Drilling a Precision Hole
There are three main concerns when drilling a hole. They are the hole size, the hole depth, and the hole quality. The type of hole is generally either a through hole or a blind hole. A through hole enters and exits the part, but a blind hole doesn’t exit the part.
When drilling a hole, the tool choice is often affected by the hole type and the precision of the hole in the part. Typically the hole is spotted or center drilled before the drill is used on the part. If the hole requires a precision tolerance on its size or location, it will often have a operation to follow up the drilling operation with other operations, which may include reaming the hole to a specific size.