Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1991-07-09
1993-11-02
Ip, Paul
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318573, 2191217, 408 35, 483 11, H02P 540, B23B 3908
Patent
active
052586987
ABSTRACT:
The device is provided on a machine tool, wherein the drilling or milling operating head (12) comprises an axially movable spindle (14) and a workpiece hold-down (17), and wherein the working depth is controlled according to the relative position of the tool (16) with respect to the hold-down (17), defined by sensing a reference member (56) by means of the tool (16). To avoid the errors due to the thermal expansion in defining the reference position between the tool and the hold-down, before the reference member (56) is sensed, an electric power supply heats the spindle (14) by sequentially energizing the phases of the statoric coil of the spindle electric motor (76). The reference member (56) comprises a proximity sensor (64) operated by the tool (16) through an air pad piston (67).
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Franciscono Giuseppe
Gaida Guido
Ottone Renato
Piovano Luigi
Ip Paul
Pluritec Italia S.p.A.
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