When considering buying a CNC Double Column 5 Axis Vertical Machining Center, some factors to consider include:

1. The types of materials and workpieces you will be machining: This will determine the size and weight capacity of the machine, as well as the cutting tools and tool holders required.
2. The precision and accuracy required for your workpieces: If your workpieces require high precision and accuracy, you will need to consider the machine’s spindle, motion control system, and thermal stability.
3. The machine’s size and footprint: A double column 5 axis machine is a large machine, so you’ll need to make sure you have enough space in your facility to accommodate it.
4. The machine’s controls and programming capabilities: It’s important to consider the type of control system and programming software the machine uses, and whether it’s compatible with your existing systems.
5. The machine’s available features: Consider whether the machine has additional features such as automatic tool changers, high-pressure coolant systems, or a rotary table.
6. The machine’s maintenance and cost of ownership: Consider the cost of maintenance, repair and spare parts, and the availability of service and support in your area.
7. The machine’s warranty and return policy: Make sure to understand the terms of the machine’s warranty and return policy before making a purchase.
8. The brand reputation and service support in your area: Research the reputation of the brand and the quality of their service and support in your area.
9. The machine’s flexibility: Consider whether the machine can handle different types of jobs and if it can be integrated into your existing production lines.
10. Testing the machine: It’s recommended to visit a machine tool showroom or a local distributor to test the machine and get the hands-on experience before buying.

As a CNC Double Column 5 Axis Vertical Machining Center is a high-end and complex machine, it’s important to carefully evaluate your needs and preferences before making a purchase to ensure that the machine you choose is the right fit for your business.