A: (from Louis Dionne): The waves that are described are a physical phenomenon called 'battement' in French. Resonnate ! That's the word in the English...sorry, long access time...
Anyway, this is a case where a small pulse at the right frequency enduce a large oscillation of a body. The frequency is determined by the rigidity, mass, material and shape of the object.
There are many ways to reduce (or eliminate this problem from your point of view). They are all based on the same principle. I don't recall the formula (20yrs ago), but if you change anything in the formula you get what you want. Well provided, you move the problem out of your scope. You can't get rid of it completely; there will be a frequency and pulse that will create resonance in your system. But as long as it is outside your operating parameters, you'll be fine.
All the following factors will affect the Resonance:
- wire speed
- wire temperature
- wire tension
- wire material
- purity of the material
- sudden change in direction.
- length of the wire
Changing the temperature is quite easy but you maybe be burning your foam is you do so. Do like I did, I increased the tension in the wire and Wwwoula. I was able to reduce by 13% the temperature for cutting and have nicer cuts. And no more waves.