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Linear motion bearings in motor spindles

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madsmadsmads

Mechanical
Nov 29, 2022
1
Hi guys. I have a question for you regarding bearing design in hig- speed motor spindles. Do you have any experience and/or ideas of where to get these linear ball-bushings installed in high-speed spindles? Please see attached pictures. These "linear guide bearings" or "ball bushings" are obviously not a standard component as far as I can gather.

I am working on a high-speed spindle assembly where we have problems with applying constant preload, and I stumbled upon this "elegant" solution, obviously fit for high-end, high-speed spindles. I am unable to find any information on these components however, as mentioned previouisly.

Looking forward to hearing from you.

Mads.
 
 https://files.engineering.com/getfile.aspx?folder=46538296-1ce3-4a30-93c8-204812806fc2&file=SKF_linear_bearing.png
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The concept isn't atypical. I see similar setups with springs used for preload on pinion gear shafts of palloid gears. The main difference in the systems I have seen is that the bearing race is clearance fit in the housing and the springs push directly on the race. I have never seen a housing mounted in a linear ball bearing. I'm guessing it gives better radial positioning as axially free cylindrical bearing fits tend to require 0.0005-0.0015" clearance. Ball bearing clearances can be much lower.
 
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