Spindle state detector of air bearing machine tool

Details Spindle state detector of air bearing machine tool Spindle state detector of air bearing machine tool

1999-01-13

2000-10-31

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340680, 318571, G08B 2100

Patent

active

061409316

ABSTRACT:
An electric path (E) is formed by connecting a spindle (11), a tool (12), a table (4), a base (2), a column (5) and a housing (13) including a capacitor (C0) having the spindle (11) and the housing (13) as electrodes, and electric current is sent to the electric path (E) by a current generator (51). An electro-capacitance change is detected by measuring a current value in the electric path (E) by an electro-capacitance detector (52) to detect a state of a bearing gap between the spindle (11) and the housing (13). No multiple sensors are necessary and the spindle state detector (50) can be simplified.

REFERENCES:
patent: 3818334 (1974-06-01), Rosenberg
patent: 4353018 (1982-10-01), Kohzai et al.
patent: 4617635 (1986-10-01), Shimizu
patent: 5783887 (1998-07-01), Veyama et al.
patent: 5877408 (1999-03-01), Shiozaki et al.

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