I appreciate the responses. I have heard of eddy current before but did not realize that it could detect under or oversized tapped holes. Thanks for the help.
The probe will work like a bolt, rotating through the hole. it will check to see if the threading is there, is undersized or not to specific depth, and if there is a damaged thread.
i'm looking to implement a new way to check tapped holes in our automotive parts produced off the machining lines. i have a good idea about how to go about this, but am not sure on what size motor to use. this motor will be powering 8 spindles that need to all spin at the same speed throughout...