
A-79348E
Title
Draw
No.
53/88
page
FANUC Series 30i-MODEL A
Tool center point control
for 5-axis machining
Ed. Date Design Description
Date Jan.16.’04 Design. Apprv.
Limitation
- Manual intervention
When manual intervention is made for a rotation axis while the manual
absolute switch is off, the compensation vector is calculated using the
position present before the manual intervention.
Example: When a manual intervention of 1.0 degree is made for the C-axis
which is positioned at 30.0 while the manual absolute switch is off, the
machine coordinate value of the C-axis becomes 31.0. At the start of
automatic operation after the intervention, the absolute coordinate value
of the C-axis becomes 30.0. So, the compensation vector is calculated
with C = 30.0.
- Hypothetical axis of a table rotation axis
When a table rotation axis is set as a hypothetical axis, tool center point
control is performed on the assumption that the table rotation axis is at 0
degrees.
- Deceleration at a corner
During tool center point control, the control point may move on a curved
line even if a straight line is specified. Some commands may cause the tool
center point to make a sharp turn.
For this reason, the tool may be decelerated if a small value is set as the
permissible speed difference (parameter No. 1783) or the permissible
acceleration (parameter No. 1660 or 1737) for a corner.
- Look-ahead pre-interpolation acceleration/deceleration
When using tool center point control, use look-ahead
acceleration/deceleration before interpolation as well. When look-ahead
acceleration/deceleration before interpolation is not used, an alarm (PS5420)
occurs.
For details, see the CAUTION box for "Move commands that can be
specified during tool center point control" in the section "Explanation"
Example)
Interpolation
path
Central path of the
tool center point
In the case of the example shown in the above figure, the tool moves faster
than the specified speed on the interpolation path because speed control is
exerted so that the tool center point moves at the specified speed. In such a
case, if look-ahead acceleration/deceleration before interpolation is used, the
speed is clamped so that the speed on the interpolation path may not exceed
the maximum cutting feedrate or the maximum rapid traverse rate.