1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. PLEASE: Read the FORUM RULES BEFORE registering!

    Dismiss Notice

Needle Bearing Fit Question

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by ddickey, Aug 28, 2017.

  1. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

    Likes Received:
    443
    Trophy Points:
    63
    City:
    Red Wing
    State:
    Minnesota

    -Return to Top-

    How are needle bearings supposed to fit?
    I need to replace two. Low load and speed. It's for a table on a small surface grinder. They fit tight in the housing but the shaft is a loose fit,
     
  2. Desolus

    Desolus United States H-M Supporter - Premium Content H-M Supporter-Premium

    Likes Received:
    64
    Trophy Points:
    28
    City:
    fort worth
    State:
    Texas

    -Return to Top-

    There's quite alot of needle bearings out there, you will need to give some more information. I've seen bearings held in a housing by everything from glue to a, well come to think of I don't know what it's called... like a reverse e-clip...

    Pictures if possible.
     
  3. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

    Likes Received:
    443
    Trophy Points:
    63
    City:
    Red Wing
    State:
    Minnesota

    -Return to Top-

    They're open cup full complement I think they're called. I've installed them. Made a new shaft as the old one was worn .003" from the OD. I did some searching and thought I read for my size 1/2" x 11/16" x 1/2" shaft diameter could be .001" larger so .501" in my case.
     
  4. benmychree

    benmychree United States John York H-M Supporter-Premium

    Likes Received:
    488
    Trophy Points:
    83
    City:
    Saint Helena
    State:
    California

    -Return to Top-

    The shaft should fit with very little clearance; soft shaft and needle bearings is a very poor thing to do; ideally the shaft should have a hard race on it or the shaft should be hardened.
     
    Ulma Doctor likes this.
  5. Asm109

    Asm109 United States Iron Registered Member

    Likes Received:
    9
    Trophy Points:
    3
    City:
    Poway
    State:
    California

    -Return to Top-

    If you are talking about drawn cup needle bearings where the outer race is a thin sheet metal shell, then....
    They must be press fit into the housing because the roundness of the housing is what makes the bearing accurate.
    Also the shaft needs to be hardened into the Rc 55+ range. I am going from memory but a cold rolled shaft won't last long.
     
    Ulma Doctor and royesses like this.
  6. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

    Likes Received:
    443
    Trophy Points:
    63
    City:
    Red Wing
    State:
    Minnesota

    -Return to Top-

    Yes. That's what I've been reading.
    Thanks guys.
     

Share This Page