COS LCL CTLR DESCRIBED CONFLICT BTWN IFR DEP AND VFR TFC WHEN CORRECTIVE ACTIONS WERE NOT ISSUED IN A TIMELY MANNER.

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IFR CRJ7 OFF RWY 30 GIVEN A HDG OF 350 DEGS TO SEPARATE ACFT FROM A PREVIOUS IFR OFF RWY 35L. I NOTIFIED DEP CTLR VIA AUTOMATION AND HE ACCEPTED THE INFO. I HAD ACCEPTED A POINTOUT WITH A VFR CESSNA WNW OF THE ARPT AT 8500 FT. AFTER THE CRJ7 HAD BECOME AIRBORNE A PA28 6 MI N OF THE ARPT; IN MY DEP AREA; DSNDING OUT OF 8800 FT WAS 'SHIPPED' FROM RADAR TO MY FREQ. I ISSUED TFC TO THE CHEROKEE AND THE CRJ7 WHICH WAS CLBING TO 10000 FT. WHEN I REALIZED THAT THE CRJ7'S TURN WAS GOING TO PUT HIM IN CONFLICT WITH THE CHEROKEE I GAVE THE CHEROKEE A 30 DEG TURN TO THE R FOR TFC. I EXCHANGED TFC AGAIN AND NEITHER ACFT HAD EACH OTHER IN SIGHT. IT APPEARED THAT THE CHEROKEE HAD NOT TAKEN MY TURN SO I GAVE HIM A R TURN TO 230 DEGS FOR TFC. HE QUESTIONED MY HDG AND I TOLD HIM AGAIN AND GAVE HIM TFC. HE TURNED AND RPTED THE CRJ7 IN SIGHT. DURING THIS TIME THE CRJ7 TURNED ON HIS OWN TO 010 DEGS FOR THE TFC WHICH HE DID NOT GET IN SIGHT. LESSONS LEARNED: THE RADAR CTLR SHOULD NOT HAVE HAD THE CHEROKEE IN THE DEP FAN AREA WITHOUT COORD. ESPECIALLY; SINCE HE ACKNOWLEDGED THE DEP OFF RWY 30 TURNING TO HDG 350 DEGS. ONCE THE CHEROKEE CAME OVER AND NEITHER OF THEM HAD EACH OTHER IN SIGHT I SHOULD HAVE TURNED THE CHEROKEE WESTBOUND INSTEAD OF ASSUMING THAT THEY WOULD GET EACH OTHER IN SITE. WHEN I TURNED THE CHEROKEE THE FIRST TIME I THOUGHT OF TURNING THE CRJ7 R 30 DEGS ALSO BUT DID NOT DO IT. I SHOULD HAVE TURNED THE CRJ7 WHEN IT APPEARED THAT THE CHEROKEE HAD NOT TAKEN MY HDG.