Classification of Taps
1. Divided by drive: hand tap and machine tap
2. Divided by processing method: cutting tap and extrusion tap
3. According to the processed thread: metric coarse tooth tap, metric fine tooth tap, pipe thread tap, etc.
4. According to its shape: straight groove taps, spiral groove taps and screw point taps.
Slotted tap
It is the most versatile. The cutting cone can have 2, 4, and 6 teeth. The short cone is used for non-through holes and the long cone is used for through holes. As long as the bottom hole is deep enough, you should try to choose a longer cutting cone, so that more teeth share the cutting load, and the service life is longer.
Spiral groove tap
It is more suitable for processing non-through-hole threads. Experience tells us that for ferrous metals, the helix angle is smaller, generally around 30 degrees, to ensure the strength of the spiral teeth. For non-ferrous metal processing, the helix angle is selected to be larger, which can be sharpened at about 45 degrees.
Tap for content shavings
Its prominent feature is to open a large enough chip flute in the head and adopt a special design to achieve higher processing quality. Especially in the processing of large threads, the advantages are significant. Widely used in wind power generation, steam turbine, shipbuilding, mining oil and other industries.
Screw point tap
Chips are ejected forward when processing the thread, and the thread of the through-hole should preferably use a screw-tap tap.
Squeeze tap
According to the use method, it is often divided into hand taps, machine taps, nut taps (for cutting threads on nut processing machine tools), die taps (for cutting and correcting die threads), pipe thread taps and tapered threads Tap.
Machine and hand taps
It is a standard tap for cutting common threads. In fact, the structure and working principle of the two are basically the same.
