Electrical Discharge Machining (EDM) Die-Sinking machines are specialized CNC machines that are used to create complex shapes and geometries by using electrical discharge to remove material from a workpiece. The best-selling EDM Die Sinking machines can vary depending on the specific application, industry, and region. However, some popular and widely used models include:

1. Mitsubishi EDM – Mitsubishi is a well-known brand in the EDM industry, and their EDM machines are known for their high precision, efficiency, and versatility. They offer a wide range of models for different applications and industries.
2. Sodick EDM – Sodick is another well-known brand in the EDM industry, and their EDM machines are known for their high precision and reliability. They offer a wide range of models for different applications and industries.
3. Charmilles EDM – Charmilles is a well-known brand in the EDM industry, and their EDM machines are known for their high precision and durability. They offer a wide range of models for different applications and industries.
4. Fanuc EDM – Fanuc is a well-known brand in the CNC industry, and their EDM machines are known for their high precision and efficiency. They offer a wide range of models for different applications and industries.
5. Makino EDM – Makino is a well-known brand in the EDM industry, and their EDM machines are known for their high precision and productivity. They offer a wide range of models for different applications and industries.

It’s worth noting that the best-selling EDM Die Sinking 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.