|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
|
|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
In Reply to: Tungsten Bearings Grade 10 ?????.....anybody know ...... posted by Jose Garcia on March 22, 2002 at 10:09:07:
I wouldn't waste my money. The grade number represents spherocity in millionths. Grade 25 is spherical within 25 millionths (.000025") of an inch and grade 10 within 10 millionths (.000010") of an inch. Most balls generally produced to grade 25 spherocity exceed grade 25 spherocity tolerance and are close to grade 10. The other part of the grade spec deals with diameter tolerance. The grade 25 balls are only available in one tenth inch increments (.0001") and ball to ball variation is less than a half tenth. Grade 10 balls are avalable in smaller increments and ball to ball variation is less than .00003" or something like that. For aircraft and other critical rolling element applications the ball to ball variation is very important in a ball bearing unit, however, in a roller block set-up, you only use one ball so it by definition can't mean anything. Even ball to ball variation doesn't mean anything from roller-block to roller-block as you can't make the component or shelf level within less than .0001". Likewise, spherocity is meaninless as the ball does not rotate more than a fraction of a degree. In mass production, most balls are produced to the highest quality possible and inspected for grade 5, 10, etc. When enough grade 5s and 10s are sorted, the balance are called grade 25s and a high percentage are in fact better than grade 25. In my opinion grade 25 (which is electric motor quality) are orders of magnitude more precesion than you need.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Tungsten Bearings Grade 10 ?????.....anybody know ...... - jd 20:11:24 03/22/02 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]