finding circle multiple diameters

Hi , I have a half tone picture vector file of 1000's of circles, I need to sort the circles in to groups so I can drill on the CNC machine.

Does any one know how I can filter groups in autocad 2005 of the same diameter circles so I can attach only that diameter to a layer, i would then ceate layers of the same size circles and use to drill with the same size drill.

regards peter

You could always write a LISP for that. About how many groups of circles have the same diameter?

Try the QSELECT command.

Try this, not extensively tested

(defun c:test (/ old-layer old-cmd diam layname rad rad-dp ss1)
 (setq old-layer (getvar "clayer")
   old-cmd (getvar "cmdecho")
   );setq
 (setvar "cmdecho" 0)
 (setq diam (getreal "Enter diameter :")
   layname (strcat (rtos diam 2 2) "-DIAMETER")
   rad (/ diam 2)
   rad-dp (cons 40 rad)
   ss1 (ssget "x" (list  (cons -4 "<and")(cons 0 "circle") rad-dp (cons -4 "and>")))
     );setq
 (if
   (= ss1 nil)
   (alert "There are no circles with that diameter")
   (progn
    (command "-layer" "m" layname "")
   (command "change" ss1 "" "p" "la" layname "")
     (alert (strcat(rtos (sslength ss1)2 0) " circles have been moved to layer " layname))
     );progn
   );if
    (setvar "clayer" old-layer)
 (setvar "cmdecho" old-cmd)
 (princ)
   );defun