Table of Contents

Tapping Operation | Formula , Types , Tapping Process

Tapping Operation :

Tapping is the operation of cutting internal threads in a hole using a cutting tool called Tap. A tap has cutting edges in the shape of threads. When the tap is screwed into a hole it removes metal and cuts internal threads for tapping the hole
drilled will be smaller than the tap size.

Tap drill size = 0.8 * Outer diameter of the threads

例如，对于M8尺寸轻敲，钻头尺寸应为= 0.8 * 8 = 6.8 mm

To understand the application and importance of the involvement of semi automation in conventional drilling machine in manufacturing.

阅读更多：钻孔机|.面试问题和答案

Types Of Tapping Process

Tapping may be done by:

– hand
– lathe machine
– milling machine
- 攻丝机

HAND TAPPING PROCEDURE

1 Select drill size from chart.

选择点击尺寸时，此图表是第一个要查看的地方。

Tapping Drill Size Calculation

2. If necessary, add chamfer to the hole before tapping.Chamfers and countersinks are additional features that are sometimes desired for screws. For best results, the speed of the spindle should be between 150 and 250 rpm.

3. Get a tap guide.The hole is now ready to tap. To do this, use the taps and guide blocks near the manual mills. The guide blocks will have several holes for different sized taps. Select the one closest to the size of the tap being used and place it over the drilled hole.

4. Tap the block.Peck tap using the tap wrenches. Apply gentle pressure while turning the wrench a complete turn in, then a half-turn out. Peck tap to the desired depth.

5. Complete the tap.If the tap does not go any further or the desired depth has been reached, release pressure on the tap; it has likely bottomed out. Remove the tap from the hole.