Creating mid circle

[Underspec]

I have two circles that are concentric to eachother, one is a hole diameter, one is a stud diameter. I want to create the mid circle between the two. I haven't tried playing with this but is this possible? If you imagine a cross section of the diameters, it would be the mid line between the out and inner diameter walls.

[kmcmm]

You could do it with variables and offset points. Use variables to obtain the difference between the circles, then use the inner circle and construct offset points using half the difference between the outer circle and inner circle in each direction X+ Y+ X- Y-. Then construct a circle from the points.

[John Kingston]

This was quick n dirty. Just plugged it into a program I was working on.

            ASSIGN/V2 = ABS(CIR1.D+CIR2.D)/2
            ASSIGN/V3 = V2/2
CIR3       =GENERIC/CIRCLE,DEPENDENT,RECT,OUT,$
            NOM/XYZ,0,0,0,$
            MEAS/XYZ,0,0,0,$
            NOM/IJK,0,1,0,$
            MEAS/IJK,0,1,0,$
            RADIUS/0.755,V3
DIM D12= LOCATION OF CIRCLE CIR3  UNITS=IN ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH
AX  NOMINAL    +TOL     -TOL     MEAS    OUTTOL 
D    1.5100   0.0050   0.0050   1.5088   0.0000 #
END OF DIMENSION D12

[craiger_ny]

You can F9 that and go diameter instead of radius. Either that or divide by 4 instead of creating another variable divided by 2. I'd either make a line between the 2 or make a cylinder out of them to level to. Then translate X, Y, and Z to one circle. Assuming you're on the Z plane I'd make a generic circle half of the Z height of the second circle at X0, Y0. If you are a cylinder make the diameter the same as the cylinder if you made a line then average the diameters. I say level to a feature constructed between the 2 in case the feature is not perfectly normal to your level scenario. That way your constructed circle is perfectly between the 2 on all axis.

[tking]

It's a bit long but it will get you the location and size.

CIRCLE2 =AUTO/CIRCLE,SHOWALLPARAMS = NO,SHOWHITS = NO
THEO/0,0,3,0,0,1,17
ACTL/0,0,3,0,0,1,17
TARG/0,0,3,0,0,1
CIRCLE3 =AUTO/CIRCLE,SHOWALLPARAMS = NO,SHOWHITS = NO
THEO/0,0,3,0,0,1,35,24
ACTL/0,0,3,0,0,1,35,24
TARG/0,0,3,0,0,1
RECALL/ALIGNMENT,INTERNAL,STARTUP
A6 =ALIGNMENT/START,RECALL:A3, LIST= YES
ALIGNMENT/TRANS,XAXIS,CIRCLE2
ALIGNMENT/TRANS,YAXIS,CIRCLE2
ALIGNMENT/TRANS,ZAXIS,PNT1
ALIGNMENT/END
WORKPLANE/XPLUS
LIN1 =FEAT/LINE,RECT,UNBND
THEO/-0.5,0,0,1,0,0
ACTL/-0.5,0,0,1,0,0
CONSTR/LINE,ALIGN,1,WORKPLANE
WORKPLANE/YPLUS
LIN2 =FEAT/LINE,RECT,UNBND
THEO/0,-0.5,0,0,1,0
ACTL/0,-0.5,0,0,1,0
CONSTR/LINE,ALIGN,1,WORKPLANE
WORKPLANE/XMINUS
LIN3 =FEAT/LINE,RECT,UNBND
THEO/0.5,0,0,-1,0,0
ACTL/0.5,0,0,-1,0,0
CONSTR/LINE,ALIGN,1,WORKPLANE
WORKPLANE/YMINUS
LIN4 =FEAT/LINE,RECT,UNBND
THEO/0,0.5,0,0,-1,0
ACTL/0,0.5,0,0,-1,0
CONSTR/LINE,ALIGN,1,WORKPLANE
WORKPLANE/ZPLUS
C2_PT1 =FEAT/POINT,RECT
THEO/-8.5,0,0,1,0,0
ACTL/-8.501,0,0,1,0,0
CONSTR/POINT,PIERCE,LIN1,CIRCLE2
C3_PT1 =FEAT/POINT,RECT
THEO/-17.5,0,0,1,0,0
ACTL/-17.501,0,0,1,0,0
CONSTR/POINT,PIERCE,LIN1,CIRCLE3
MID_PT1 =FEAT/POINT,RECT
THEO/-13,0,0,0,0,1
ACTL/-12.186,0,0,0,0,1
CONSTR/POINT,MID,C3_PT1,C2_PT1
C2_PT2 =FEAT/POINT,RECT
THEO/0,-8.5,0,0,1,0
ACTL/0,-8.484,0,0,1,0
CONSTR/POINT,PIERCE,LIN2,CIRCLE2
C3_PT2 =FEAT/POINT,RECT
THEO/0,-17.5,0,0,1,0
ACTL/0,-17.484,0,0,1,0
CONSTR/POINT,PIERCE,LIN2,CIRCLE3
MID_PT2 =FEAT/POINT,RECT
THEO/0,-13,0,0,0,1
ACTL/0,-12.195,0,0,0,1
CONSTR/POINT,MID,C3_PT2,C2_PT2
C2_PT3 =FEAT/POINT,RECT
THEO/8.5,0,0,-1,0,0
ACTL/8.499,0,0,-1,0,0
CONSTR/POINT,PIERCE,LIN3,CIRCLE2
C3_PT3 =FEAT/POINT,RECT
THEO/17.5,0,0,-1,0,0
ACTL/17.499,0,0,-1,0,0
CONSTR/POINT,PIERCE,LIN3,CIRCLE3
MID_PT3 =FEAT/POINT,RECT
THEO/13,0,0,0,0,1
ACTL/12.14,0,0,0,0,1
CONSTR/POINT,MID,C3_PT3,C2_PT3
C2_PT4 =FEAT/POINT,RECT
THEO/0,8.5,0,0,-1,0
ACTL/0,8.516,0,0,-1,0
CONSTR/POINT,PIERCE,LIN4,CIRCLE2
C3_PT4 =FEAT/POINT,RECT
THEO/0,17.5,0,0,-1,0
ACTL/0,17.516,0,0,-1,0
CONSTR/POINT,PIERCE,LIN4,CIRCLE3
MID_PT4 =FEAT/POINT,RECT
THEO/0,13,0,0,0,1
ACTL/0,12.131,0,0,0,1
CONSTR/POINT,MID,C3_PT4,C2_PT4
WORKPLANE/ZPLUS
CIRCLE4 =FEAT/CIRCLE,RECT,OUT,LEAST_SQR
THEO/0,0,0,0,0,1,26
ACTL/-0.023,-0.032,0,0,0,1,24.326
CONSTR/CIRCLE,BF,MID_PT1,MID_PT2,MID_PT3,MID_PT4,,
OUTLIER_REMOVAL/OFF,3
FILTER/OFF,UPR=0

.02,

TK