Feed Speed Specification And The Effects On Each Control Axis - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

Feed speed specification and the effects on each control axis

Control axes are divided into linear axes which control linear movement, and rotating axes which control rotational movement.
The feed speed is used to specify the displacement speed of these axes, and has different effects on the tool movement
speed when cutting depending on if controlling a linear axis or rotating axis. Also, although the displacement amount is
specified on each axis, feed speed is specified by a single value, and not specified on each axis. The following describes the
effects on each axis when interpolating two axes or more.
Controlling a linear axis
When controlling one axis only, or two or more control axes simultaneously, the feed speed specified by F is applied to the
vector speed of the tool advance direction.
■Controlling linear axis only
Ex.
Specifying the feed speed as "f", and controlling linear axes (X-axis and Y-axis)
Y
y
*1
f
Start point
When controlling linear axes only, specify the cutting speed in the program. The feed speed of each axis is the result of an
analysis of the specified feed speed in terms of movement amount.
■Controlling linear axes using circular interpolation
Ex.
Specifying the feed speed as "f", and using circular interpolation to control linear axes (X-axis and Y-axis)
The speed of the tool advance direction (tangential direction) is the feed speed specified in the program.
Y
y
Start point
In this case, the feed speed of the X-axis and Y-axis changes with the movement of the tool. However, the composite speed is
always fixed at the value "f".
End point
×
fx = f
2
x
×
fy = f
2
x
X
x *1: The speed of this direction is "f".
End point
*1
f
X
x *1: The speed of this direction is "f".
x
• • • • • X-axis feed speed
2
+ y
y
• • • • • Y-axis feed speed
2
+ y
6 AUXILIARY AND APPLIED FUNCTIONS
175
6.3 Feed Function
6