Unless you include an F statement in the init string then Mach3 does NOT have a default feedrate .

(;-) TP

thanks BR540- seems that is what is causing my concern

the configuration is set a 25000 and when i look at the diags the reported speed is 23800( or thereabouts)

could this be the cause ?

This whole problem has led to me doing quite a lot of research and for anyone else who
may be interested in the topis take a look at  "Google Mach3 feedrate " ther are many posts about the same thing.

thank you all very much - i think this answers my queries.

regards from South africa

Br549-- a last question
I am not calling css in the code but the initstring is using "constant velocity"

Is this the same thing - any wat i have changed it to exact stop to see what happens

regards

fred

I don't know, but there seems to be something lurking in the depths of the code ... a few days ago, my feedrate changed suddenly from 70 mm/min to 1000 mm/min and couldn't be changed with the f word. A reboot fixed that, but not the tool  

If that's now good or bad, that this was a one-of-a-kind-accident ...?

Hello Stephan--
When I changed to f per minute the problem went away and I was able to
finish the job i was on .
Then I had a gearbox failure so I havent used the machine for the last week
or so.
Please keep us informed
regards

fred