Dual-motor-driven drilling machine and method of controlling cur

Details Dual-motor-driven drilling machine and method of controlling cur Dual-motor-driven drilling machine and method of controlling cur

1995-06-07

1996-09-24

Rachuba, M.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 11, 408 9, 408 3, B23B 3500, B23Q 1520, B23Q 1512

Patent

active

055584764

ABSTRACT:
An automatic drilling machine has an electric drilling unit on which a cylindrical cutter is rotatably mounted. The drilling machine includes a drill motor for rotating the cutter and a feed motor for linearly moving the cutter for the purpose of drilling into materials such as concrete. The current flowing through the drill motor before a drilling load is imposed thereon is detected for a microprocessor to determine the type of the cutter being used. The drill motor is driven at a rotation speed suitable for the cutter being used and the feed motor is driven at a speed such that the rotation speed of the drill motor thus set is maintained unchanged. Particularly, the drill motor is driven at a reduced rotation speed from the start of drilling until a predetermined drilling depth is reached to reduce chatter vibration which may otherwise be generated if the drill motor is driven at a regular constant speed from the beginning of drilling until the end.

REFERENCES:
patent: 3874809 (1975-04-01), Hahn et al.
patent: 4076442 (1978-02-01), Cox, Jr. et al.
patent: 4292571 (1981-09-01), Cuneo
patent: 4338556 (1982-04-01), Hetzel
patent: 4540318 (1985-09-01), Hornbug et al.
patent: 4831364 (1989-05-01), Shinohara et al.
patent: 5170358 (1992-12-01), Delio

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