Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 413

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AxisMotion
Chapter 12
12-41
Figure 12.22
Wheel Spindle Speed Modified for CSS
Partspeed (N
p
)
Part
Partdiameter
(D
p
)
Wheel speed
(N
w
)
Wheel diameter
(D
w
)
Wheel speed is
modifiedto
maintain
constant
surfacespeed
12035-I
Grinding wheel surface speeds relative to the surface of a rotating part
should be based on the specifications of the wheel and the material being
ground. Enter this surface speed in the G96 block using the S parameter.
When using CSS during part grinding, the axis perpendicular to the part
axis typically is selected as the CSS axis. CSS axis selection is described
on page 12-45.
If you want to program the wheel surface speed relative to a
stationary
part
, enter that value directly with the S parameter in the G96 block.
If you want to program actual surface speed (wheel surface speed
relative to a rotating part
), you must use t he following equation to
determine the correct value to enter with the S parameter in the G96
block. This is necessary to take into account the part rotation speed.
This equation assumes that the wheel and part are rotating into each
other (both spinning in the s ame direction).
(D
p
)(N
p
)
S
program
=S
desired
- (----------)
K
Where: Is :
S
program
Surface speed toprogramin theG96 block(m/minor feet/min)
1
S
desired
Desiredactual surface speed (m/minor feet/min)
1
D
p
Diameteratwhichpart is being ground(mmor inch)
N
p
Speedofpartwheel (rpm)
1
K
Constant318.31(1000/π) for metric systemor 3.8197 (12/π)forinch system
1
if using units of seconds, make sure all S and N values are entered in seconds
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