Working plan 1500 x 1500 mm Year 1991 Turin collection at buyer's expense 

### How a Lapideo Works

A surface grinder is a machine tool used for grinding and finishing flat surfaces with high precision. Here are the main components and how it works:

1. **Spindle**: Mounts the grinding wheel and rotates it at high speed.
2. **Table**: Supports the workpiece and can move back and forth under the grinding wheel.
3. **Grinding Wheel**: The active part of the machine, which grinds the workpiece.
4. **Feed System**: Allows controlled movement of the table and grinding wheel to precisely grind the workpiece.
5. **Coolant System**: Used to cool the grinding wheel and workpiece during machining, preventing overheating and improving the quality of the finish.

During the operation, the workpiece is clamped on the table. The abrasive wheel, mounted on the spindle, rotates at high speed and comes into contact with the workpiece. The table moves back and forth under the wheel, while the wheel slowly advances over the workpiece to remove material and create a smooth, precise surface.

### Types of Lapidaries

1. **Tangential Surface Grinding Wheel**: The grinding wheel moves horizontally relative to the surface of the workpiece. It is the most common and versatile type, used for a wide range of surface grinding applications.
2. **Vertical Surface Grinding Wheel**: The grinding wheel moves vertically relative to the surface of the workpiece. Used for specific applications where precise vertical control is required.
3. **Rotary Surface Grinding Wheel**: The table on which the workpiece is mounted rotates beneath a fixed or movable grinding wheel. Ideal for circular workpieces or for operations requiring a uniform finish across the entire surface.
4. **Double Disc Surface Grinding Wheel**: Uses two abrasive wheels mounted on either side of the workpiece. Used to grind both sides of the workpiece simultaneously, increasing machining efficiency.

### Why It's Worth Buying a Used Lapidary

1. **Cost savings**: A new surface grinder can be very expensive. Buying a used model can save you a significant amount of money.
2. **Reduced depreciation**: Used machine tools have already suffered most of their initial depreciation, so their value remains more stable over time.
3. **Durability**: Surface grinders are built to last. A well-maintained model can continue to function effectively for many years.
4. **Access to high-quality models**: You can afford high-end models that might be out of your budget if purchased new.
5. **Immediate availability**: Used surface grinders are often available immediately, with no waiting for production or delivery.
6. **Sustainability**: Buying used is an environmentally friendly choice, reducing waste and promoting more sustainable use of resources.

### Considerations for Buying a Used Lapidary

- **Machine Condition**: Check the general condition of the surface grinder, including the spindle, grinding wheels, feed system, and coolant system.
- **Use History**: Ask about previous use and maintenance.
- **Accuracy and Tolerances**: Make sure the surface grinder maintains the required tolerances for your job.
- **Included Accessories and Tools**: Check whether the surface grinder comes with all the original equipment and accessories or if any are missing.
- **Brand and Model**: Some brands and models are known for their durability and ease of repair. Research the available models and choose those with a good reputation.

Buying a used sander can be a profitable choice, allowing you to obtain a high-quality machine at a reduced price and contributing to greater environmental sustainability.