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General Mach Discussion / mach 3 feed rate speed running faster than it should,

« on: October 11, 2014, 02:53:33 PM »

i have a problem with the feed rates in mach3 in that they run faster than they should, if i have a feed rate of 600mm per min, g1 f600, the programe screen will show a feed rate setting of 600 but the actual speed it will show that its  runing at is about   11% faster 660, also under a g0 code between cutting moves it will run aprox one third faster than the volocity set in the motor tunning, eg, with a setting of 1000 mm per min  it will run in excess of 1300, i compensate for this by slower settings in the motor tuning and slower feedrates in my programes so as to end up with the speed i want, does any one no the problem, shaun wainford  had a look at it running and looked at my setting and described it as bizare,