How to select a machine that meets your needs

We always need to buy machines regular or irregular. Sometimes the machine breaks down and needs to buy a new job instead of the old one, sometimes there are new projects, sometimes demand increases. Whatever it is, we all want to buy the best quality machine at the lowest price.
How can we select the right machine quickly ? If you know the following info, you can quickly determine what machine you need.
1, what your raw materials are.
2, What size are most of your raw materials are.
3, haw many tons per hour or per day you need.
4, output size you need, size and haw many sizes.
For example, your raw material is marble, most of them is about 300mm, capacity you need is 40t/h, output size you need 30mm, 40mm, 50mm
According to those info, Pe400*600 jaw crusher is suitable, and you need vibrating feeder vibrating screen belt conveyor as auxiliary equipment.