You Gotta See This

[BillTodd]

Originally Posted by vger I've been thinking (here comes trouble ) <snip> Steve

You've described something similar to a roller nut see: (I suggest you read the whole thread - re threaded rollers)

http://www.cnczone.com/forums/showthread.php?t=13593

It's a long thread (no pun intended) but essentially there are two/three types:

1 - uses threaded rollers that revolve around the screw to reduce the actual pitch (to gain resolution or mechanical advantage). Unfortunately, these can slip which reduces their usefulness in cnc work

2a) -uses threaded rollers in a recirculating 'cage' they are precision devices with similar characteristics to ball screws but allow higher loading - Unfortunately their construction is beyond most amateur machinists.

2b) uses plain grooved rollers fixed radially around the screw The rolling action allows radial or axial preload to remove backlash, with much reduced levels of friction compared to fix nuts. They are relatively easy to make if somewhat bulky.

[SORCHEROR]

looks like a great idea,my only concern is wear on the screw,being both are steel
i realize the bearing rotates with the screw but the screw still moving forward rubbing across the race of the bearing and the screw being softer will be worn eventually
any thoughts on the wear?

[NC Cams]

To add a bit, the inner race of the bearing slides or rolls wotjomg the threads of the screw. THe bearing race does NOT hop over the threads.

Any friction here becomes "so what" in light of the rolling friction reduction that is afforded by the inner ring rotating within the bearing.

[LabSkis]

Hi!
Has anyone tested this VSendas mechanism for real in this forum?
Any pictures of what you have done?
I'm really interested by this low cost 0 backlash solution!