Select the type of tap

We often use: straight groove taps, spiral groove taps, screw taps, extrusion taps, and their performance has their own advantages.

Straight groove taps are the most versatile, and can be processed through through holes or through holes, non-ferrous metals or ferrous metals, and the price is also the cheapest. But the pertinence is also poor, everything can be done, and nothing is done best. The spiral groove tap is more suitable for machining non-through-hole threads, tungsten carbide inserts and the chips are discharged backwards during processing. Due to the helix angle, the actual cutting front angle of the tap increases as the helix angle increases.

Experience tells us that the processing of ferrous metals, the spiral angle Coated Inserts is chosen to be smaller, generally around 30 degrees, to ensure the strength of the helical teeth. For the processing of non-ferrous metals, the helix angle is chosen to be a little larger, and it can be cut at about 45 degrees. When the threaded tap is threaded, the chips are discharged forward. Extrusion taps are more suitable for processing non-ferrous metals.

The Carbide Turning Inserts Blog: https://blog.goo.ne.jp/jeromephoe