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IndustryArena Forum > MetalWorking > MetalWork Discussion > cutting a bearing seat in 4340 tube
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  1. #1
    Join Date
    May 2015
    Posts
    17

    cutting a bearing seat in 4340 tube

    I need to cut a bearing seat into the end of a piece of 4130 tube. The tube is 1/2 inch with an 0.083 wall. So that's .5000 OD and .3440 ID. The seat needs to be 0.3745.
    I can drill and ream to .374, but I need to get that last .0005, without going over. I can't get any boring tool I have into that small a space. I would appreciate any suggestions you guys might have.

  2. #2
    Join Date
    Nov 2012
    Posts
    68

    Re: cutting a bearing seat in 4340 tube

    Quote Originally Posted by jimlake View Post
    I need to cut a bearing seat into the end of a piece of 4130 tube. The tube is 1/2 inch with an 0.083 wall. So that's .5000 OD and .3440 ID. The seat needs to be 0.3745.
    I can drill and ream to .374, but I need to get that last .0005, without going over. I can't get any boring tool I have into that small a space. I would appreciate any suggestions you guys might have.
    Get it to .374 then just use sand paper to bring it to .3745, be careful, use fine grit, watch your fingers. Check the size often while sanding.
    Good luck.

  3. #3
    Join Date
    May 2015
    Posts
    17

    Re: cutting a bearing seat in 4340 tube

    I found a .3745 ream on MSC. Thx.

  4. #4
    Join Date
    Jan 2005
    Posts
    1943

    Re: cutting a bearing seat in 4340 tube

    Adjustable reamer also would work.

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