@jason.fisher: I think that 3/8" is just this side of good for my arrangement. The max deflection is proportional to l^3/r^34. 24^3/.125^4=48^3/r^4 so r=.21in You need to find a lead screw with a solid core of .42in or bigger. Depending on how deep the threads are a 5/8" or 16mm or bigger screw will work. Putting the electronics up top will be great if you are going to have a heated cabinet.
@IntelliTom: Doors would be a good addition. I plan on making some removable boards that have plastic clips that snap onto the the uprights. I don't want them permanently on because it will make a much better demo piece if people can look in from all angles.
@A2: The sleeve keeps the nuts straight and probably add in a slight misalignment that removes all backlash. Without having LISA in front of me, I think that the screws are the weakest link. I would use 3/4" screws (37 times stiffer) if I was going to use this with a dremel. At that point you don't need to worry about removing weight from the hub. I would also make the arms 50% bigger or 5 times stiffer.
@cozmicray: I forgot to bring a spool holder to school so Wally got drafted. Wally was glad to help. Also, the software does account for the translation /rotation coupling of the carriages.
@IntelliTom: Doors would be a good addition. I plan on making some removable boards that have plastic clips that snap onto the the uprights. I don't want them permanently on because it will make a much better demo piece if people can look in from all angles.
@A2: The sleeve keeps the nuts straight and probably add in a slight misalignment that removes all backlash. Without having LISA in front of me, I think that the screws are the weakest link. I would use 3/4" screws (37 times stiffer) if I was going to use this with a dremel. At that point you don't need to worry about removing weight from the hub. I would also make the arms 50% bigger or 5 times stiffer.
@cozmicray: I forgot to bring a spool holder to school so Wally got drafted. Wally was glad to help. Also, the software does account for the translation /rotation coupling of the carriages.