RODCHUCK

How does it work?

The RODCHUCK system is a two pass hand machining system. On the first pass the rod diameter is threaded with the correct number of threads per inch. For example the 1/8" or .125" diameter rod is threaded with a standard die to produce 40 threads per inch with an outside diameter of .125". The second pass engages and rethreads the 40 threads per inch. In this operation the diameter of the threads are reduced to .112" or the 4-40 diameter thus completing the operation.

If you examine the two pass operation in cross section you can see that approximately half of the metal required to make the 4-40 thread on the oversized rod is removed in each pass. This insures that the die is not "tearing" the metal and ruining the thread. The same method is used for 2-56 threads on 3/32" rods.

The most critical factor in producing the threads is that the dies be held perpendicular to the rod while threading. If you do not then the threads will appear to "wobble" over their length, producing areas of poor threads. The design of the RODCHUCK die holder insures the die is held in the proper alignment during both passes.

Frequently Asked Questions

• Can I use RODCHUCK to thread music wire?

  In general no. The rule is "If you can file a flat on the material you can thread it." Music Wire is as hard as the steel in the dies and will soon dull them. However, if the ends are annealed (See tip #1) it is possible to cut a thread.

• What materials are suitable to use with RODCHUCK?

  Almost any 1/8" or 3/32" round stock is suitable as long as you can file or sand a flat on it. One of the real advantages of a custom threader is that you can choose the material. Welding rods are a good source of material and come in steel, brass, and aluminum. The important thing is to choose the rignt material for the job.

• Why are thicker rods important?

  The thicker rod provides an extra margin of safety. Often times people focus on the strength of the thread when the real danger to an airplane is the flexibility of the rod between the threads. The most likely mode of failure is a bend when the rod is under compression. The best way to protect against bending is to make sure the rods are straight, as short as possible, and have the greatest cross sectional area.

If you have a question please Email us and we will try to help.