Rotary Program Feed rate question

Dear Andy,
I just make it clear that as per confirmation from sheetcam, F numbers are in unit/min mode and not in inverse feed. I will start a discussion with sheetcam on how they calculate the F numbers.

Now, I have generated Gcode with feed 1250 and 2500 (mm/min) for the same job. Run both the gocode one after another. Same time is taken although F numbers in G code files are not same. Photo (video exceeds size) of computer screen is attached.

What is the correct explanation?

In addition, I increased the rotary max speed and acceleration at the cost of some microstep and run the same G code.

A axis speed changed from 2250 degree/min to 4320 degree/min and acceleration almost 25 times speed. the program run time reduced from 1 hr 9 min to 1hr 5min.

What is happening??

rajsekhar wrote:

A axis speed changed from 2250 degree/min to 4320 degree/min and acceleration almost 25 times speed. the program run time reduced from 1 hr 9 min to 1hr 5min.

What is happening?
 

Were you expecting more difference, or no difference? 

Certainly more difference.

It will tend to depend on what proportion of the time the A axis speed is the limiting factor.

It would be interesting to convert the same G-code to G93 and see what happens.

I will do that and update the result.

Actually using the same G code with G93 causes error in some cases as F number is not generated in a few lines. However, I will manually put some F number and run the same Gcode. I hope the manual editing in a few lines only will not introduce much error.