Title:
NUMERICAL CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/1993/004817
Kind Code:
A1
Abstract:
A numerical control device capable of working with high accuracy by accurately instructing a tool feeding speed even when there are abrupt fluctuation in the actual speed of a spindle. When the number of revolutions of the spindle (4) is changed, a variation operation - storing means (12) operates a variation from the number of revolutions which has been detected and stores the same. The number of revolutions detected later by a revolution detecting means (11) is corrected by this variation, whereby a proper feeding speed is instructed by a feeding speed control means (13). When a thread cutting is performed by this numerical control device (10), a tool feeding speed is instructed in direct proportion to the actual speed of a spindle motor, and, even when the number of revolutions of the spindle motor is lowered the moment the tool starts thread cutting on a work, a moving instruction signal is output at an accurate tool feeding speed.
Inventors:
KAJIYAMA MAKOTO (JP)
Application Number:
PCT/JP1992/001116
Publication Date:
March 18, 1993
Filing Date:
September 01, 1992
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
B23G1/16; B23Q15/00; B23Q15/013; G05B19/18; G05B19/416; (IPC1-7): B23G3/00; B23Q15/00; B23Q15/013; G05D3/12
Foreign References:
| JPS63251121A | 1988-10-18 | |||
| JPS6458425A | 1989-03-06 | |||
| JPH03142131A | 1991-06-17 |
Other References:
See also references of EP 0557530A4
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