Originally Posted by
Mikeedd
Hi Stefano.
I am currently working on improving the chinese clone Hgr and ballscrews, and can tell their sizes vary quite a lot, so it is trial and error.
I just finished my hgr 20, and had to use 5/32" in -10 to -2um steps, and as there are 132 balls in each car it is a litle time consuming, but came out very well.
Now I am working on 1605 ballscrews, and plan to work up in sizes so 2005 will be next, but it takes a long time to get the right size balls, and they tend to be quite expensive in the g10 or g16 I buy, but still very cheap compared to the real ones, even hiwin.
Later I can make a thread showing how to reball and what sizes to use, but to answer your question, first measure all the balls in the screw find the biggest size and reload with a grade 10-16 of that size. if you still have play, go 2um (0.002mm) up in size, but be aware that more preload is more wear, so proceed with caution.
Good luck, Mike.