CNC Surface Grinding machines are specialized machines that are used to grind flat and cylindrical surfaces to precise dimensions and shapes. These machines are used in a variety of industries, including aerospace, automotive, and industrial manufacturing. The best-selling CNC Surface Grinding machines can vary depending on the specific application, industry, and region. However, some popular and widely used models include:

1. Okamoto ACC-DX Series – Okamoto is a well-known brand in the CNC surface grinding industry, and their ACC-DX series machines are known for their high precision, efficiency, and versatility. They offer a wide range of models for different applications and industries.
2. Chevalier FSG-B818CNC – Chevalier is another well-known brand in the CNC surface grinding industry, and their FSG-B818CNC machines are known for their high precision and reliability. They offer a wide range of models for different applications and industries.
3. Jones & Shipman Suprema 1000 – Jones & Shipman is a well-known brand in the CNC surface grinding industry, and their Suprema 1000 machines are known for their high precision and durability. They offer a wide range of models for different applications and industries.
4. Blohm Planomat HP – Blohm is a well-known brand in the CNC surface grinding industry, and their Planomat HP machines are known for their high precision and efficiency. They offer a wide range of models for different applications and industries.
5. Studer S11 – Studer is a well-known brand in the CNC surface grinding industry, and their S11 machines are known for their high precision, productivity, and versatility. They offer a wide range of models for different applications and industries.

It’s worth noting that the best-selling CNC Surface Grinding machines also depend on the region, some brands might be more popular in one region than another. Also, the best-selling models change over time as new technologies and models are introduced, so the list above may not always be the most up-to-date.