NC Drill Error

Hi All

In my current design, I am facing problem with NC Route generation.

In NC Drill log file, I am getting warning of " design contains 4 slot holes that can't be drilled. Can be processed by NC routing instead"

I have defined ncroutebits file with oval slot hole dimesions (least dimesion) & then tried with both X & Y dimesions.

But still I am getting error of bad hole size.......line ignored!!..

One thing more, oval slot dimesions are already drilled out in ncdrill file. X (3.0 mm ) & Y(0.5 mm ) are already defined in drill tool so do we need to define this again ?

(------------------------------------------------------------)
(                                                            )
(                    NC DRILL LOG FILE                       )
(                                                            )
(        Drawing    : YnG sensor pcb_090312.brd              )
(        Date/Time  : Fri Mar 13 11:56:29 2009               )
(                                                            )
(------------------------------------------------------------)

 Processing NC Parameters file ...

 NC PARAMETERS
 -------------

 FORMAT     5.6
 MACHINE-OFFSET  x:0.000000 y:0.000000
 FEEDRATE  1
 COORDINATES  ABSOLUTE
 OUTPUT-UNITS  METRIC
 TOOL-ORDER  INCREASING
 REPEAT-CODES  YES
 SUPPRESS-LEAD-ZEROES NO
 SUPPRESS-TRAIL-ZEROES NO
 SUPPRESS-EQUAL  NO
 TOOL-SELECT  YES
 HEADER   none
 LEADER   12
 CODE   ASCII
 SEPARATE  NO
 OPTIMIZE_DRILLING YES
 ENHANCED_EXCELLON YES
 SCALE   1.000000

 WARNING: This design contains 4 slot holes that can NOT be drilled.
          They can be processed by NC routing instead.

 WARNING: Can't find tool file (nc_tools.txt)
          ... will auto-generate tool file (nc_tools_auto.txt)

     Auto-generating tool file nc_tools_auto.txt
     -------------------------------------------

           Size  Plating  Tool        + Tolerance  - Tolerance

         0.3000  P        T01            0.000000     0.000000
         0.4000  P        T02            0.000000     0.000000
         0.5000  P        T03            0.000000     0.000000
         1.3000  P        T04            0.000000     0.000000
         3.0000  N        T05            0.000000     0.000000
         3.8000  N        T06            0.000000     0.000000
         4.0000  N        T07            0.000000     0.000000

 Drill files being output to directory '' ...

     'YnG sensor pcb_090312-1-4.drl' created for holes connecting TOP and BOTTOM
     ---------------------------------------------------------------------------

     Tool  Num     Size      +/- Tolerance     Plating   Quantity

     T01    1.   0.3000    0.0000/  0.0000      PLATED         87
     T02    2.   0.4000    0.0000/  0.0000      PLATED        115
     T03    3.   0.5000    0.0000/  0.0000      PLATED         35
     T04    4.   1.3000    0.0000/  0.0000      PLATED          6
     T05    5.   3.0000    0.0000/  0.0000  NON_PLATED          4
     T06    6.   3.8000    0.0000/  0.0000  NON_PLATED          1
     T07    7.   4.0000    0.0000/  0.0000  NON_PLATED          4

     ---- Total holes:                                        252

     ---- Total head travel:              3.69 feet (1.12 meters)

Thanks in advance.