Registers – Transfer mechanism – Traveling pawl
Patent
1976-01-23
1977-04-19
Butz, Eugene G.
Registers
Transfer mechanism
Traveling pawl
82 5, 318573, 318 39, B23G 304
Patent
active
040190358
ABSTRACT:
A method and apparatus are disclosed for controlling the initiation of cutting motions for cutting multiple start threads on a rotating workpiece held in a spindle of a numerically controlled machine. The numerical control contains an interpolator circuit responsive to a spindle feedback circuit connected to the spindle for generating a marker pulse and a predetermined number of spindle pulses for every revolution of the spindle. The apparatus provides input signals representing a particular threading start number relative to the total number of threading starts. Next, a control signal is generated which represents a number of spindle pulses as a function of the ratio of the particular threading start number to the total number of threading starts. Upon detecting an occurrence of a marker pulse which would normally initiate a threading motion, the apparatus is operative to inhibit a number of spindle pulses corresponding to the control signal. Subsequent spindle pulses are passed to the interpolator circuit thereby initiating the threading motion.
REFERENCES:
patent: 3854353 (1974-12-01), Cutler
Butz Eugene G.
Cincinnati Milacron Inc.
Eby C. Richard
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