Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 628)

Turning Operations
Chapter 18
18-12
The control provides turning operations for single pass thread grinding.
The single pass thread grinding operating modes are enabled by
programming a G33 or a G34. G33 mode grinds straight, tapered, face,
multi-start, and multi-block threads. G34 mode grinds thread passes of
increasing or decreasing leads.
Consider these issues when performing threading operations:
Emergency Stop - Pressing the emergency stop during threading causes
all axes to come to a rapid stop. This can cause damage to the part or
grinding wheel and resumption of the threading moves is not possible.
<CYCLE STOP> (cycle suspend) - A cycle stop does not occur if this
button is pressed during a threading pass; instead axis motion continues
and cycle stop is ignored.
Overrides - During the execution of any threading pass, all feedrate
overrides are fixed at 100%.
Single Block - When performing single pass threading (G33 or G34)
motion stops at the end of the threading block, typically resulting in a
ringing of the thread.
Dry Run - Whether or not the “dry run” and spindle speed override
functions are operable during threading is determined by the system
installer’s PAL program.
Radius/Diameter Mode - The control performs threading in either
radius or diameter modes. Radius/Diameter mode only affects the
controls interpretation of the X parameter.
Start point - Due to axis acceleration and other machine dynamics,
threading passes should be programmed such that the axes have room to
attain speed prior to contacting the workpiece. Failure to do so can
result in the initial thread lead being incorrect.
18.2
Single Pass Thread Grinding
18.2.1
Considerations for Thread
Grinding