When it comes to creating threads with an air tool, two varieties reign supreme: the ANCO and NPT types. Both of these threads can be cut using a die set, although, an alternative tap must be taken into consideration when crafting an NPT thread.
When it comes to threads used in the US, the ANCO type is the most widespread. These threads are cut with a 60-degree angle and commence with a rounded beginning. The NPT thread variety also have a 60-degree angle, but have a tapering start.
In order to utilize either style of thread, you’ll need three essential items: a die set, a tap wrench, and some type of lubricant. The die set is composed of two separate parts -the top die fastened onto the tap wrench, and the bottom die embedded into the teeth of the tap.
The tap is twisted into the die set in a clockwise direction until it touches the lower die. Subsequently, the upper die is spun counterclockwise until it meets the workpiece. Clockwise rotation of the tap is then continued while the superior die is spun counterclockwise to further insert the tap into the workpiece.
After achieving the desired depth, twist the upper die in a clockwise motion to break the metal shavings that pile up on the tap. Subsequently, draw out the tap from the workpiece and detach the lower die.
Unlike its ANCO counterpart, the NPT tap has a taper start and requires a counterclockwise rotation of the top die. Then, turning it clockwise, the tap advances into the workpiece until touching the bottom die.
Turning the top die clockwise, the tap necessarily moves deeper into the workpiece. Once you’ve achieved the desired depth, rotate the die counterclockwise; this action breaks apart any chips that have stuck to the tap. When finished, draw the tap back out and remove the base die.
The appropriate lubrication should be utilized when creating threads with a tap tool; this lubrication can protect the tap from fractures and make it easier to dislodge it from the material being tapped.
When selecting an air tool tap, it is essential to select the one best-suited for the job at hand. Among the various varieties, each is been designed specifically to serve a specific purpose.
An air tool is the ideal instrument to swiftly cut precision threads into a workpiece. When dovetailed with accuracy, the threads procured from an air tool can be resilient and dependable.