huangyhg

Flatness - Legacy and err non legacy?
Back again folks, as confused as ever.
I'm running a large aluminium cover (Should I say aluminum?) and one feature is flatness of the face. Taking 18 hits and displaying flatness. out of curiosity, as my initial reporting showed it right on max limit, I defined the plane as a datum and used non-legacy dimensioning (Dunno what it's really called) to show drawing style and it reported a totally different result. I've enclosed the code below, and it shows my legacy flatness measured at 0.100mm, what it doesn't show is that the non-legacy style gave a measured flatness of 0.079mm.
I'm confused (As always). I've checked the help files but haven't found anything to explain this to me, and I'm now concerned that one of my methods is wrong, but which one?
Can anyone explain to me where I'm going wrong, in small words of no more than two sylables please? (Only had time for one coffee this morning)
Cheers
Code:
Code:
DATUM_FACE =FEAT/PLANE,CARTESIAN,TRIANGLE
THEO/<172.978,-80.685,2>,<0,0,1>
ACTL/<172.981,-80.68,-1.362>,<-0.0006048,-0.002509,0.9999967>
MEAS/PLANE,18
HIT/BASIC,NORMAL,<2.571,35.169,2>,<0,0,1>,<2.574,35.174,-1.226>,USE THEO=YES
HIT/BASIC,NORMAL,<2.567,-17.444,2>,<0,0,1>,<2.57,-17.44,-1.332>,USE THEO=YES
HIT/BASIC,NORMAL,<4.442,-55.024,2>,<0,0,1>,<4.445,-55.02,-1.403>,USE THEO=YES
HIT/BASIC,NORMAL,<15.705,-91.352,2>,<0,0,1>,<15.708,-91.346,-1.463>,USE THEO=YES
HIT/BASIC,NORMAL,<26.344,-111.394,2>,<0,0,1>,<26.347,-111.389,-1.496>,USE THEO=YES
HIT/BASIC,NORMAL,<54.507,-132.688,2>,<0,0,1>,<54.51,-132.682,-1.527>,USE THEO=YES
HIT/BASIC,NORMAL,<88.93,-143.959,2>,<0,0,1>,<88.932,-143.955,-1.546>,USE THEO=YES
HIT/BASIC,NORMAL,<127.735,-146,2>,<0,0,1>,<127.738,-145.996,-1.543>,USE THEO=YES
HIT/BASIC,NORMAL,<159.03,-146,2>,<0,0,1>,<159.032,-145.995,-1.536>,USE THEO=YES
HIT/BASIC,NORMAL,<192.828,-146,2>,<0,0,1>,<192.829,-145.995,-1.534>,USE THEO=YES
HIT/BASIC,NORMAL,<229.13,-138.312,2>,<0,0,1>,<229.133,-138.306,-1.496>,USE THEO=YES
HIT/BASIC,NORMAL,<261.678,-120.772,2>,<0,0,1>,<261.68,-120.767,-1.436>,USE THEO=YES
HIT/BASIC,NORMAL,<287.966,-103.859,2>,<0,0,1>,<287.968,-103.854,-1.38>,USE THEO=YES
HIT/BASIC,NORMAL,<319.262,-87.572,2>,<0,0,1>,<319.265,-87.567,-1.31>,USE THEO=YES
HIT/BASIC,NORMAL,<334.285,-65.648,2>,<0,0,1>,<334.286,-65.647,-1.239>,USE THEO=YES
HIT/BASIC,NORMAL,<334.288,-31.199,2>,<0,0,1>,<334.289,-31.194,-1.135>,USE THEO=YES
HIT/BASIC,NORMAL,<335.543,11.392,2>,<0,0,1>,<335.545,11.397,-1.004>,USE THEO=YES
HIT/BASIC,NORMAL,<336.796,38.325,2>,<0,0,1>,<336.799,38.331,-0.916>,USE THEO=YES
ENDMEAS/
DATDEF/FEATURE=DATUM_FACE,Z
FCFFLAT1 =FLATNESS OF DATUM_FACE
FEATCTRLFRAME/SHOWPARAMS=YES,SHOWEXPANDED=YES
CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,OUTPUT=BOTH,UNITS=MM
PER UNIT=NO,
DIMENSION/FLATNESS,0.1
NOTE/FCFFLAT1
FEATURES/DATUM_FACE,,
MOVE/POINT,NORMAL,<329,-8,20>
DIM FLAT1= FLATNESS OF PLANE DATUM_FACE UNITS=MM ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
M 0.000 0.100 0.000 0.100 0.100 0.000 -------#

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