Bi directional positional tolerancing

[Towndogg]

I have a elongated hole in one of our products. There are two FCF's assigned to this hole. They control position-- and they are perpendicular to each other. In two dimensional terms, the tolerance zone can be the same as rectangular.
No diameter symbol is given in the discription of the FCF, but maximum material conditions are given in both FCF's for this elongated hole.

My question is, does one FCF control the dimension in "X" and the other control the dimension in "Y"? If this is correct, do you take the square root of "X squared" and multiply it by 2? Do I get bonus in both directions or in one direction of the elongated hole for calculating "X"?

Towndogg
3.7

[tking]

Yes, each is for 1 axis, one for the width (get the bonus from the width) and one for the length (bonus from the length). Use the true pos function and select the appropriate axis.

TK

[inspector212]

Position the DF in 'X' and the LF in '"Y" or vise versa. Do the following to get bonus on the LF

Position to the Length of a Slot
 
1.       Add slot to program
 
           SLOT1      =AUTO/ROUND SLOT,SHOWALLPARAMS = YES,SHOWHITS = NO
                      THEO/0,-35,0.001,-1,0,0,11,16,0,-1,0.00018
                      ACTL/0,-35,0.001,-1,0,0,11,16,0,-1,0.00018
                                   TARG/0,-35,0.001,-1,0,0,0,-1,0.00018
                        THEO_THICKNESS = 0,RECT,IN,ONERROR = YES,$
                        AUTO MOVE = BOTH,DISTANCE = 10,RMEAS = None,None,None,$
                        READ POS = YES,FIND HOLE = NO,REMEASURE = NO,$
                        INIT = 3,PERM = 3,SPACER = 3,DEPTH = 1,HITS = 18,MEAS ANGLE =                              160
 
2.       After slot, hit enter and type “GEN” and hit Tab once. Change name to SLOT1L. Hit Tab once and F7 until feature changes to CIRCLE. Hit Tab three times and change OUT to IN. F9 the Generice feature and change from RADIUS to DIAMETER. Hit OK. Change underlined areas to what is below. T = Theoretical, LF = Length of Feature
 
           SLOT1L     =GENERIC/CIRCLE,DEPENDENT,RECT,IN,$
                                   NOM/XYZ,SLOT1.TX,SLOT1.TY,SLOT1.TZ,$
                                   MEAS/XYZ,SLOT1.X,SLOT1.Y,SLOT1.Z,$
                                   NOM/IJK,SLOT1.TI,SLOT1.TJ,SLOT1.TK,$
                                   MEAS/IJK,SLOT1.I,SLOT1.J,SLOT1.K,$
                                   DIAMETER/SLOT1.TLF,SLOT1.LF
 
3.       Position the slot as below:
 
a)      Position to the width of a slot
 
           DIM LOC1= TRUE POSITION OF SLOT SLOT1  UNITS=MM ,$
           GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
           AX    MEAS      NOMINAL     +TOL       -TOL       BONUS       DEV      OUTTOL   
           Z      -9.057        -9.000                                                                  0.057           
           DF     11.000     11.000      0.350      0.200      0.200      0.000      0.000 -#-
           TP                   MMC      2.000                 0.200      0.000      0.104 #--
           END OF DIMENSION LOC1
 
b)      Position to the length of a slot
 
           DIM LOC2= TRUE POSITION OF CIRCLE SLOT1L  UNITS=MM ,$
           GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
           AX    MEAS      NOMINAL     +TOL       -TOL       BONUS       DEV      OUTTOL   
           Y     -33.807       -33.800                                                               0.007           
           DF     16.000     16.000      0.350      0.200      0.200      0.000      0.000 -#-
           TP                   MMC      4.000                 0.200      0.000      0.014 #--
           END OF DIMENSION LOC2

[Wingman]

Insp 212 assumes you can do an Auto Round Slot. If you don't have CAD++ you cannot. You will need to create two circles (one of the diameter equal to length and the other of diameter equal to width) and use them respectively to get bonus tolerance IF you do not have CAD++

[Rob_K]

I have same case here; it looks both of FCFs takes care of their own dimension; a bit of help here : www.tec-ease.com/tips/august-00.htm