Using latest version 3.043.066.

I am in Metric mode and feed is set to mm/min, CSS.

When I start a program the feed g-code command is ignored, and if I go to the manual screen the feed commands commands are ignored.

e.g. if the feed is set to 6.0 (default on startup) on the manual screen and I type F75.0, nothing changes. It's not the keyboard because if I type S800 then the screen setting changes to 800. Everything else works.

So after a bit of messing around I found that if I set the feed to anything below 1 then it suddenly springs to life and then I can set the feed to 75.

So:
F0.50
F75.0

works!

The same in g-code programs - if at the top I put F0.50 then the code then reads the feed commands, if i don't it ignores them.

A I doing something wrong or is it a known bug?

thanks

  
 

CSS doesnt work correctly in Mach3, I would say not to use it. Also 066 has issues, especially with Turn, so again would advise against using that version.
Also worth pointing out that G95 is the most common method of feed on a lathe.

Hood

Yes - thanks, reverting back to 057, unless you are using a different one.

G95 - oh, I'm fairly new to cnc and g-code but all the programs and code examples I've seen/been given work in mm/min.

Also i thought mm/min was the norm because in motor tuning the steppers are set in mm/min???

thanks again - much appreciated.

When using a lathe it is normal to programme in feed per rev, makes life a lot simpler as well as no matter what your spindle speed is you will just have to programme a couple of feedrates. For example I normally use 0.3mm/rev for roughing and 0.15mm/rev for finish.

I will check tomorrow and see what I am using on the lathe.

Hood

When using a lathe it is normal to programme in feed per rev, makes life a lot simpler as well as no matter what your spindle speed is you will just have to programme a couple of feedrates. For example I normally use 0.3mm/rev for roughing and 0.15mm/rev for finish.

I will check tomorrow and see what I am using on the lathe.

Hood

OK advice duly noted regarding feed per rev :-)

One thing though - what will jogging use? Will that still be set to mm/min? So will it flash between the two?

Thanks

Jogging will work as normal, its just feed moves that will be per rev.
Hood