Practice Guide
Mirka DEROS II 625 – Professional Sanding with Comfort, Precision & Dust-Free Operation
The Mirka DEROS II 625 is one of the most modern electric random orbital sanders in its class. With its powerful 400 W motorization, optimized vibration reduction, and integrated Bluetooth function for the myMirka App, it offers professionals and workshops maximum control, ergonomics, and durability – with minimal dust exposure.
Technical Overview
| Parameter | Mirka DEROS II 625 |
|---|---|
| Power / Output | 400 W |
| Mains Voltage | 220–240 V AC |
| Speed (RPM) | 4,000–10,000 U/min |
| Orbit / Stroke | 2.5 mm |
| Backing Pad Diameter | 150 mm |
| Weight | 1.0 kg |
| Bluetooth® | Yes (myMirka App) |
Vibrations:
only $2.4\ \text{m/s}^2$ – extremely low-vibration
only $2.4\ \text{m/s}^2$ – extremely low-vibration
Volume / Noise Level:
$71\ \text{dB(A)}$ – pleasantly quiet in continuous operation
$71\ \text{dB(A)}$ – pleasantly quiet in continuous operation
Sanding Pad:
$\emptyset 150\ \text{mm}$ – optimal for large-area sanding
$\emptyset 150\ \text{mm}$ – optimal for large-area sanding
Practical Tip: When dealing with sensitive surfaces, use a soft pad and reduce the speed to max. $7,000\ \text{RPM}$ to minimize vibrations and sanding marks.
Recommended Basic Settings (Approximate Values)
- Material: Wood $\to 6,000–8,000\ \text{RPM}$
- Material: Varnish or Filler $\to 4,000–6,000\ \text{RPM}$
- Material: Metal $\to 5,000–7,000\ \text{RPM}$
- Soft Pad $\to \text{max.}\ 7,000\ \text{RPM}$
- Dust Extraction: recommended with Mirka Industrial Vacuum
Professional Workflow in 6 Steps
- Check the backing pad for a secure fit and center it.
- Select a suitable mesh abrasive (e.g., Abranet).
- Place the machine on the workpiece before the motor starts.
- Adjust the speed between $4,000–10,000\ \text{RPM}$.
- Perform the sanding motion with constant pressure.
- After sanding: Switch off the device, empty the dust container, check the abrasive.
Troubleshooting (Quick Guide)
| Problem | Cause | Solution |
|---|---|---|
| LED flashes red/green | Incorrect Mains Voltage | Check correct voltage ($220–240\ \text{V}$) |
| Device runs hot | Excessive Application Pressure | Reduce pressure, let the device cool down |
| No Function/Not Working | Plug loose | Connect cable correctly |
| Backing Pad Brake defective | Wear and Tear | Replace brake or spindle bearing |
Maintenance Recommendation
- Unplug the mains before every maintenance.
- Use only original Mirka spare parts.
- Check the backing pad regularly and replace it if necessary.
- Clean the dust shield and pad brake regularly.
- Have it checked at least annually at an authorized service center.
FAQ
- Can the DEROS II be combined with extraction? Yes, ideally with Mirka industrial vacuums via the auto-start function.
- How do I activate Bluetooth? Hold down “Speed+” while switching on until the LED flashes blue.
- What to do in case of high vibration? Check the soft pad, tighten screws according to instructions to $2\ \text{Nm}$.
- How do I clean the backing pad protector? Remove it regularly and blow it out dry.
- Are there service partners in Germany? Yes, through the Mirka service centers (www.mirka.com).
Conclusion:
The Mirka DEROS II 625 impresses with strong performance, intelligent ergonomics, and first-class dust control. A tool that shouldn't be missing in any professional workshop – from the painter to the woodworker.
