Machsupport Forum

Third party software and hardware support forums. => HiCON Motion Controller => Topic started by: fozzyber on October 29, 2025, 07:41:19 PM

Title: new conversion from mach 3 to mach4 feed rate bouncing
Post by: fozzyber on October 29, 2025, 07:41:19 PM
Hello all, I just converted from m3 to m4 with a new hicon 7866 controller.
I'm running steppers , with no feed back to the hicon,
when I'm running my feed rate display keeps changing...????
if  I  command a G01 Y60 F125 the feed rate display will bounce between something
like 124.53 to a 125.8  this seems strange to me,  why would it be changing?  also the movement is jerky I can feel it is not smooth.
Can any one explain this to me?
this evens happens even  if I use  a G61 .

Thank you
Jerry