Originally Posted by svenakela ....BUT, there also seems to be two different styles of production designs. One with the outer nut fixed as seen earlier in this thread, and one with the outer nut rotating, moving the axial load to the flange via roller bearings.... Sven |
There is an additional difference:
The picture attached to post #4 has a caption that reads:
"Threaded rollers are the basis of SR/BR/TR/
PR planetary toller screws."
But the link from post #22 has this description:
"What is a Spiracon® Roller Screw?
Our unique, patented Spiracon Roller Screw consists of a screw engaged by rollers which have annular grooves. Full line contact exists between the threads of the screw and the annular grooves of the roller."
For a DIY version it could be easier to do the annular roller version. It could remove the need to do precise measurements or calculations and also incorporate adjustment to remove backlash. A housing could be made to take six rollers with the bearings for the rollers axially adjustable. The adjustment is needed because annular rollers cannot all be in the same plane around the screw they have to follow the helix. Because the rollers do not have a thread but just grooves it would be fairly simple to machine samples to determine the particular diameter needed for a close fit. With six rollers all axially adjustable it would be possible to adjust three in one direction and three in the other to remove backlash.