Jim,
funny you should say that... they are plane and helicopter parts...  but   

 model plane and helicopter parts.
run the mill on the one axis using it as a power feed (will add the second axis by the end of the week) it's great 
 will change to 8 microsteps as recommended above,,,  
at this resolution, if there is a difference , you're right.... I won't care.
Thanks for your help..  the use of the spindle settings to test were invaluable to me..  I hadn't got that far up the learning curve yet.
Cheers
Adrian