
AxisMotion
Chapter 12
12-39
Figure 12.21
Part Spindle Speed Modified for CSS
Partspeed (N
p
)
Part
Partdiameter
(D
p
)
Wheel speed
(N
w
)
Wheel diameter
(D
w
)
Partspeed ismodified to
maintain constantsurface
speed
12034-I
Use the following equation to determine part speed in RPM when CSS is
active. This equation is for reference only. The value obtained here is
calculated automatically by the control and there is no need to program it.
(S
program
)(K)
N
p
= (--------------)
D
p
Where: Is :
N
p
Speedofpartwheel (rpm)
1
S
program
Surface speed programmed in theG96block(m/minor feet/min)
1
K
Constant318.31(1000/π) for metric systemor 3.8197 (12/π)forinch system
D
p
Diameteratwhichpart is being ground(mmor inch)
1
if using units of seconds, make sure all S and N values are entered in seconds
Since the wheel spindle is not controlled by the S--word, grinding wheel
surface speeds relative to a stationary wheel dresser cannot be held
constant using CSS. Instead the wheel spindle speed should be a
compromise speed (in RPM) that best accommodates the variations in
surface speed as the wheel is dressed at different diameters.
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