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  1. tinnguyen123

    Why no tolerance on bearing ID/OD?

    yes it is a 3.5" nominal, just to fit the bearing.. if you look, that output shaft is a step-down shaft from a 4-7/16, to a 4-3/8, to 3.5.. I couldn't find any pillow block bearing larger than 3.5.. We already did a lot of calculation and this size should be more than adequate.. I'm just not...
  2. tinnguyen123

    Why no tolerance on bearing ID/OD?

    You guys are really scaring me. 1) Gearbox 2) Sprocket 3) Pillow Block 4) Brake for the motor 5) Motor The shaft is 4-3/8" Dia. All of this is to move a 10,000 LB concrete block(counter weight) up and down.. it'll moving about 20-30 RPM (Low RPM).. The bearing is rated for 22,900 Dynamic...
  3. tinnguyen123

    Why no tolerance on bearing ID/OD?

    This was what I was expecting... because not many vendor provide bearing ID/OD tolerances. I never heard of ntnamerica, feel ashamed. Another question, if anyone mind answering. I know larger bearing/heavy machinery usually require tight fits. Can I get away with going under sizing the shaft...
  4. tinnguyen123

    Why no tolerance on bearing ID/OD?

    Hello, I been trying to design my shaft for a bearing that meet the specs.. However, the manufacture usually only give a nominal size.. Then I went and look for others.. and they all seems to only give a nominal size.. is there a reason to that?
  5. tinnguyen123

    Chain accessories options...

    Do you happen to have a picture of it? I'm having a hard time picturing it.. [sad]
  6. tinnguyen123

    Chain accessories options...

    Its a one time balance, that's how I see it too.. I was hoping for something safe that's available.. Our company has been using this setup for years, but it's always been done on a smaller scale and the adjustment were already difficult to do.. but now they're 5/8" size chains, so we have to...
  7. tinnguyen123

    Chain accessories options...

    Thanks RolMec for your suggestion, but what jgKRI said is correct, I asked the RUD ppl already, its state on their catalog that those are not made for lifting. @jgKRI, I'm using lifting chains to lift a counterweight. I'm just trying to adjust the chain without removing links. There's...
  8. tinnguyen123

    Chain accessories options...

    Hello, Does anyone know of something that's similar to a turnbuckle, but is use for a lifting chain...? This is the closest I can come to, but it's not made for lifting.. https://www.mcmaster.com/#2967T6
  9. tinnguyen123

    Pully/Pocket wheel for Lifting chains...

    Roller chains is a no go because they're just not strong enough for our application. On top of that it'll be inside a really hot environment (1200F), so it'll be even weaker. I went with lifting chain because of its heavy duty nature & there are some studies with numbers on temperature effects...
  10. tinnguyen123

    Pully/Pocket wheel for Lifting chains...

    I have a couple of more concern... Here's my quick sketch.. http://imgur.com/EXP8Jua does anyone see anything wrong with using the lifting chains this way? the pocketwheels are free spinning because from my research, these wildcat/pocketwheels are ment to be pull like a hoist, and in my...
  11. tinnguyen123

    Pully/Pocket wheel for Lifting chains...

    Hello, I'm just wondering, is there such thing as an Idler wheel/sprocket/gear thing for a lifting chain? Similar to these: http://www.pewagchain.com/Products/Forderketten/Hebezeugketten/Kettenrader/TRP-Taschenrader.aspx I've talked to these guys about their sprocket, but they're saying I...

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