SCS8UU Bearing

Discussion in 'CNC Machines and Conversions' started by bmac2, Aug 14, 2018.

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  1. Aug 14, 2018 #1

    bmac2

    bmac2

    bmac2

    Well-Known Member Project of the Month Winner

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    I ordered a 4 pack SCS8UU bearing I’m thinking of using on the X axis of my laser engraver from one of my favourite Chinese suppliers and had a chance to mess around with them over the weekend.

    bearing8mm_HKAMEL.JPG

    On line I have read that they may be half the price of brand name but you should order extra.

    First off the oil (?) on them did not feel like oil and I think is more likely a rust inhibiter. After a good cleaning in Varsol I packed them with grease and 3 out of the 4 are now smooth as silk on an 8mm rod.

    The 4th one?

    The 4th one sounded like a tin can half full of gravel being kicked down a hill and I was honestly worried that it would damage the shaft. In for a penny in for a pound, I decided to take it apart.
    It came apart easily by just carefully prying off the seal and sliding the ball track out of the outer race. As I suspected there was dirt and a couple of large (relatively speaking) bits of metal in it.

    IMG_2762[1].jpg

    With everything cleaned up all that was left was to get all those little balls back into place. Luckily they stuck to the grease on the ball track and I hadn’t managed to lose any.

    IMG_2764.JPG

    Dropped the track back into the outer race, snapped the seal back into place and the bearing slides smoothly and quietly on the rod. Having bought tooling from overseas this was no surprise. I guess when you want it at a rock bottom price they have to cut corners somewhere. At just over a buck a piece you may have to take it apart and clean it yourself.

    IMG_2765.JPG
     
    Last edited: Aug 14, 2018
    bazmak likes this.
  2. Aug 14, 2018 #2

    Cogsy

    Cogsy

    Cogsy

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    I've heard bad things about them too, which might be fixed using your 'rip it apart and fix it' technique. If they don't hold up, I've heard many good things about the solid 'plastic' replacements of this size bearing, which are commonly used in consumer 3D printers. They're supposedly silky smooth and very long lasting. One day I'll order a few and check them out myself.
     

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