Tormach PCNC 770 - Feed Rate Mode - G93, G94 and G95

Chapter 7
124
UM10350_PCNC770_Manual_0916A
Programming
When G92 is executed, it is applied to the origins of all coordinate systems (G54-G59.3). For example,
suppose the current controlled point is at X=4 and there is currently no G92 oset acve. Then G92
X7 is programmed. This reassigns the current controlled point to X=7, eecvely moving the origin
of the acve coordinate system -3 units in X. The origins of all inacve coordinate systems also move
-3 units in X. This -3 is saved in parameter 5211.
G92 osets may be already be in eect when the G92 is called. If this is the case, the oset is
replaced with a new oset that makes the current point become the specied value. It is an error if:
• All axis words are omied
The operang system stores the G92 osets and reuses them on the next run of a program. To
prevent this, one can program a G92.1 (to erase them), or program a G92.2 (to stop them being
applied – they are sll stored).
G92.1 – Reset axis osets to zero and sets parameters 5211 - 5219 to zero
G92.2 – Reset axis osets to zero
G92.3 – Sets the axis oset to the values saved in parameters 5211 to 5219
7.6.2.11 Feed Rate Mode – G93, G94 and G95
To set the acve feed rate mode to inverse me, program: G93
Inverse me is used to program simultaneous coordinated linear and coordinated rotary moon.
In inverse me 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 half
a minute.
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.