We have recently purchased a YCM - TV158 Vertical machining center with a Fanuc MXP-200i (18-i) control.
The parts we are machining are actually larger than the machining envelope of the machine (Ø43"), so we have mounted a rotary table to the machine, and use the A-axis to generate several diameters on the parts, by positioning the tool to a fixed position, then rotating the part.
This works fine on four machines that we have here.
- however -
We are experimenting with some new tooling, and have reached a threshold of sorts...
The A axis is programmed in degrees per minute, which in and of itself is not a problem.
The problem is, as we find better and faster tooling, we are not able to program the table to rotate fast enough to give us a decent chip load.
The fastest we can program is F999.9999, which the table is capable of doing.
We can crank the override on the machine up to 200%, and the table will go right up to F1999.9998.
We know that the table is capable of considerably faster than this, but the problem we have is that the control will not allow a feedrate faster than the 3.4-digit format.
I have tried math lines, variables, and any other trick I can think of, but the control will not accept anything faster than 999.9999
(For those of you wondering, we would like to get up around 4100 degrees per minute.)
The supplier has not been able to help us on this; I have not found the right person to explain this to... it is not a question of the table's capability, it is an issue with the control accepting a 4-digit feedrate.
Is there anyone out there who knows a good way to do this? (Or for that matter, even a bad way that works right?!?!)