CNC (Computer Numerical Control) machining is a subtractive manufacturing technology: parts are created by removing material from a solid block (called the blank or the workpiece) using a variety of cutting tools.
CNC machining is a digital manufacturing technology: it produces high-accuracy parts with excellent physical properties directly from a CAD file. Due to the high level of automation, CNC is price-competitive for both one-off custom parts and medium-volume productions.
Almost every material can be CNC machined. The most common examples include metals (aluminum and steel alloys, brass etc.) and plastics (ABS, Delrin, Nylon etc). Foam, composites and wood can also be machined.
The basic CNC process can be broken down into 3 steps. The engineer first designs the CAD model of the part. The machinist then turns the CAD file into a CNC program (G-code) and sets up the machine. Finally, the CNC system executes all machining operations with little supervision, removing material and creating the part.
- The workpiece is held stationary directly on the machine bed or in a vice.
- Material is removed from the workpiece using cutting tools or drills that rotate at high speed.
- The tools are attached to a spindle, which can move along three linear axes.
- The workpiece is held on the spindle while rotating at high speed.
- A cutting tool or center drill traces the outer or inner perimeter of the part, forming the geometry.
- The tool does not rotate and moves along polar directions (radially and lengthwise).
Multi-axis CNC machining centers come in three variations: 5-axis indexed CNC milling, continuous 5-axis CNC milling and mill-turning centers with live tooling.
These systems are essentially milling machines or lathes enhanced with additional degrees of freedom. For example, 5-axis CNC milling centers allow the rotation of the machine bed or the toolhead (or both) in addition to the three linear axes of movement.
The advanced capabilities of these machines come at an increased cost. They require both specialized machinery and also operators with expert knowledge. For highly complex or topology optimized metal parts, 3D printing is usually a more suitable option though.
Dakrim’s CNC facilities manufacture complex internal parts for diverse devices and clients on demand.
Our CNC facilities are capable of rapid turnaround according to the client’s timetable and requirements, whether it’s a one-off piece, tens of thousands or more, Dakrim delivers.
Dakrim has 44 CNC machining centers, 5-axis machines with work tables up to 6M long, milling, turning and grinding.
We offer our customers an advanced assembling department where systems and sub-systems design and production projects are carried out according to the customer’s requirements. The assemblies can be made in the turn-key format, including integration of sub-systems into larger technology embedded systems. We provide assembly services for the various systems we manufacture in our plant.