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  1. #1
    Join Date
    Apr 2007
    Posts
    347

    Default Bushings for Pipe Roller Jack Stand

    I'm in the process of making a couple of pipe jack stands. Instead of the standard "V" heads, these are going to have two 1/2" x 4" disc type rollers. I've turned them on the lathe already but want to press in bronze bushings instead of just driling a hole in the steel disc.

    My question is this: What size should I drill/ream/bore the hole in the disc roller? The bronze bearings I've purchased are 3/4" OD and 1/2" ID. I've already drilled 1/2" holes in the frame for the pins and the bushings slide over them quite nice. However, I need to press in the bushings so they are tight in the disc rollers and don't spin. I've measured the bushings and they are pretty much spot on (0.7500 OD and 0.500 ID). I'm guessing I need to bore the holes slightly under and press in the bushing, but I'm not sure by how much. I guess I could bore a few test holes and figure it out, but thought you guys might help me get it right the first time.

    Thanks
    Millermatic 35
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  2. #2
    Join Date
    Jun 2009
    Location
    SE Michigan
    Posts
    45

    Default

    Most of the time when I'm going for a decent cold press fit, I bore the holes .003" undersize and put a slight lead on the bushings with a file.

  3. #3
    Join Date
    Apr 2007
    Posts
    347

    Default

    Taking a closer look at the bushings, they are 0.005 over. I can purchase a reamer that is 0.7490. Perhaps that would be an option instead of setting up and dialing in my boring bar. Would that be too tight or should I go with the 0.7500 reamer?
    Attached Images Attached Images
    Last edited by garybdavis; 11-30-2010 at 07:10 AM.
    Millermatic 35
    Miller TB302G
    Ellis 1800
    Smith & Victor Torches
    Optrel Satellite
    Arcair K4000
    Ingersoll-Rand 175CFM Diesel Air Compressor
    Home Made Welding Trailer

  4. #4
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,376

    Default

    If you goof up a bit Locktite them in.

  5. #5
    Join Date
    Apr 2007
    Posts
    347

    Default

    Red or blue? You know, I can always count on Sberry for the old shop tricks!

    I ordered a 0.7500 reamer because I'm too lazy to dig out my nice high dollar Kennamental boring bar and make multiple passes to dial it in. I had to order some more bushings and they are spec'ed at 0.0000 to -0.0005 or something like that. So, locktite may be required depending on how bad my lathe is vibrating that day.
    Millermatic 35
    Miller TB302G
    Ellis 1800
    Smith & Victor Torches
    Optrel Satellite
    Arcair K4000
    Ingersoll-Rand 175CFM Diesel Air Compressor
    Home Made Welding Trailer

  6. #6
    Join Date
    Aug 2006
    Location
    Raymore Missouri
    Posts
    1,920

    Default

    It's looks like you have a hub. Why not drill a hole and use a roll pin. Very easy.
    Nick
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