Rotating Ballnut - design ideas

[Boyan Silyavski]

The 2788/2720/QCL7C could work i found.

Reference speed 6700 r/min
Limiting speed 10000 r/min


The ball screws and nuts best is to get them from Fred BST Automation, as he has proven himself these years. 3 weeks ago i bought Hiwin from him for 2x 3d printers and he not only gave me the best price around/ i checked just to see the market/ but i had all in 5 days here in Spain.


As far as the HTD5 rounding, Tom, you are right. I assume most of people will cut them on 4rth axis or indexing head. Anyway below pictures of the absolutely correct profile and size of the 30t puley. I have parametric model that have drawn of HTD5 so if sb say wants a 300T pulley up to specs just drop me aline and will send you a DXF. But here i include the DXF for 30T pulley, the passing hole 27mm and shaft 35mm, needed for the important part in the rotating ball nut. So you can base your drawings correctly.

[Clive S]

Boyan the zip file does not work for me. It might be the spaces in it!!

[mekanik]

+1 on that
invalid attachment.
Mike

[Boyan Silyavski]

Re-uploaded the Zip file

[njhussey]

Works fine now

[mutzy]

Hello to all. I need some advice. I finally got back to tackling the rotating ballnut. After drawing on turbocad the htd gears on th shaft that fits into the bearing box/block(Shaft with gears machined on it with head piece that attaches to the ballnut) I realized that the 7207 2rs bearings will not fit over the machined gears or the large round headpiece that attaches to the ballnut. If I just find a larger ID like 47 or 50 angular contact bearing with 80 or 90 OD, can I substitute it? Of course I'll make the bearing box accomodate it. Thanks Mutzy

[Boyan Silyavski]

Hello to all. I need some advice. I finally got back to tackling the rotating ballnut. After drawing on turbocad the htd gears on th shaft that fits into the bearing box/block(Shaft with gears machined on it with head piece that attaches to the ballnut) I realized that the 7207 2rs bearings will not fit over the machined gears or the large round headpiece that attaches to the ballnut. If I just find a larger ID like 47 or 50 angular contact bearing with 80 or 90 OD, can I substitute it? Of course I'll make the bearing box accomodate it. Thanks Mutzy

Hows that will not fit? Over no, but there is a sequence of pressing the parts together. That's why the pulley is bored from a separate pulley and then pressed together. if you machine right on shaft, then you will have to machine a smaller pulley so the bearing passes on top of it. But then the ball screwe size pass trough hole, so you will have to check if that's at all possible. I believe it was possible but not sure now. Have to check