Hi simcro1:
If it's not the code, then it must be either in the way the machine is translating the instructions into power to the servos, or it's something mechanical that is obstructing the smooth motion of the tables even though the commands to the servos are good, or maybe it's something in the wire transport system that is boogering the smooth motion of the wire.
Your job is to figure out which it is.
I was taught by a service technician to wire cut a male octagon out of something very stable like hardened A-2, holding it with only one tab so it can be skimmed, then cut the tab below the flats on the octagon and interrogate the finished part to see whether the motion errors occur when two axes are moving together or whether there is backlash or dragging in the motion system.
An octagon is nice because it is easy to check with nothing more than a tenths clock and a surface plate.
If there are motion errors from any cause, they often tend to be different when two axes move together compared to when only one axis moves at a time, or so I was told.
They will show up as a dimensional error and a surface finish problem on the diagonals compared to the primary flats that a tenths clock will pick up.
If the finish is crap all the way around the octagon, I was told to look first at the wire transport system.
Once you've done that, and the test piece is no good, your problem is to figure out why...if dimensions across the primary flats are identical, it's not likely to be a thrust bearing or a ballscrew error because you had to reverse both axes to make it all the way around the shape.
If you get a surface finish problem on the diagonals and a dimensional problem on the diagonals but not on the primary flats, you need to dig deeper.
It can be as simple as a dragging tank seal or as complicated as a failing servomotor or drive or encoder or computer.
So do that test first, and see what you get.
Cheers
Marcus
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining
