TAPPING METHOD - FANUC LTD

Title:

TAPPING METHOD

Document Type and Number:

WIPO Patent Application WO/1985/003468

Kind Code:

A1

Abstract:

A tapping method for machining threads of a work piece by moving a tapping tool (4) to a slave position (Pe) in synchronization with the rotation of a spindle, and then inverting the spindle and drawing the tool (4) from the work synchronously with the rotation of the spindle, which method comprises the steps of (a) moving and positioning the spindle, i.e., the tapping tool (4) from the initial point (Pi) to the approach point (Pr) in the direction of depth (the Z-axis) while normally rotating the tool (4) at a constant speed, (b) then starting a distributed pulse calculation by using a pulse having a frequency proportional to the pitch of the screw and the rotating speed of the spindle to machining threads while moving the tapping tool with the pulse distributed toward the target position (Pe), (c) outputting a spindle inverting command to invert the spindle without stopping the distributed pulse calculation even if the tapping tool has arrived at the target position (Pe), moving the tapping tool in the direction of depth with the distributed pulse during normal rotation of the spindle byinertial rotation synchronously with the rotation of the spindle, (e) raising the tapping tool (4) with the distributed pulse to the approach point (Pr) after the spindle has been inverted by the piston (Pm) to finish the pulse distributed calculation after reaching the approach point (Pr).

Inventors:

KIYA NOBUYUKI (JP)
YOSHINO MOTOAKI (JP)

Application Number:

PCT/JP1985/000044

Publication Date:

August 15, 1985

Filing Date:

February 04, 1985

Export Citation:

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Assignee:

FANUC LTD (JP)

International Classes:

G05B19/18; B23G1/16; (IPC1-7): B23G1/16

Foreign References:

JPS454473Y1

1970-02-28

Other References: