How to Set Wire Temperature Correctly in Hot Wire Cutting
Wire temperature is not read from a manual – it is set practically at the material. Here is how.
A frequent question from beginners: what temperature should I set the wire to? The honest answer: there is no fixed value. The optimal wire temperature depends on the material, density, wire length and chosen cutting speed. That is why temperature is always set practically at the real material – never theoretically from a table.
Step by Step: How to Set the Temperature
The setting process is simple and takes only a few minutes. First: set cutting speed – use approx. 450–500 mm/min for EPS and approx. 350–400 mm/min for XPS as a starting point. Second: load material and perform a short test cut. Third: observe the cutting gap – the distance between wire and material during cutting. Fourth: adjust temperature. If the gap is smaller than approx. 2 mm, increase temperature. If larger than approx. 2 mm, reduce temperature. Repeat until the cutting gap is consistently approx. 2 mm.
The Optimal Cutting Gap: Approx. 2 mm
The cutting gap is the visible distance between the wire and the still unmelted material during cutting. The ideal value is approx. 2 mm. At this value the wire melts material away in front of it without touching it directly – the result is clean surfaces, sharp edges and high dimensional accuracy.
Cutting Speed Guidelines per Material
- EPS / Styrofoam: approx. 450–500 mm/min – good starting point for setting
- XPS / Styrodur: approx. 350–400 mm/min – slower due to different heat behaviour
- EPP: similar to EPS, adjust depending on density
- Neopor: slower than EPS – graphite content cools the wire
- Higher density: reduce speed or increase temperature
- Longer wire: higher temperature needed due to greater heat loss
Automatic Current Controller – Consistent Quality All Day
Mains voltage fluctuations can change wire temperature without the operator noticing. The result: varying cut quality throughout the day. The automatic current controller solves this problem. It regulates wire temperature using microprocessor control and automatically compensates for mains voltage fluctuations. It adapts to wire length and material. The result: consistent cut quality from morning to evening – regardless of the mains supply. From the CUT2500S the automatic current controller is standard, available as an option on smaller machines.
Common Mistakes in Temperature Setting
The most common mistake: setting temperature too high to increase cutting speed. The result is a cutting gap that is too large – material is thermally damaged, surfaces become rough and dimensional accuracy suffers. Another mistake: not readjusting temperature after a material change. Different materials and densities require different temperatures. And: no test cut before production. The test cut takes one minute and prevents an entire block becoming scrap.
Frequently Asked Questions
What temperature should I set the wire to?
There is no fixed temperature value. The optimal temperature depends on material, density, wire length and cutting speed. Always set practically at the material: perform a test cut, observe the cutting gap, adjust temperature until approx. 2 mm gap is achieved.
What is the optimal cutting gap?
The ideal cutting gap is approx. 2 mm. At this value the wire melts material away in front of it without touching it directly – clean surfaces and high dimensional accuracy result.
Why does my cut quality vary throughout the day?
Mains voltage fluctuations can change wire temperature. An automatic current controller solves this problem – it keeps temperature constant regardless of the mains supply.
Do I need to readjust temperature after a material change?
Yes. Different materials and densities require different temperatures. After every material change perform a short test cut and readjust temperature.
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