Plug taps: They are the smallest and used for small diameter holes.Bottoming tap: It works on threads that only halfway go via a hole.Taper tap: It is used to cut holes that travel through a hole.You just have to match the size of drill with the right characteristics. This chart refers to different drill sizes and diameters. You should also check Gantt Chart Template. Also, the size of the dies you choose should be the same as the size of rod. The dies are only applied on a round rod not a drilled hole it is the only difference between them. If you are using dies then remember that they will work in the same way. May be at first you need 3 instead of 2 turns. After making at least 2 full turns, turn the tap backwards around half or three-fourth of a turn.Press down and turn the tap inside the hole and then the tap cuts the thread in the wall of hole.Ensure that the tap is positioned in a perpendicular direction to the hole. Now, place the tip of tap inside the hole.Next, on the top of the holder, position the square and tighten it.For this, look at the tap drill chart to find the correct size and start drilling.
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