basic variable assignment for offset construct point

[KaSaBiS]

I have a tab that i need to construct a point on. cannot directly measure the point due to flash around the feature. I orginally simply measured a half circle, aligned to it (translated) offset a point by the nominal radius and was done with it. Now I see that I should have created a variable of the measured circle, then recalled the radius of the variable and use it as an offset.

I do not know exactly how to do this, but i assume that it would be more accurate than offsetting a point from a nominal radial distance.

mind the horribly crude drawing

[JEFMAN]

Did you try VAR1=CIRC1.R.MEAS ?

[KaSaBiS]

Since i have no experience working with variables, I know thus far how to assign a feature as a variable. (i did this with the circle).
would I just make a constructed point, create it as a variable, and assign its nominal position as "VAR1=CIRC1.R.MEAS"?

thanks btw

[dwade]

Since i have no experience working with variables, I know thus far how to assign a feature as a variable. (i did this with the circle).
would I just make a constructed point, create it as a variable, and assign its nominal position as "VAR1=CIRC1.R.MEAS"?

thanks btw

You don't need to create an assigned variable. Just enter the feature's attribute you want to use into your generic point then tolerance it. Many ways to skin that cat.

F1         =GENERIC/POINT,DEPENDENT,RECT,$
            NOM/XYZ,CIRC1.R.MEAS,0,0,$
            MEAS/XYZ,0,0,0,$
            NOM/IJK,0,0,1,$
            MEAS/IJK,0,0,1

or you may also need to add or subtract that features location to get what you want depending on which side of zero you are on.

F1         =GENERIC/POINT,DEPENDENT,RECT,$
            NOM/XYZ,CIRC1.X+CIRC1.RAD,0,0,$
            MEAS/XYZ,0,0,0,$
            NOM/IJK,0,0,1,$
            MEAS/IJK,0,0,1

[KaSaBiS]

I just measured a post to see the code in action and the actuals in the generic feature do not change after the circle is measured. (there is no rotate in the alignment, using machine startup alignment to recall rotate from, would that prevent actuals from showing in a generic feature?)

PLN1       =AUTO/PLANE,SHOWALLPARAMS = YES,SHOWHITS = YES
            THEO/0,0,0,0,0,1
            ACTL/0,-0.002,-0.009,0.0003556,0,0.9999999
            TARG/0,0,0,0,0,1
            THEO_THICKNESS = 0,RECT,TRIANGLE,$
            AUTO MOVE = BOTH,DISTANCE = 8,RMEAS = None,None,None,$
            NUMHITS = 3,NUMROWS = 1,SPACER = 7.5,RADIAL,$
            ANGLE VEC = 1,0,0
            MEAS/PLANE
            HIT/BASIC,7.5,0,0,0,0,1,7.5,0,-0.012
            HIT/BASIC,-3.75,6.495,0,0,0,1,-3.748,6.49,-0.008
            HIT/BASIC,-3.75,-6.495,0,0,0,1,-3.748,-6.495,-0.008
            ENDMEAS/
            MOVE/CLEARPLANE
CIR2       =AUTO/CIRCLE,SHOWALLPARAMS = NO,SHOWHITS = YES
            THEO/0,0,-0.4,0,0,1,19.07,0
            ACTL/0.029,-0.028,-0.4,0,0,1,19.034,0
            TARG/0,0,-0.4,0,0,1
            MEAS/CIRCLE
            HIT/BASIC,9.535,0,-4.4,1,0,0,9.547,-0.001,-4.399
            HIT/BASIC,2.946,9.068,-4.4,0.309,0.951,0,3.001,9.015,-4.399
            HIT/BASIC,-7.714,5.605,-4.4,-0.809,0.588,0,-7.714,5.499,-4.399
            HIT/BASIC,-7.714,-5.605,-4.4,-0.809,-0.588,0,-7.748,-5.521,-4.399
            HIT/BASIC,2.946,-9.068,-4.4,0.309,-0.951,0,3.03,-9.056,-4.399
            ENDMEAS/
TMP0       =ALIGNMENT/START,RECALL:TMP3, LIST= YES
            ALIGNMENT/LEVEL,ZPLUS,PLN1
            ALIGNMENT/TRANS,XAXIS,
            ALIGNMENT/TRANS,YAXIS,
            ALIGNMENT/TRANS,ZAXIS,PLN1
            ALIGNMENT/END
F3         =GENERIC/POINT,DEPENDENT,RECT,$
            NOM/XYZ,0,CIR2.Y-CIR2.DIAM/2,0,$
            MEAS/XYZ,0,0,0,$
            NOM/IJK,0,0,1,$
            MEAS/IJK,0,0,1

[Roberto]

What are you trying to check? Distance to the edge?

[JEFMAN]

Check your alignment...
Then, try to set actual values : generic feature work like this !
TMP0 =ALIGNMENT/START,RECALL:TMP3, LIST= YES
ALIGNMENT/LEVEL,ZPLUS,PLN1
ALIGNMENT/TRANS,XAXIS, ?
ALIGNMENT/TRANS,YAXIS, ?
ALIGNMENT/TRANS,ZAXIS,PLN1
ALIGNMENT/END
F3 =GENERIC/POINT,DEPENDENT,RECT,$
NOM/XYZ,0,CIR2.Y-CIR2.DIAM/2,0,$
MEAS/XYZ,0,CIR2.Y-CIR2.DIAM/2,0,$
NOM/IJK,0,0,1,$
MEAS/IJK,0,0,1

[Obelix]

F3 =GENERIC/POINT,DEPENDENT,RECT,$
NOM/XYZ,0,CIR2.TY-CIR2.TR,0,$
MEAS/XYZ,0,CIR2.Y-CIR2.R,0,$
NOM/IJK,0,0,1,$
MEAS/IJK,0,0,1
Add T to nominal for theoretical and use R for radius

[JamesMannes]

Can you provide a print of the datum structure and the area in question (if not the same areas of course).

[KaSaBiS]

Thanks Dwade for telling me the variable was unnecessary. Thanks Jefman for telling me that the measured value has to be keyed in as well, that was my problem. to James, this was just to lock down a method that I can apply for future scenerios.

to Obelix thanks, this tip took my example one step further and now i can get full use out of my generic points.

Add T to nominal for theoretical and use R for radius