用上下单圆比较好，软件就是补偿只能是圆，这一点不好

看看,好玩吗?

[attachimg]zhangyansong@221157622047.gif[/attachimg]

谢谢版主,我懂了,也看明白了,真是太谢谢你了啊{/qiang}

大家的观点都有值得借鉴的地方,希望更多的人参与我们的讨论!

下面的程序是在3.5下的！！孔的位置度从得到的结果看。应该是孔的评价长度是孔的Z坐标到给定高度之间长度上质心的坐标。因为理论长度和实际测量的长度区别，所以不能用理论上的两个平面去截取这个长度，因为斜孔的延伸方向直接影响斜孔质心的位置，理论上的平面和实际测量的实际上的起点和终点平面有一个小小的差别，就这个孔来说，大概对位置度有0.013的区别！用实际测量平面截取两端得到的质心和位置度完全一致！至于3.7我想从这个根本上应该没有区别的。 注意下面程序中两点的Z值。 CY1 =AUTO/CYLINDER, SHOWALLPARAMS=YES, SHOWHITS=YES THEO/0,0,20,0,0,1,40,10 ACTL/-1.925,0,20,-0.1713945,-0.0000038,0.9852025,39.969,10 TARG/0,0,20,0,0,1 THEO_THICKNESS = 0, RECT, IN, STRAIGHT, LEAST_SQR, ONERROR = NO ,$ AUTO MOVE = NO, DISTANCE = 0, RMEAS = None, READ POS = NO, FIND HOLE = NO, REMEASURE = NO, USE THEO = NO ,$ NUMHITS = 4, NUMROWS = 4, INIT = 0, PERM = 0, SPACER = 0, PITCH = 0 ,$ START ANG = 0, END ANG = 360, DEPTH = 5 ,$ ANGLE VEC = 1,0,0 MEAS/CYLINDER HIT/BASIC,22,0,10,-1,0,0,22,0,5 HIT/BASIC,0,20,10,0,-1,0,0,20,5 HIT/BASIC,-20,0,10,1,0,0,-20,0,5 HIT/BASIC,0,-20,10,0,1,0,0,-20,5 HIT/BASIC,0,-20,11.667,0,1,0,0,-20,6.667 HIT/BASIC,-20,0,11.667,1,0,0,-20,0,6.667 HIT/BASIC,0,20,11.667,0,-1,0,0,20,6.667 HIT/BASIC,20,0,11.667,-1,0,0,20,0,6.667 HIT/BASIC,20,0,13.333,-1,0,0,20,0,8.333 HIT/BASIC,0,20,13.333,0,-1,0,0,20,8.333 HIT/BASIC,-20,0,13.333,1,0,0,-20,0,8.333 HIT/BASIC,0,-20,13.333,0,1,0,0,-20,8.333 HIT/BASIC,0,-20,15,0,1,0,0,-20,10 HIT/BASIC,-20,0,15,1,0,0,-20,0,10 HIT/BASIC,0,20,15,0,-1,0,0,20,10 HIT/BASIC,20,0,15,-1,0,0,20,0,10 ENDMEAS/ ASSIGN/ZD = CY1.EXYZ ASSIGN/QD = CY1.SXYZ ASSIGN/A = CY1.IJK M20 =GENERIC/PLANE,DEPENDENT,RECT,$ NOM/XYZ,QD.X,QD.Y,QD.Z,$ MEAS/XYZ,QD.X,QD.Y,QD.Z,$ NOM/IJK,A.I,A.J,A.K,$ MEAS/IJK,A.I,A.J,A.K M10 =GENERIC/PLANE,DEPENDENT,RECT,$ NOM/XYZ,ZD.X,ZD.Y,ZD.Z,$ MEAS/XYZ,ZD.X,ZD.Y,ZD.Z,$ NOM/IJK,0,0,1,$ MEAS/IJK,0,0,1 P20 =FEAT/POINT,RECT THEO/0,0,20.334,0,0,1 ACTL/-1.925,0,20,-0.1713945,-0.0000038,0.9852025 CONSTR/POINT,PIERCE,CY1,M20 P10 =FEAT/POINT,RECT THEO/0,0,10.148,0,0,1 ACTL/-0.211,0,10.148,-0.1713945,-0.0000038,0.9852025 CONSTR/POINT,PIERCE,CY1,M10 L20-10 =FEAT/LINE,RECT,UNBND THEO/0,0,20.334,0,0,-1 ACTL/-1.925,0,20,0.1713945,0.0000038,-0.9852025 CONSTR/LINE,BF,3D,P20,P10,, DIM 2= TRUE POSITION OF CYLINDER CY1 USE AXIS=AVERAGE REF LENGTH=0.000 AX NOMINAL MEAS X 0.000 -1.068 END OF DIMENSION 2 DIM 3= LOCATION OF LINE L20-10 AX NOMINAL MEAS X 0.000 -1.068 END OF DIMENSION 3 　　　　　　　　　　　　　　　　　　[此贴子已经被作者于2007-1-1 19:44:01编辑过]

位置度不一定评价的是特征质心的位置！！！我们原来一直也是这么认为的，但后来发现并非如此。3.7自动测圆柱（假定轴线方向为Z轴），Z的值不能随便定。如果 Z值为100，你打两层圆构成的圆柱轴线会一直延伸到Z=100的截面，从而得到一个交点。评价该圆孔位置度（只考虑X/y方向）时，软件就是按该点来计算的（结果与手工计算值完全一致）。所以如果你的Z正好在两层圆中间，恰好就是质心点。否则就不是。我们以前Z一直用的是默认值0（正好在我们要测圆孔的上方很远的地方）这样一来，如果供应商产品垂直度稍差，那个点就偏得很多，位置度狂差。

关于位置度的讨论这里讨论的很深入，请参考一下 http://www.hexagonmetrology.com.cn/CMM3/BBS2/forumTopicRead.asp?id=1149&ntime=2006%2D12%2D31+17%3A05%3A27 关于复合位置度的标注问题.

[COLOR=#FF33FF]象限[/COLOR]是指什么？

请您指教!