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CSS question
« on: January 19, 2008, 12:03:42 AM »
I'm trying to figure out the CSS mode for MachTurn and have a few
I don't normally use the CSS mode but discovered while testing a
postprocessor that I'm writing that I probably don't know how it works.

In metric, is CSS in m/min or mm/min? (ft/min for imperial)

Is the following proper to turn on CSS?

G96 S100 where 100 is the CSS in some units
G48 S3000 M3 where 3000 is the maximum rpm allowed

Is the order of the lines impoirtant?

To turn CSS off:
G97 S3000 where 3000 is an rpm I am willing to set

I've tried to piece this together from some old forum posts, but I'm
not sure how things really ended up. There is nothing in the
documentation  to help.

Thanks in advance

Offline Graham Waterworth

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Re: CSS question
« Reply #1 on: January 19, 2008, 03:39:08 PM »
Hi Terry,

G96 turns CSS on

G97 turns CSS off

G94 feed per min

G95 feed per rev

G96 uses metres or feet/min, but you also have to be in feed per rev (G95) and have spindle feed back for it to work. Feed and speed change relative to the dia been cut.

G97 is a fixed speed

As far as I know there is no G48 command, ISO g-code uses G50 Snnnn to set maximum speed, Mach3 uses G50 for scaling.  It is one thing that has been asked for but lathe always get put on the back burner, don't hold your breath.


G21 G95 (Metric feed/rev)
G96 S100 M3 (CSS at 100 metres / min)

None CSS with spindle feed back (RPM)

G21 G95 (Metric feed/rev)
G97 S1000 M3 (set to 1000 rpm)

None CSS no spindle feed back (RPM)

G21 G94 (Metric feed/min)
G97 S1000 M3 (set to 1000 rpm)

« Last Edit: January 19, 2008, 03:47:50 PM by Graham Waterworth »
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