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By Graham T. Smith (auth.)

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2 The Designation of Machine Tool Axes The BS3635 Part 1: 1972 and the German VOl proposal 3255 have identified CNC machine tool axes with the following three-dimensional mathematical system: X, Y and Z using upper case letters. The direction of movement along each axis is denoted by a plus (+) or minus (-) sign, from an established datum. Together with the primary axis designations, there is rotational notation around each linear axis and this is specified by A, Band C in upper case. These linear and rotational motions are illustrated in Fig.

27. A 90 tool capacity auto-toolchanger magazine (chain-type). ] ensures that an out-of-balance effect is not created in any particular area of the chain. This approach to "balanced" tool loading within the magazine can be appreciated from Fig. 27 where the large tool masses are distributed throughout each chain. If out-('f-balanced tooling occurs there is a tendency for high inertial effects to be present wi(hin the chain and this may lead to premature seizure of the chains or tools jamming. When a really large scale tooling capacity is needed - often in an FMS environment, rather than with the large "stand-alone" machining centres, then the "hive" tooling approach is often used.

This slider has etched onto its surface two windings that are displaced electrically at 90° to each other. The resulting induced signal is "resolved" in the same manner as the previous analogue method discussed for the resolver. 0025 mm and like the optical grating system discussed earlier, it finds many applications on CNC machine tools. A general 52 CNC Machining Technology > b VI o u N UJ lD UJ PHASE = ANGULAR DISPLACEMENT DISPLACEMENT. MEASUREMENT SIGNAL. 1 REVOLUTION. Fig. 43. The principle of a resolver.

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