Fagor 8055i FL EN - Page 68

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Operating manual
CNC 8055
CNC 8055i
2.
OPERATING IN JOG MODE
·TC· OPTION
SOFT: V02.2X
Spindle control
5. Maximum spindle speed in rpm.
To select another speed, press the [S] key twice. The CNC highlights the current value. Enter
the new value and press [ENTER]. The CNC assumes this value and does not allow the spindle
to exceed these rpm.
The maximum spindle speed is saved in the MDISL variable. This variable is updated (refreshed)
changing the SMAX value and when programming function "G92 S" via ISO.
6. Spindle gear currently selected.
This value cannot be changed when using an automatic gear change.
When not using an automatic tool changer, press the [S] key and then use the [] key to highlight
the current value. Enter the gear number to be selected and press [ENTER] or [START].
Working at constant surface speed mode
When selecting the constant surface speed mode, the CNC assumes the spindle gear (range) that
is currently selected. The following cases may occur in this mode, when selecting a new constant
surface speed value:
• The spindle is stopped.
The CNC selects the new speed, but it does not apply it until the starts turning.
• The spindle is running.
The CNC, depending on the position of the axis, calculates and turns the spindle at the
corresponding rpm so the constant surface speed is the one defined.
The following cases may occur when moving the axes when working at constant surface speed:
• The spindle is running.
The CNC moves the axes at the programmed F.
As the X axis moves, the CNC adapts the spindle speed (rpm) to maintain the selected constant
speed. Thus, if the tool tip gets away from the rotation axis, the spindle slows down and if it gets
closer, it speeds up.
The CNC limits the spindle rpm to the maximum speed set by "SMAX".
• The spindle is stopped, but a spindle speed S has been selected.
The CNC calculates the feedrate F in mm/min for the last programmed S and moves the axis.
For example if «F 2.000» and «S 500»:
Feedrate = F (mm/rev) x S (rev/min) = 2 x 500 = 1000 mm/min.
The axis moves at a feedrate of 1000 mm/min.
• The spindle is stopped and no spindle speed S has been selected.
If F = 0, the CNC moves the axes in rapid.
When the machine does not use spindle gears, this message makes no sense. That is why the CNC
does not show this message when text 28 of program 999997 has not been defined.
i
If F is other than 0, the axes can only be moved by pressing the rapid key and an axis
key. The CNC moves the axis in rapid.