Circular Interpolation [Radius Specification] - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
3. Speed information
Actual operation speed (vector speed) is "X-axis operation speed 1 x X-axis override setting."
Operation speed 1 of X-axis can be changed using the operation speed change function except for operating
under the following conditions.
• During deceleration operation
• When the speed change disable during operation signal is ON.
4. Position (address) information
Absolute address and relative address can be specified in the operation information.
With the specified absolute address: Specifies a target address (position) using address 0 as the base.
With the specified relative address: Specifies a travel amount from the current address.
5. Circle information (center coordinate)
Set the center coordinate (i, j) by a relative address from a start point.

9.11.2 Circular interpolation [radius specification]

The work piece moves in a circular arc with a specified radius from the start point to the target address.
1. Operation
Big
circle (b)
Clockwise
START point
1) Set table information, X-axis speed, X/Y axis position (address) and radius in the XY table information.
2) When turning the X-axis START command ON at the table operation start number with the specified
circular interpolation (radius, CW direction) / (radius, CCW direction), the work piece moves to the target
position at the specified speed, following the circle's center coordinate calculated from the start point,
target position and radius.
3) The work piece stops at the XY coodinate in the target address 1, and the operation ends, turning the
positioning completion signal ON.
Note
• The radius is specified as r. When r is a positive value, the small circle (a) path is selected and when it is
negative, the big circle (b) path is selected.
• Pulse rate and feed rate
During the circular interpolation operation, the radius value is kept constant and pulses are allocated to the
X and Y axes. If the ratio of the pulse rate to the feed rate differs between the X-axis and Y-axis, the circle
becomes deformed.
• Use the center coordinate specification in a perfect circle operation.
• During continuous pass operation
If the circular path is too short and the travel time from the start point to the target point is shorter than the
interpolation time constant, the operation temporarily stops, and shifts to the next interpolation operation.
• When interpolation operation is continued in table operation, it becomes a continuous pass operation.
88
Speed
Target address
(X,Y axis)
Radius
-r
Small
circle (a)
Radius
+r
START command
Positioning completion
→ For details on the continuous pass operation, refer to Section 10.10
Interpolation
time constant
Maximum speed
Vector speed
(operation speed 1
of X axis)
Target address
(X,Y axis)
ON
OFF
ON
OFF
9 Positioning Control
9.11 Circular Interpolation Operation
Interpolation
time constant
ON
Time