I am having a problem calibrating the rotary axis that uses weihong nk105 DSP. I have managed to turn the rotary axis both +- direction. But when I have tried to calibrate by altering the rotary Y axis pulse it has no effect(still turns 18 full revolutions regardless of setting). I have set the machine as follows:-

Pressed button on driver box to enable A axis.
Rotary axis valid in controller.
Tried both degrees and mm(no difference even when altered radius).
All Gcode is X for A axis(as controller wont accept A command)

I am very experienced with CNC's both professional and homemade but have no prior experience of 4th axis and value you advice. Thanks in advance.