1994 Bridgeport Romi
From what I understand, when setting tool offsets the control uses the "current" position of the tool relative to the machine coordinate system and inputs the "difference" as the offset into the offset screen. This should result in typical offsets of X-12.xxxx and Z-30.xxxx. However, when I perform the facing and turing process for setting offsets and input 0 for Z and the exact Dia for X (as stated in the manual), those same values are set in the offset screen. I didn't expect this. I'm using the ABS input mode.
My manual even states that the values entered will NOT be the same as those recorded in the offset screen. I'm confused . . . . . .
Also, the maual says to use the same part Z face to determine 0 Z for all additional tools used for that job. That doesn't sound like a very accurate way to set the following Z postions as without an actual cut all you can depend on is a visual or feel "touch off". I guess I could face an additional few mils, measure the exact delta cut and input that small value for Z
Another issue, but those with hands on experience, how accurate is the jog "step" function. I seem to get erratic moves, some right on, some long and some short moving in the same direction (Z is .0005 per step is spec). Mine can be off +/- half that. Could this be a servo amp POT adjustment or just a function of the static friction and small move?
Anyway, the Bridgeport manual sucks so any help would be appreciated.