We just got a new Yama Seiki Mill with the 18i-mb controller on it. We are trying to rough a id with a helix. We have tried using an edgecam program and a program that we wrote longhand. When it is running, you can watch your x and y values increase with each revolution that it makes, like it is doing a spiral. It is feeding down in the z correctly, but just wont stay on course in the x and y. This controller has conical, spiral and helical interpolation on. Anybody else had this problem?