Tormach PCNC 440 - 7.3.24 Spindle Control Mode - G96, G97

Chapter 7
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UM10372_PCNC440_Manual_0221A
PROgRAMMiNg
When the inverse me feed rate mode is acve, an F word must appear on every line which has a
G01, G02, or G03 moon, and an F word on a line that does not have G01, G02, or G03 is ignored.
Being in inverse me feed rate mode does not aect G00 (rapid traverse) moons.
To set the acve feed rate mode to units per minute mode, program: G94
In units per minute feed rate mode, an F word is interpreted to mean the controlled point should
move at a certain number of inches per minute, or millimeters per minute, depending upon what
length units are being used.
To set the acve feed rate mode to units per revoluon mode, program: G95
In units per revoluon mode, an F word is interpreted to mean the controlled point should move a
certain number of inches per revoluon of the spindle, depending on what length units are being
used. G95 is not suitable for threading, for threading use G33 or G76.
It is an error if:
• Inverse me feed rate mode is acve and a line with G01, G02, or G03 (explicitly or implicitly)
does not have an F word
• A new feed rate is not specied aer switching to G94 or G95 canned cycle return level – G98
and G99
7.3.24 Spindle Control Mode – G96, G97
To set constant surface speed mode, program: G96 D~ S~
Word Definition
D~ Maximum spindle RPM. This word is oponal
S~
Surface speed. If G20 is acve mode, the value is interpreted as feet per minute.
If G21 is acve mode, the value is interpreted as meters per minute
Example:
G96 D2500 S250 (set constant surface speed with a maximum rpm of 2500 and a surface speed
of 250).
It is an error if:
• S is not specied with G96
• A feed move is specied in G96 mode while the spindle is not turning
When using G96 (the most common mode of mill operaon), X0 in the current coordinate system
(including osets and tool lengths) must be the spindle axis.
To set RPM mode, program: G97