The production of CNC engraving machine is a system engineering, need mechanical and electronic aspects of knowledge, I hope you don't blindly.
To make clear of the use of engraving machine, need what kind of strength, stroke, and then set out to design, system planning, detailed production plan, to purchase the necessary material and parts.
The design process to know more about the market what accessories to buy, what is the standard parts, wearing parts and so on maintenance, and many other problems.
In addition to materials and components, but also requires a certain tool, such as electric drill, caliper, dial indicator, etc.
Affect the precision of key parts, if there is no processing conditions, the necessary processing is needed.
Anyhow, carving machine DIY though difficult, but as long as learn modestly, perseverance, don't believe in a few months time, you will also have their own CNC engraving machine.