Siemens SINUMERIK 840D sl Function Manual

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Extended FunctionsFunction Manual, 01/2008, 6FC5397-1BP10-3BA0 861Synchronous Spindles (S3) 1414.1 Brief description14.1.1 FunctionThe "Synchronous spindle" function can be used to couple two spindles with synchronousposition or speed. One spindle is defined as leading spindle (LS), the second spindle is thenthe following spindle (FS).Speed synchronism: n FS = k Ü * n LS , when k Ü = „1, „2, „3, ...Position synchronism: φ FS = φ LS + Δφ, when 0 o x Δφ t=360 oPossible applicationsRear side machiningOne application option is, for example, the reverse side machining in a double-spindle lathewith on-the-fly transfer of the workpiece from the position-synchronous LS to the FS (or viceversa), without having to decelerate down to standstill.Multi-edge machining (polygonal turning)The "Synchronous spindle" function provides the basis for multi-edge machining (polygonalturning) through specification of an integer gear ratio k Ü between LS and FS.Number of FSThe number of FS's that can be operated synchronously to an LS is only restricted by theperformance capability of the NC used. In principle, any number of FS can be coupledsimultaneously to an LS in arbitrary channels of the NC.Two pairs of synchronous spindles can be active simultaneously in each NC channel.DefinitionThe assignment of FS to LS pair of synchronous spindles can be parameterized channel-specifically via machine data or flexibly defined via part program commands.