Jeff, Gerry :
thanks for your reply, but no, the cutter diameter is 3/16" it has a micro waste after about 2000 pockets, also I changed the tool for new one... and Gerry, yes in the past I get many pockets whit exact size, the sizes of my pockets are: 5mm, 8mm, 15mm, 20mm and 34mm. in diameter, today I checked again the axis calibration ( X and Y) and the most exact aproximation was about .0005" (checked with a Starret dial indicator). the tool is a spiral 2 flutes from Onsrud.
Also, Today I make some trials doing profile circles with zero tool compensation and results were excelent (using a V tool 30 deg. 0.05mm depth). diameters were exact.
I have the feeling the trouble comes from the configuration of my Mach3.
but I can not find where do I can make the changes.
Thanks again and expecting your news...
yours Eduardo