Rust on an MXRuler is almost always the result of external contamination—typically introduced by a rusted workpiece, contaminated coolant, or poor water quality in the EDM environment. While the rulers are made from 440C stainless steel, which is highly corrosion-resistant, this material can still attract surface rust if exposed to contaminants.
It's important to note that surface rust on ground areas usually wipes off easily, indicating that it has not originated from the MXRuler itself.
Common causes of rust include:
- High pH levels in the water (too acidic) — test using a pool kit and change the water if needed.
- Use of tap water — which often contains minerals or metals; a water softener or deionized water is recommended.
- Low water resistivity (below 50k ohms) — check the condition of the deionizing bottle.
- Contaminated workpieces or materials being cut — these can introduce rust into the system and deposit it on the ruler.
To maintain performance, we recommend monitoring your water quality regularly and ensuring no rusted components enter the system.