i found 1 cause of problem....as Ethos sugested to run slow from 1 position to other i did that and what a suprise,,,y axis mnotor was turning but ax was not spining,,that happened only in 1 direction and at low feedrate,,..so that explains why i got romboids instead of rectangle..and explains why some jobs didnt have problem,its cos once i did toolpath alongx and once along y......................... but today while i was doing along axis toolpath(what was good) occured problem ith z axis that i dont see while checking x axis motor and axis spining.... problem was that every time the tool had to go into material under right angle,the tool would stop(for a while but semed too long) and than entered 90 degrees down as it should..after cleaning lowr surface it was sopose to rise to z zero and continue,but just before it got to zero z level ,the x axis would start its work ,so z ax would be doing its last moves up and x axis its 1. moves..that resulted cutting an adge...it seams that z axis is "late" or x axis is few steps " a head in time"....that happens when i put like 100mm/min and its non existing at 4 times lower feed...any1 have idea whats goinng on?