Choosing the right drill bit and tap bit for tapping a hole depends on the size and material of the hole you are tapping. Generally, you should use a drill bit that is slightly smaller than the desired hole size and a tap bit that matches the thread size you need.
The correct technique for tapping a hole with both a drill bit and tap bit involves first drilling a hole with the drill bit, then using the tap bit to create threads in the hole. It is important to keep the tap bit perpendicular to the surface and to use steady, even pressure while turning the tap bit.
To prevent the tap bit from breaking, it is important to use the correct size and type of tap bit for the material you are tapping. You should also use cutting oil or lubricant to reduce friction and make the tapping process smoother. Additionally, make sure to use steady, even pressure and avoid forcing the tap bit.
While drill bits and tap bits can be used to tap a variety of materials, it is important to use the appropriate type of bit for the material you are tapping. For example, a high-speed steel bit is suitable for most metals, while a carbide bit is better for harder materials like stainless steel.
Some common mistakes to avoid when tapping a hole with both a drill bit and tap bit include using the wrong size or type of bit, not using enough lubricant, and using too much force. It is also important to make sure the tap bit is perpendicular to the surface and to avoid over-tightening the tap bit, which can cause it to break.