Finding exact centre of 3mm hole

Hi Can anyone tell me how to find the exact centre of a 3mm countersunk hole?

Is there a centre finder that can be purchased?

Thanks

Ian

boxmaker

There are more than one way to do this, the most common would be to use a test indicator, in the spindle & turn the spindle by hand, untill you have the X- X+ Y- Y+ at 0.0 on the indicator, another way is to use a gauge pin that is tight in the hole & indicate around the pin

HI there

are you using a cnc machining centre? fanuc controls or fanuc based controls?
i have two programmes that will find the centre of a hole using a probe and four points and another programme using 3 points. let me know if you would like it.