Originally Posted by forrest39  Sounds like a country song!
Actually looking for opinions or experiences setting up ballscrews without parting with too much dough. In particular I'm considering Roton products:
http://www.roton.com/Mating_Componen...family=7059321
I have seen some fancy arrangements using two ballnuts with a spring washer, but this is for an X2 mill so size is an issue. I'm guessing the preloaded ballnut is the answer.
Can anyone share their experience with using the Roton ballscrew and ballnut described above in either the original configuration (non-preloaded) or an 'upgraded' version?!?! Also if anybody has purchased a preloaded ballnut from Roton lately can you share the cost?
TIA --4ist |
A typical inexpensive "single" ballnut will have on the order of 0.005" of backlash out of the box. You can load it with oversize balls, and get that down to 0.003-0.002" (typical) or even 0.001" (if you're REALLY lucky), but you won't get to zero. Getting zero backlash requires either two nuts with spring pre-load, or a much more expensive zero backlash nut. If you don't mind up to about 0.003" of uncertainty in all your dimensions, and little "divots" in your work every time an axis changes direction a single nut will work fine. But if you need to work to 0.001" tolerance, you NEED a zero backlash nut.
Check out seller "linearmotionbearings2008" on E-Bay. He has some very nice prices on Chinese ballscrews and nuts, including zero backlash nuts, and can also machine the screws to your requirement for a reasonable price (good ballscrews are hardened to Rc60, and are VERY hard to machine!). All reports I've seen on his products here have been quite positive.
Regards,
Ray L.