High-Speed Synchronous Tapping - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
6 Spindle Adjustment

6.1.6 High-speed Synchronous Tapping

This function uses high-speed communication between drive units to send compensation data from a spindle to a servo
system. The servo system uses the received data for compensation to follow the spindle position, and reduce
synchronous errors. This function can also suppress speed overshoot in cases of acceleration/deceleration at time
constants that may reach the spindle torque limit. As such, shorter time constants can be set compared to the
conventional normal synchronous tapping, and cycle times can be reduced. However, high-speed synchronous tapping
function does not guarantee higher machining accuracy than normal synchronous tapping.
(1) System Configuration
As shown in the figure on the right, the high-speed
synchronous tapping function uses the communication line
between the drive units and NC for compensating between
drive units. Also, the output and receiving of compensation
data of each drive unit is commanded from the NC.
Therefore, there are limitations in how drive units are
connected and the order of connection. The following are
cautions when using this function.
Configuration
Drive units that perform
high-speed synchronous
Optical communication
tapping are restricted to
line
axes connected with the
Connection of multiple
same optical
channels
communication line in the
same channel.
The maximum number of
The connection order
spindles that can be used
of drive units in the
in high-speed
same channel
synchronous tapping is 4.
Synchronous tapping
in G68
When any one of three base axes cannot satisfy the above specifications, this function cannot be used in
G68.
（3-dimensional
coordinate conversion）
(Note) When synchronous tapping is performed under conditions that high-speed synchronous tapping function
cannot be used, operation continues without compensation. During synchronous tapping, the status can be
confirmed with bit8 in spindle control command output 6. (0: Disabled, 1: Enabled)
High-speed Synchronous Tapping Function （OMR-DD）
M800/M80/C80 MDS-E
(1) High-speed communication between drive units
Series Servo
suppresses synchronous errors between a servo
drive unit and a spindle drive unit.
(2) Speed overshoot is suppressed when
stopping or at a hole bottom while accelerating
/decelerating at spindle maximum torque
Specification
Optical
communication
channel 2
MDS-E
Spindle
Compensation data
sending/receiving
command
Connection examples
Optical communication
channel 1
Spindle
Servo
Servo Spindle 1 Spindle 2 Spindle 3
Up to a maximum
of 4 spindles
341
Servo Spindle
Compensation
data
Compensation over different
optical communication
channels cannot be
performed
Spindle 4 Spindle 5
High-speed synchronous
tapping function cannot
be used.
IB-1501229-F