Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Uživatelský manuál stáhnout pdf (Strana 411)

100

101

AxisMotion

Chapter 12

12-39

Figure 12.21

Part Spindle Speed Modified for CSS

Partspeed (N

)

Part

Partdiameter

)

Wheel speed

)

Wheel diameter

)

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.

program

)(K)

= (--------------)

Where: Is :

Speedofpartwheel (rpm)

program

Surface speed programmed in theG96block(m/minor feet/min)

Constant318.31(1000/π) for metric systemor 3.8197 (12/π)forinch system

Diameteratwhichpart is being ground(mmor inch)

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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