When considering purchasing an EDM (Electrical Discharge Machining) machine, some factors to consider include:

1. The type of EDM machine best suited for the specific application, such as sinker EDM, wire EDM, or small hole EDM.
2. The workpiece material, size, and shape, as well as the required precision and surface finish.
3. The type of tooling and electrode material required.
4. The capacity of the machine’s power supply and control system, and whether it is compatible with existing equipment.
5. The size and weight of the workpiece and its suitability for the machine’s table size and load capacity.
6. The availability and cost of consumable parts such as wires, filters, and dielectric fluids.
7. The ease of programming and operation of the machine, and the availability of support and training.
8. The reputation and service network of the manufacturer.
9. The current automation and features of the machine, which are available in the market, you are looking for.
10. The overall cost and return on investment.

It is important to have clear and specific needs before making a purchasing decision, and it may be helpful to consult with an EDM professional or a application engineer from the manufacturer to evaluate the machine and its suitability for your application before making a final decision.