12-17-2012, 11:19 AM
What material are the spacer made from, and exactly what kind of cutoff tool are you using? It's not uncommon for a parting operation to have variation in thickness because each cutting tool may deflect is different ways because of the variables of cutting speed, feed rate, material and tool geometry.
Back when I was running CNC screw machines, it often took several tries to get the thickness consistent. If you've only got a couple of pieces to make, consider cutting them off .005" long and machining them to final size. With a carbon steel material you could just throw them down on the mag chuck of a surface grinder and finish them all at once to the exact same size.
Or, screw them all up at the same time....not that I've ever done that. ;)
Back when I was running CNC screw machines, it often took several tries to get the thickness consistent. If you've only got a couple of pieces to make, consider cutting them off .005" long and machining them to final size. With a carbon steel material you could just throw them down on the mag chuck of a surface grinder and finish them all at once to the exact same size.
Or, screw them all up at the same time....not that I've ever done that. ;)