Machine tools, other than those specified in 2B001 or 2B201 and any combination thereof, for removing (or cutting) metals, ceramics, or ‘composites’ that, according to the manufacturer's technical specification, can be equipped with electronic devices for ‘numerical control’, having positioning accuracies of equal to or less (better) than 30 μm according to ISO 230/2 (1988) or national equivalents along any linear axis. Technical note : Manufacturers calculating positioning accuracy in accordance with ISO 230/2 (1997) should consult the competent authorities of the Member State in which they are established.

Machine tools and any combination thereof, other than those specified in 2B001, as follows, for removing or cutting metals, ceramics or “composites”, which, according to the manufacturer's technical specification, can be equipped with electronic devices for simultaneous “contouring control” in two or more axes: Technical Notes: Stated ‘positioning accuracy’ levels derived under the following procedures from measurements made according to ISO 230/2 (1988) ( 1 ) or national equivalents may be used for each machine tool model if provided to, and accepted by, national authorities instead of individual machine tests. Stated ‘positioning accuracy’ are to be derived as follows: 1. Select five machines of a model to be evaluated; 2. Measure the linear axis accuracies according to ISO 230/2 (1988) ( 1 ) ; 3. Determine the accuracy values (A) for each axis of each machine. The method of calculating the accuracy value is described in the ISO 230/2 (1988) ( 1 ) standard; 4. Determine the average accuracy value of each axis. This average value becomes the stated ‘positioning accuracy’ of each axis for the model (Âx Ây...); 5. Since Item 2B201 refers to each linear axis, there will be as many stated ‘positioning accuracy’ values as there are linear axes; 6. If any axis of a machine tool not controlled by 2B201.a., 2B201.b. or 2B201.c.. has a stated ‘positioning accuracy’ of 6 μm or better (less) for grinding machines, and 8 μm or better (less) for milling and turning machines, both according to ISO 230/2 (1988) ( 1 ) , then the builder should be required to reaffirm the accuracy level once every eighteen months. Note 1: 2B201 does not control special purpose machine tools limited to the manufacture of any of the following parts: a. Gears; b. Crankshafts or camshafts; c. Tools or cutters; d. Extruder worms. Note 2: A machine tool having at least two of the three turning, milling or grinding capabilities (e.g., a turning machine with milling capability), must be evaluated against each applicable entry 2B201.a., b. or c.

b. Machine tools for grinding, having any of the following characteristics: 1. ‘Positioning accuracies’ with “all compensations available” equal to or less (better) than 4 μm according to ISO 230/2 (1988) ( 1 ) or national equivalents along any linear axis; 2. Two or more contouring rotary axes; or 3. Five or more axes which can be coordinated simultaneously for “contouring control”; Note: 2B201.b. does not control grinding machines as follows: a. Cylindrical external, internal, and external-internal grinding machines having all of the following characteristics: 1. Limited to a maximum workpiece capacity of 150 mm outside diameter or length; and 2. Axes limited to x, z and c; b. Jig grinders that do not have a z-axis or a w-axis with an overall ‘positioning accuracy’ less (better) than 4 μm according to ISO 230/2 (1988) ( 1 ) or national equivalents. c. Machine tools for turning, that have ‘positioning accuracies’ with “all compensations available” better (less) than 6 μm according to ISO 230/2 (1988) ( 1 ) along any linear axis (overall positioning) for machines capable of machining diameters greater than 35 mm; Note: 2B201.c. does not control bar machines (Swissturn), limited to machining only bar feed thru, if maximum bar diameter is equal to or less than 42 mm and there is no capability of mounting chucks. Machines may have drilling and/or milling capabilities for machining parts with diameters less than 42 mm.

4- and 5-axis CNC machine tools

Program information