OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 6 4 4 The feed direction is given by the direction vector es. For the convenience of reading the classifi cation formula (1), it is proposed to introduce special notation for a number of special cases (typical) of the vector es (Table 3). Ta b l e 3 Special type designations of feed direction vector No Direction of feed and method of its organization Assignment of the vector es 1 Feed along the x-axis (longitudinal) x 2 Feed along the y-axis (transverse) y 3 Feed along the z-axis (tangential) z 4 Feed in the xy plane, perpendicular to the z axis (carriage rotation) nz 5 Feed in the xz plane, perpendicular to the y axis (carriage rotation) ny 6 Feed in the yz plane, perpendicular to the x axis (carriage rotation) nx 7 Feed in the direction specifi ed by the vector in xyz space es It should be noted that according to the ISO 841–74 and GOST 23597–79 standards, the information about the X, Y, Z axes presented in Table 3–11 for CNC machines should be interpreted as X⇒Z, Y⇒X, Z⇒Y. This is because, on CNC machines, the Z axis runs along the spindle axis, while the tool’s transverse movement occurs along the X axis. Accordingly, the feeds are designated in this manner. If the feed is formed by adding coordinate feeds, it is logical to describe it through the operation of combining these feeds. So, the machining of a cone by adding the longitudinal and transverse feeds will be described as: S(x)∩S(y). As a vector ec, characterizing the location of the carriage, the radius vector of the point of the working surface of the carriage can be taken. Here it also makes sense to introduce a number of special type designations for this vector (Table 4). Ta b l e 4 Special type designations of the carriage location vector No Carriage location Carriage example Assignment of the vector ec 1 x-axis carriage Turret x 2 y-axis carriage Longitudinal on ATL and HMAL y 3 z-axis carriage Vertical on ATL z 4 –y-axis carriage Rear on ATL, carriage located on top of dual-carriage CNC machine –y 5 Carriage located in the xy plane, perpendicular to the z axis Carriage with rotation function on VMSL nz 6 Carriage located in the yz plane, perpendicular to the y axis Spindle with tools on a CNC machine ny 7 Carriage located in the yz plane, perpendicular to the x axis Transversal carriage on HMAL, spindle with tools on a CNC machine nx 8 Carriage oriented in the direction specifi ed by a vector in xyz space Spindle with tools on a CNC machine ec
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