Please Help me: Looping MC repeating action

This is my first Problem. hope u can help me with this…
-: b1 = blade… rotating and moving along y axis…
its position in the stage is x = 120 and y = 20 base on its properties… but when i test it, tracing(_y) shows dat d first value comes 42.85 and not 20(value from the properties)…
i dont know how to get its exact value just like what is seen from the properties…
i’ve tried to have an if statement that if the value of _y = to the y coordinate the blade position will alter its movement(at first its _y -= 2; going down movement, id like it to alter its movement when _y turns = 90), it never turns like i want… please help me…
here is my facebook email add( punisheryuri11@gmail.com )… please help me if u have a spare time…

[FLASH 8] Need Help Please!

onClipEvent (enterFrame) {
_root.b1._y += 2;
_rotation += 30;
trace(_y);
}

i’ve erased my code co’z i know it will only distract you… sorry for being stupid :frowning: please help