CNC Machining Handbook by Alan Overby

Author:Alan Overby
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2011-07-16T16:00:00+00:00

G93, G94, and G95 – Set Path Control Mode

Three feed-rate modes are recognized: inverse time, units per minute, and units per revolution of spindle. Program: G93 to start the inverse time mode (this is very infrequently employed). Program: G94 to start the units per minute mode. Program: G95 to start the units per revolution mode.

In inverse time feed-rate mode, an F word means the move should be completed in (one divided by the F number) minutes. For example, if the F number is 2.0, the move should be completed in one-half minute.

In units per minute feed-rate mode, an F word on the line is interpreted to mean the controlled point should move at a certain number of inches per minute, millimeters per minute, or degrees per minute, depending upon what length units are being used and which axis or axes are moving.

In units per revolution feed-rate mode, an F word on the line is interpreted to mean the controlled point should move at a certain number of inches per spindle revolution, millimeters per spindle revolution, or degrees per spindle revolution, depending upon what length units are being used and which axis or axes are moving.

When the inverse time feed-rate mode is active, an F word must appear on every line which has a G1, G2, or G3 motion and an F word on a line that does not have G1, G2, or G3 is ignored. Being in inverse time feed-rate mode does not affect G0 (rapid traverse) motions.

It is an error if inverse time feed-rate mode is active and a line with G1, G2, or G3 (explicitly or implicitly) does not have an F word.

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