Rotary Program Feed rate question

The attached file is the G code generated using sheetcam, post processor= mach3 rotary. (Linux XZA is not working).

Now, there is feed rate in every G01 line and it changes.

Why??

Greetings,

Refer to this link to see if it answers your question.

linuxcnc.org/docs/html/gcode/g-code.html#gcode:g93-g94-g95

Using the A-Axis of my machine (mill XYZA), I need to have a feedrate on each line when using G93.

Cheers,

Dave

Dear Friends,

I am presently running my machine rotary axis.

Now a g-code is attached. G93 is there in the Gcode.

Point 1: When I run the code, G93 is not active at least not showing in Gcode list of the window, rather G94 is showing there (photo attached). Why??

Point 2: Again even if G94 is working, the feed shows 3000 in all lines and velocity 625 in all lines. Why??  The program has different feed of 1000,1250,1500,1750,2000,2250,2500,2750,3000 in different lines.

Taking the points in reverse order

linuxcnc.org/docs/stable/html/gcode/g-co...ml#gcode:g93-g94-g95

G93 requires an F number on every motion line.
Also, F-numbers on non-motion lines are ignored.

The status box shows interpreter state. Often the interpreter will have already finished before the motion even starts. M2 resets to G94, so if the interpreter has finished and queued the M2 it will show G94.

If you add a probe move into the code you will probably see the status show G93 until that is complete.

Interpreter status info is only really useful when the machine is not currently running g-code.

Thanks to Andypugh for the reply, it really helped.

I had contacted Sheetcam and it was confirmed that Feed is in G94 in rotary.

Question 1:
why there is feed in every line? what is the calculation at the back for the F numbers generated?
My operation feed is 2500 and job diameter=63.

Question 2:

How LinuxCNC is interpreteing the F numbers? 
I have seen velocity values in the range 50 to 500 or so on while program runs. It crosses 1000  only when Z is in G00 or ramping. Overall same drawing produce much lower speed in XZA mode compared to XYZ mode with same operation feed.

Why??

rajsekhar wrote:

why there is feed in every line?

Because it is almost certain that every line will be a different path length.

How LinuxCNC is interpreteing the F numbers? 

As it says in the docs, it is a measure of the time (in minutes) that the line should take to execute.
Except that, for historical reasons (on early controls F-numbers were integers) it is 1/time.

F=1 -> move takes 1 minute
F=2 -> move takes 0.5 minutes, 30 seconds
F=0.5 -> move takes 2 minutes