How to Cut Threads With a Die
Cutting threads on a steel bar is a fairly easy project. You may need to do this in order to create a shaft or bolt for a special project that you can not purchase a standard bolt for. It is a good idea to practice on a few scrap pieces so that you can get the process down before trying it on the piece you are going to use.
Instructions
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1
Make sure you have the proper die. They are available in various sizes and can come in national fine (NF) or national coarse (NC) sizes. National course is generally the standard. Dies can also be metric or standard.
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2
Secure the die into the die handle. The die will usually have a flat on the outside diameter that will align with a set screw in the handle. Tightening this set screw will secure the die in the handle and keep it from turning when you are cutting the threads.
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3
Secure the steel bar into the vise. Make sure the bar is as straight up and down as possible. This will help you keep from cutting the threads on an angle.
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4
Lubricate the bar and the die with tapping fluid. The lubrication serves to keep the die teeth from dulling and ensures cleanly cut threads.
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5
Place the die on the bar and turn the handle clockwise. You will need to apply some downward force as the die begins to cut. Once a few threads have been cut, the die will draw itself down over the bar.
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Tips & Warnings
Turning the die back counter-clockwise a half turn or so after making two or three thread cuts will help to relieve steel chips that can make cutting more difficult.
If you begin cutting crooked, the die will become very difficult to advance. You may be able to start over and save the bar if you realize the error soon enough.
