Measuring methods for use on machine tools
First Claim
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1. A method of measuring workpieces on a machine tool, comprising the steps of:
- causing relative movement between an analogue or scanning probe and a workpiece, along a pre-defined path comprising nominal positions of the probe relative to the workpiece, under control of a part program;
during the movement, taking measurements of a position of a surface of the workpiece relative to the probe, using an output of the probe; and
combining said measurements from the output of the probe with assumed data derived from said part program.
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Abstract
On a machine tool, a program receives data from a scanning or analogue probe, measuring a feature of a workpiece. This data is combined with assumed machine position data during the scanning movement. This avoids having to break into the servo feedback loop to get actual measured machine position data. The assumed machine position data can be derived from a part program which controls the scanning movement. Several ways are described for compensating for errors between the assumed machine position values and the actual values.
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Citations
24 Claims
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1. A method of measuring workpieces on a machine tool, comprising the steps of:
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causing relative movement between an analogue or scanning probe and a workpiece, along a pre-defined path comprising nominal positions of the probe relative to the workpiece, under control of a part program; during the movement, taking measurements of a position of a surface of the workpiece relative to the probe, using an output of the probe; and combining said measurements from the output of the probe with assumed data derived from said part program. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of measuring workpieces on a machine tool, comprising the steps of:
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causing relative movement between an analogue or scanning probe and a workpiece, along a pre-defined path comprising nominal assumed first positions of the probe; during the movement, taking measurements of a workpiece surface relative to the probe, using an output of the probe; and combining said measurements from the output of the probe with data derived from the assumed first positions of the probe. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification