[posix]

Good or bad news first?

Well, the bad news is that no one ever told me you can't just have any thread pitch you please. It has to be one of the preset pitches on the lathe. So my 4.8mm pitch for the screw was a no-go and a show stopper.

The good news is that after a brief discussion with the master I've come to the conclusion that it would be a simple procedure of re-drawing my whole assembly with a slightly shallower thread depth in order to get a standard pitch. So 0.5mm thread depth and 3mm pitch is on the drawing board.

For example I COULD go with a 5mm pitch on the shaft but that wouldn't give me a clean number for the thread depth (0.833333333333333333) and I would end up with a non-standard pitch on the rollers (1.666666667) which, again, is a no-go. You have to end up with the same thread depth and a standard pitch on all parts.

In a few days he'll give me a ring when he's cleared up his backlog so I can come over and we can tinker all night.

Is 0.5mm enough of a thread depth? Doesn't look that substantial in my drawings that's for sure.