行的，比如我在离找正基准平面 -Z=100处采集一个圆（有可能在取点时会有偏差），最后这个圆选择投影方向Z轴后它是否会跟Z轴是平行的，客户说要把二维元素全部投影到基准平面上后在评价，我说不需要因为该元素在采集构造出后会以当前工作平面作为参考，也就是说会跟当前工作平面平行，大家多多发表下自己的观点啊，谢谢。

上传个示意图方便大家分析 [attachimg]2735[/attachimg]

如果是三维的测量系统就不需要，像我们用的就不需要，但是有的三次元是二维的显示系统，就必须要去投影了，比如以前英国产的老机型所配的软件，我们用的软件投影跟不投影结果都是一样的

[b]回复 [url=http://bbs.hexagonmetrology.com.cn:7080/showtopic.aspx?topicid=12535&postid=96953#96953]3楼[color=olive]qiankeming[/color]的帖子[/url][/b] 感谢你的回帖，你的意思就是平行的，不知你用的是什么软件。

PC-DMIS CAD 4.3

[b]回复 [url=http://bbs.hexagonmetrology.com.cn:7080/showtopic.aspx?topicid=12535&postid=96956#96956]5楼[color=olive]qiankeming[/color]的帖子[/url][/b] 跟我一样的。

大家有什么观点多多发帖哦！

把Workplane设置成为你想参照的平面,再测圆,下面有一个例子 圆2和平面1的矢量方向一致,因为它参照了平面1,而圆1以绝对工作坐标系为参照 [attachimg]2736[/attachimg] 平面1 =FEAT/PLANE,CARTESIAN,OUTLINE THEO/<67.067,-3.087,-8.864>,<0.2588589,0,0.9659152> ACTL/<67.067,-3.087,-8.864>,<0.2588589,0,0.9659152> MEAS/PLANE,4 HIT/BASIC,NORMAL,<41.333,56.692,-1.968>,<0.2588589,0,0.9659152>,<41.333,56.692,-1.968>,USE THEO=YES HIT/BASIC,NORMAL,<90.921,47.312,-15.257>,<0.2588589,0,0.9659152>,<90.921,47.312,-15.257>,USE THEO=YES HIT/BASIC,NORMAL,<90.599,-55.009,-15.171>,<0.2588589,0,0.9659152>,<90.599,-55.009,-15.171>,USE THEO=YES HIT/BASIC,NORMAL,<45.416,-61.345,-3.062>,<0.2588589,0,0.9659152>,<45.416,-61.345,-3.062>,USE THEO=YES ENDMEAS/ 圆1 =FEAT/CIRCLE,CARTESIAN,IN,LEAST_SQR THEO/<66.988,-0.039,-11.347>,<0,0,1>,40.525 ACTL/<66.988,-0.039,-11.347>,<0,0,1>,40.525 MEAS/CIRCLE,3,ZPLUS HIT/BASIC,NORMAL,<52.975,14.597,-8.919>,<0.6915584,-0.7223206,0>,<52.975,14.597,-8.919>,USE THEO=YES HIT/BASIC,NORMAL,<52.151,-13.839,-8.342>,<0.7322165,0.6810719,0>,<52.151,-13.839,-8.342>,USE THEO=YES HIT/BASIC,NORMAL,<87.248,-0.334,-16.778>,<-0.9998939,0.0145635,0>,<87.248,-0.334,-16.778>,USE THEO=YES ENDMEAS/ 圆2 =FEAT/CIRCLE,CARTESIAN,IN,LEAST_SQR THEO/<67.119,-0.127,-12.091>,<0.2588589,0,0.9659152>,41.346 ACTL/<67.119,-0.127,-12.091>,<0.2588589,0,0.9659152>,41.346 MEAS/CIRCLE,3,FEATURE=平面1 HIT/BASIC,NORMAL,<53.173,14.515,-7.744>,<0.6819324,-0.7082157,-0.1827534>,<53.173,14.515,-7.744>,USE THEO=YES HIT/BASIC,NORMAL,<51.826,-13.573,-8.495>,<0.7336593,0.6504508,-0.1966158>,<51.826,-13.573,-8.495>,USE THEO=YES HIT/BASIC,NORMAL,<86.658,4.005,-17.434>,<-0.9464279,-0.1998571,0.2536364>,<86.658,4.005,-17.434>,USE THEO=YES ENDMEAS/

你的这种情况是不用的

投影与不投影的结果应该是一样的。