Control system for sensing the air gap between a cutting...

Details Control system for sensing the air gap between a cutting... Control system for sensing the air gap between a cutting...

G - Physics

05

D

341/102, 340/135

G05D 13/62 (2006.01) B23Q 15/22 (2006.01) B23Q 17/22 (2006.01)

Patent

CA 1036695

ABSTRACT OF THE DISCLOSURE A system for sensing the air gap between a cutting tool and a work piece mounted on a machine for the purpose of controlling the traverse feed rate of the machine as contiguity approaches. A drive coil is mounted on the machine. A search coil surrounds the cutting tool in proximity to the air gap and is mutually coupled (M1) to the drive coil. A mutual inductor has first and second coils arranged so that their mutual inductance M2 is variable; these coils are connected in common at one end to a variable inductionless' resistor r. The first coil is connected series aiding with the drive coil, while the second coil is connected in series opposi- tion with the search coil. An a.c. source is connected across the drive coil, first coil and inductionless resistor. The induced voltage across the series combination of search coil, second coil, and inductionless resistor provides an output which is initially nulled by adjusting M2 and r for a selected datum displacement between cutting tool and work piece. The change in induced output voltage .DELTA.e varies in accordance with the mutual inductive M1 which changes as a function of the instantaneous displacement between the cutting tool and the work piece. The induced voltage .DELTA.e is then used to provide an adaptive voltage which serves to vary the traverse feed rate of the machine as required.

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