Boots – shoes – and leggings
Patent
1988-04-27
1990-07-10
Smith, Jerry
Boots, shoes, and leggings
36447431, 408 3, 318573, 318567, 318569, G05B 1924, B23G 104
Patent
active
049411047
ABSTRACT:
An improvement in a numerical control apparatus for controlling a threading operation with a tap. A numerical control apparatus of the present invention which is simple in construction and needs no dummy mechanism such as a floating tapper; and which minimizes the drift of the tap in the bottom of a tapped hole by an instruction to a feed shaft which switches an acceleration or deceleration time constant, and a simultaneous instruction to a spindle device which controls the position of the spindle device. Thus, the machining precision of the bottom of the tapped hole is improved, and a high-speed tapping operation is possible. Furthermore, the numerical control device also is capable of preventing the tap and the threaded portion machined by the tap from being damaged upon an occurrence of an abnormal condition by an instruction from the removing control unit.
REFERENCES:
patent: 3784798 (1974-01-01), Beadle et al.
patent: 4353018 (1982-10-01), Kohzai et al.
patent: 4629956 (1986-12-01), Nozawa et al.
patent: 4656405 (1987-04-01), Kiya et al.
patent: 4692071 (1987-09-01), Hirota
Van Nostrands Scientific Encyclopedia Definition of "Time Constant", 1968.
Konno Makoto
Teshima Takeo
Gordon Paul
Mitsubishi Denki & Kabushiki Kaisha
Smith Jerry
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