Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1978-03-03
1980-01-01
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
308 10, B24B 500
Patent
active
041809467
ABSTRACT:
The tool-holding spindle assembly, particularly for a grinding machine, comprises means for supporting the shaft of the spindle and a power drive, for example an electric motor for rotating the spindle. The support means comprise at least one electromagnetic radial bearing controlled by a radial detector, having an annular armature mounted on the shaft of the spindle and a fixed armature surrounding this annular armature, an electromagnetic axial bearing having a disc-shaped armature mounted on the shaft of the spindle and a fixed armature, a chain for controlling the radial and/or axial position of the spindle, said chain being connected on the one hand to at least one detector of the radial and/or axial position of the spindle, and on the other hand to excitation coils of the armatures of each magnetic bearing, and means for selectively modifying the signal generated by said at least one position detector. This tool-holding spindle assembly makes it possible to give a rotating spindle a high speed of rotation and the desired rigidity for obtaining a very high machining precision. Further, precise displacements of the tool of limited amplitude may be controlled by modifying the detector's output signal.
REFERENCES:
patent: 3609931 (1971-10-01), Voorhies
patent: 3698775 (1972-10-01), Gilbert
patent: 3787100 (1974-01-01), Habermann
patent: 3811740 (1974-05-01), Sacerdoti
patent: 3820859 (1974-06-01), Brown
patent: 3860300 (1975-01-01), Lyman
patent: 3877761 (1975-04-01), Boden
patent: 3890019 (1975-06-01), Boden
patent: 3909082 (1975-09-01), Ishikawa
Brunet Maurice
Habermann Helmut
Hedberg Olle (Olof) J. G.
Heijkenskjold Mats C. D.
Klaassen Vello
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