Bench top milling machine: types, BF20 CNC

The CNC table milling machine is often used in the manufacture of small lots or single parts. So, installations have found application in manufacture of printed-circuit boards or at drawing of volumetric drawings on long sheet preparations. In the field of metal processing, the axial system creates in the automatic mode the details of the mechanisms, which saves on the purchase of spare parts.

Important points

A desktop CNC milling machine can be controlled from a conventional PC or laptop with an expansion board. Computerization of the process made it possible to quickly create a cutting program. The loaded 3D model is instantly converted into a set of G-codes, understood by the controller.

The processing suits such types of materials: stone, plastic, metal, wood. Serial multi-axis systems have the following advantages:

• Increased rigidity of the structure;
• Accuracy of tool movements;
• high performance;
• Compatibility with a wide range of electronic equipment;
• Storage of all information on the hard disk in the form of archives;
• Interchangeability of nodes, availability of spare parts in online stores;
• The ability to display the process in a graphical form with the help of programs that are freely available on the Internet.

Earlier craftsmen invented from handy materials desktop milling machine with CNC for metal. With their own hands, it turned out to make rather quick settings, capable of working with high accuracy. Manufacturers of machines took into account the needs of small-scale industry and produced miniature models.

Installation options

The average table milling machine with CNC operates with an accuracy of 0.02-0.05 mm. This allows you to produce products that are not inferior in quality to factory parts manufactured on industrial high-value machines. Additional axes on the turn of the table eliminate the need for additional technological operations. The cutter is able to select grooves in hard-to-reach places of the product.

The control program is built on the principle of a combined method, including positional and contour programming. As a result of this approach, unique in beauty figures are obtained, which do not require additional grinding and finishing. So, manufacturers use machines of shaped processing of final blanks.

Versions

A desktop CNC milling machine is executed with a horizontal spindle arrangement or with its vertical orientation. In the first case, the cutter passes only the translational motion, and the workpiece is rotational and clamped in special cams. As a result of processing, cylindrical parts come out.

In the second case, the rotating tool pierces the given grooves and holes. For an additional fee, another 2 axes are installed on the spindle, allowing you to work in 5D mode. Such a desktop CNC milling machine for metal is able to drive the cutter horizontally, changing its spatial position. However, the complication of the design leads to an increase in the cost of the installation.

One of the types of construction

The representative of the plant for small-scale production is the table milling machine with CNC BF20 CNC. Compact dimensions allow it to be located in small repair shops for cars or other equipment. The workpieces are processed from the following materials: non-ferrous and conventional metals or cast iron.

Available models are available:

• Three-axis;
• Four-axis.

The construction uses stepping motors of precise displacement. Inductive sensors are built in to determine the reference points , they also function as limit switches. The accuracy of the positioning of the tool is no more than 0.05 mm. To its own PC, the control system is connected via the USB interface.

NCdrive eco NC control controller was created in Germany. It performs G-code read processing. The coordinate table with a rigid surface has grips with the manual fastening principle. The mechanics provide the given parameters of rigidity, the screw-spiers are fixed on ball bearings. Machine bed is made of metal sheet 6 mm, power is supplied from 220 V network.