Alignment disks, and the creation thereof

I've been reading the now increasingly mistitled thread on alignment disks, and it's gotten me thinking. What IS required to make alignment disks? I've always aligned malfunctioning floppy drives "the wrong way", using a known good disk - or an original software disk. On the Commodore 64 (and most systems, really), you can get the drives working well enough like this, but as others have pointed out, it's not the "right way". I just don't have any alignment disks. "Good enough" is much better than "not at all", and I don't mess with the drive alignment unless I have to. I'd love to be able to align drives properly though. And that requires an alignment disk. There are different kinds of alignment disks too - analog and digital, ones that are intended to be used with a special program on a particular computer, and those intended to be used with a scope. With today's modern machining technology, it should definitely be possible to create a system to write new alignment disks. Starting with a standard floppy drive, you could replace the stepper drive with something more precise and controllable. Then, you have to somehow accurately calibrate this whole thing. Is there a document out there that describes the track layout of a standard (say, 5 1/4" 48tpi, 40 track) diskette? There has to be a spec, one that describes exactly the distance between tracks, the width of a track, and the distance from the center hub to the beginning of the first track. If you had that information, and precision measurement tools, one could set up and calibrate the drive to spec. Then, of course, there needs to be a controller for the thing, a computer interface to control the precise positioning of the head, as well as being able to read/write to the disk. It's possible. It's beyond the equipment and tools at my disposal, but it's definitely doable for a hobbyist who has access to a machine shop and good tools. Anyone out there a machinist? :) -Ian