1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Bearing Job On My Bargain Baldor

Discussion in 'Grinders' started by dancom, Jun 5, 2018.

  1. dancom

    dancom Dust Maker Best Shop Tool

    Likes Received:
    770
    Trophy Points:
    113
    I found this Baldor 2 hp three phase motor on Kijiji for $40. The first photo from original ad.

    I took my multimeter with me and checked the motor leads. All phase-to-phase resistances were equal at 2.5 Ohms and high resistance to ground. Shaft was not seized so I loaded the beast in the trunk of my car.

    [​IMG]

    I cleaned it up and shot some new blue paint on it. After hooking it up to a VFD on the test bench I noticed the motor had an audible knock around 30 to 40 Hz. Sounds like some new bearings are in order.

    Princess Auto: 6205 and 6203 bearings, $5 each.
    Time: about 20 minutes total.

    I thought this may be of interest as most people have never seen inside an induction motor before.

    Take the fan shroud off. Three screws are holding it to the frame.
    [​IMG]

    Loosen the set screw on the collar and slide the fan off the motor shaft.
    [​IMG]

    Take all four bolts out. I used a socket on the impact drill.
    [​IMG]

    These are long screws and they may need a tap with a mallet to get them to slide out of the frame.
    [​IMG]

    A gentle tap on the bell will cause it to separate and come off.
    [​IMG]

    The old bearing will have lots of grease on it. Clean this up with a rag. Note inside the bells there are wavy washers. Wipe the grease out and inspect that it's not cracked or broken.
    [​IMG]

    Nudge the front bell off with a mallet. Clean the grease of the bearing and carefully slide the rotor out.
    [​IMG]

    With the rotor out on the the bench I used a 3-jaw 4" puller to pull the bearings off the motor shaft Drive End (DE).
    There is a noticeable "pop" when the inner race breaks free of the shaft and then it slid off quite easy. I found it easier to stick the rotor in a vise by the motor shaft.
    [​IMG]

    This is the old 6205 bearing. It is unsealed and can be lubricated from the top of the motor. After much research, I opted to go with a sealed 2RS version of this bearing. Yes the 2RS is sealed, but it has a lower temperature rating. As I don't expect the internal temperature to get much past 100°C the 2RS was a cheap and easy part.
    [​IMG]

    Pull the Opposite Drive End (ODE) bearing off the motor shaft. This is a 6203 bearing.
    [​IMG]


    Inside the stator. Wipe with a clean rag.
    [​IMG]

    I am heating the new bearings in the toaster oven set to 100°C (212°F). This heats and expands the steel so that it will slip in the motor shaft easier. (So the theory goes.)
    [​IMG]

    Hot bearing. Handle with gloves.
    [​IMG]

    I cleaned the shaft and gave it a squirt of lube. Once the bearing is heading on straight, I used a deep socket and hammer to tap the bearing up to the shoulder. It stops when it hits the shoulder so no guesswork about where it goes.
    [​IMG]


    I flipped the rotor over and put the 6205-2RS bearing on the Drive End.
    [​IMG]


    Slip the rotor inside the stator and put the rear (ODE) bell in place.
    [​IMG]


    The long bolts start from the rear and slide through the space between the outer frame and windings. There are four of these gapped areas to slide the bolts through. If some persuasion is required the rubber mallet works great, but try not to damage the last 1/2" of threads.
    [​IMG]

    Some gentle nudges and the bells are fitted. Put the nuts on the long screws and torque to about 40 inch pounds. (screw driver tight).
    [​IMG]

    Reattach the external fan and collar. Re-attach the fan shroud. Over to the bench for testing and this baby is smoothing and quiet. No more knocking.

    Hope this helps if someone wants to do this themselves one day and rejuvenate at perfectly great motor.

    Dan
     
    Last edited: Jun 5, 2018
    ToddR, PeterP and John Noon like this.
  2. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

    Likes Received:
    176
    Trophy Points:
    43
    Dan, you really need to have a TV show. Or at least a youtube channel. You're like this hybrid between Bill Nye, Norm Abrams, J. Neilson (or favorite knife maker of choice) and a cooking show host. Not to mention, you're fairly savvy with PC stuff and can take a mean photograph. You're a modern day renaissance man dude. The forum is lucky to have guys like you and Mr. Noon. Seriously though, have you ever thought about a Youtube channel? You could cover so many different things.
     
    dancom likes this.
  3. dancom

    dancom Dust Maker Best Shop Tool

    Likes Received:
    770
    Trophy Points:
    113
    I have a YouTube channel here, but it's more of a repository of videos that I use on my blog. Did someone say "snazzy production values"? LOL
     
    IamSteve-O likes this.
  4. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

    Likes Received:
    176
    Trophy Points:
    43
    Dude, you need like 10 minute episodes at least (preferably longer - like a TV show). We need to see video montages with inspirational theme music playing in the background. I'm thinking Eye of the Tiger or Juke Box Hero .. along those lines. Power tools, machinery, building, upcycling, fixing, tips, tricks and so forth... I think it'd be a huge hit. I'm just saying, you could have a budding YT creator career Dan... : )
     
  5. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

    Likes Received:
    176
    Trophy Points:
    43
    Not that I don't love the videos you posted there, don't get me wrong. I could watch build videos all day, is all.
     
  6. dancom

    dancom Dust Maker Best Shop Tool

    Likes Received:
    770
    Trophy Points:
    113
    Uh... maybe not. My wife tells me I have a face made for radio.
     
  7. Kevin Cox

    Kevin Cox KC knives

    Likes Received:
    294
    Trophy Points:
    63
    Nice find for a good price .
     
    dancom likes this.
  8. dancom

    dancom Dust Maker Best Shop Tool

    Likes Received:
    770
    Trophy Points:
    113
    Hint: I made a an email alert on Kijiji that messages me when new motors come up. ;)
     
    Kevin Cox likes this.
  9. IamSteve-O

    IamSteve-O New Member

    Likes Received:
    20
    Trophy Points:
    8
    Haha whaddya know Dan. I have already watched a few of your videos. The vector drawing and the MDF sharpening wheel.
     
    dancom likes this.

Share This Page