Used VAM 300 SV fixed table surface grinder The used VAM 300 SV fixed table surface grinder is a surface grinder equipped with a magnetic chuck measuring 360x155mm, complete with micrometric descent. Cup wheel size Ø mm 200 Grinding wheel revolutions RPM 2800 Main grinding wheel motor Kw 3 Machine dimensions in operation MT 1.28x1x1.75H Weight Kg. 550

A surface grinder is a machine used for smoothing, polishing, and finishing flat or contoured surfaces, typically on hard materials such as metals and stones. It is primarily used in machine shops, watchmaking workshops, and goldsmiths, as well as for preparing metallographic samples. Buying a used surface grinder can be an excellent choice for several reasons. Let's take a detailed look at how it works, how to use it, the types available, the materials it can be worked with, the available alternatives, and the advantages of purchasing a used model.

### 1. **How ​​It Works**
The sander works by using an abrasive disc that rotates at high speed. The workpiece is pressed against the disc, which removes small amounts of material from the surface, smoothing or polishing it. The disc can be equipped with different types of abrasives depending on the material being treated and the desired level of finish.

### 2. **How ​​to Use**
- **Preparation**: The workpiece is clamped to a support, often with a special vice, and the appropriate abrasive disc is selected.
- **Processing**: The machine is turned on and the workpiece is pressed against the rotating disc with uniform pressure.
- **Inspection**: During processing, the surface is inspected to verify the degree of smoothing or polishing achieved.
- **Cleaning**: After use, the machine and the workpiece must be cleaned to remove any material and abrasive residue.

### 3. **Types of Surface Grinders**
- **Manual Surface Grinder**: The operator manually controls the pressure and position of the piece on the disc.
- **Semi-Automatic Surface Grinder**: Equipped with mechanisms that assist the operator in moving the piece.
- **Automatic Surface Grinder**: Fully controlled by an automatic system, programmable to perform repetitive jobs with high precision.

### 4. **Workable Materials**
- **Metals**: Steel, copper, aluminum, various alloys.
- **Stones**: Granite, marble, agate, other semi-precious stones.
- **Glass**: For sanding and polishing.
- **Composite Materials**: Such as fiberglass and similar materials.

### 5. **Alternative Machinery**
- **Grinding Machine**: Used for finishing flat and cylindrical surfaces, similar to a grinding machine but with greater precision.
- **Polisher**: Specifically designed for polishing surfaces without removing too much material, more suitable for the final stage of processing.
- **Belt Sander**: Suitable for roughing and finishing flat and curved surfaces, particularly useful for softer materials.

### 6. **Why It's Worth Buying a Used Surface Grinder**
- **Lower Cost**: Buying a used surface grinder can result in significant savings compared to a new model, reducing the initial investment.
- **Reliability**: Surface grinders are robust and durable machines; a used model, if well maintained, can offer years of efficient service.
- **Immediate Availability**: A used surface grinder can be available immediately, without the waiting time required to purchase a new machine.
- **Performance Evaluation**: A used model allows you to observe how it has performed over time, with any defects already discovered and resolved.
- **Wide Selection**: The used market offers a variety of models, from the simplest to the most sophisticated, allowing you to find the machine that best suits your needs and budget.

In conclusion, a used sander represents an economical and effective solution for those who need a reliable machine for sanding and polishing hard materials, without having to invest a large sum in a new model. However, it is essential to check the condition of the machine before purchasing to ensure it is in good working order.