How to correctly tap hole by use both drill and tap bit

In summary, using a combined drill and tap bit is only suitable for soft sheet materials and not for deep holes or hard materials. The drill and tap should be done in one pass without backing the tap, using a cordless handheld drill and lubricating fluid. When drilling and tapping in metal, this method is only recommended for thin walls or sheet metal to prevent the threading section from shearing off. It is important for the drill part to exit the opposite side of the wall before the tap engages to avoid any issues with the threading process.
  • #1
abdulbadii
43
1
TL;DR Summary
How do we correctly tap hole by use a both drill and tap bit
How to correctly tap hole, i.e. make thread inside it, by use a usual drill with bit having 2 in 1 i.e. both bore/drill and tap bit once as in hole tap the rule is it must always go back and forth full cycle clockwise and half cycle counter-clockwise direction, so how can this rule in the former use ?
 
Engineering news on Phys.org
  • #2
The combined drill and tap is for use in soft sheet materials such as plastics, aluminium or composites. It is not designed to be used for deep holes, or for hard materials. The hole is drilled and threaded in one pass, without backing the tap. A cordless handheld drill is often used, with some form of soap or cutting fluid to lubricate the tap.
 
  • Like
Likes abdulbadii
  • #3
When drilling-tapping in metal, that type is to be used for limited thickness walls or sheetmetal.
The drill part should exit the opposite side of the wall prior to the tap part engages.
The reason is that drilling requires less advance and the tap, and the threading section can easily shear off is drilling and tapping happens simultaneously.
 

1. How do I choose the right drill bit and tap bit for tapping a hole?

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.

2. What is the correct technique for tapping a hole with both a drill bit and tap bit?

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.

3. How can I prevent the tap bit from breaking while tapping a hole?

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.

4. Can I use a drill bit and tap bit to tap any type of material?

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.

5. What are some common mistakes to avoid when tapping a hole with both a drill bit and tap bit?

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.

Similar threads

Replies
8
Views
8K
  • General Engineering
Replies
17
Views
2K
  • Mechanical Engineering
Replies
30
Views
2K
  • Astronomy and Astrophysics
Replies
12
Views
3K
  • Beyond the Standard Models
Replies
21
Views
3K
  • Mechanical Engineering
Replies
21
Views
470
  • Introductory Physics Homework Help
Replies
8
Views
1K
  • Mechanical Engineering
Replies
6
Views
1K
  • Mechanics
Replies
31
Views
739
Replies
1
Views
581
Back
Top