When I'm parting or facing I (manually) crank up the RPMs as I approach the center of the work.? Not for the "science" of cutting as such, just so I don't have to slow the approach down a lot as I approach the center.? If you're looking at what's going on it is easy to see what's going on.? A CSS scheme could certainly help if you're committed to an automation-based approach.? Just beware that singularity when r = 0!!? Infinity is not something to mess with :)
