TAILIEUCHUNG - Surface Integrity Cutting Fluids Machining and Monitoring Strategies_3

Tham khảo tài liệu 'surface integrity cutting fluids machining and monitoring strategies_3', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Machining and Monitoring Strategies 453 face - as it moves to various points on the workpiece s geometry. The tooling is held here and in effect is a cantilevered beam . the tool is normally only supported at one end only . In this situation the tooling assembly can be equated to that of boring tooling then its inherent rigidity will decrease by the cube of the stand-off distance from the gauge line 18. When a machine tool builder calibrates this orthogonal-designed machine tool they will measure along the base of the column - either optically . by for example autocollimation19 instrumentation or with laser interferometry thus feeding-back any potential error sources for CNC s dynamic compensation during execution of the part program. Nonetheless the column can either minutely twist bend or even move if its temperature varies by only just a few C. In fact it has been widely reported that up to 70 of the total errors present on a machine tool are thermally-related. On conventional machine tools - with slideways essentially one does not really know what is occurring in all of the degrees of freedom at any particular time. Although even if we did know the dynamic status unless some form of adaptive compensation system 20 was fitted to the machine having some sophisticated multiple sensors positioned on and within critical positions on the machine s structure then otherwise it would be almost impossible to compensate 18 Gauge line of the tool is the distance from where its effective length is taken specifically when the tool length compensation distance is needed for the CNC programming details. Normally this gauge line is datumed from a known point on the male spindle taper located in and standing slightly proud of its female counterpart. This measurement is either preferably set in a tool presetting machine or it can be obtained on the machine tool by some form of table-mounted touch-trigger cube. Alternatively the tool s length can also be accurately measured

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