2rs or not 2rs. That is the question.

New Home Forum Mostly Printed CNC – MPCNC Advice – MPCNC 2rs or not 2rs. That is the question.

This topic contains 5 replies, has 4 voices, and was last updated by  Bill 1 week, 2 days ago.

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #108529

    Turbinbjorn
    Participant

    Hi all! The noob chiming in about the bearings here. I sometimes feel like a wuzz, nitpicking about all sorts of minor things, being nervous to get my hands dirty. Well – this time I’m pondering on the bearings!!

    First, a little background to defend myself against possible accusations that I don’t want to order form Ryan. I did get the electronics and some hardware from him, but the rest I have sourced locally and from chinese online retailers. The reason for this is that every order that is below 40 USD is exempt from VAT and tax! So if I’m able to split my orders in many small shipments, then they will come quite cheap. To compensate a little, I’m going to send Ryan a donation in the end, for this fantastic project.

    Well – about the bearings:

    First I ordered this one(the red type): https://www.aliexpress.com/item/32826813943.html?channel=twinner The order never seemed to go through, so I cancelled, and got this one(the black type): https://www.aliexpress.com/item/32797489318.html?channel=twinner

    Well – it turned out that both orders went through, so now I have a big bunch of (cheap and shitty) bearings,.

    The red ones are supposed to be 2RS, but only have a very thin plastic cover. It’s not even a tight fit, you can see through the inner side of the plastic shield and the inner ring. The product page says 2RS, but the bearing itself says 608RS only. They seem very prone to gather dirt. BUUUT – it rolls soo smooth, silent and quite firmly on the steel pipe.

    The black ones are listed as 2RS and they have 2RS printed on their sides, and they have a shield made of both plastic and metal. The fit is very tight, and you can’t see through it. They seem much better shielded against dirt. Buuut – they rattle like hell when they move on the pipes!!

    20190805_193525

    So the big question, to be or not to be:

    Should I use the smooth and firm rolling bearings, or the rattling noisy ones? The first are not shielded very well, but the last seem to have proper protection.

    Or – should I just get new ones? I still have to wait for new pulleys, since the chinese shops somehow have messed up this order as well.

    If I end up with ordering new bearings, I still want to try to keep it below 40 USD. The Amazon link from the parts pages are out of stock. Ryan – can you get us an Amazon alternative, so that you get a referall bonus? I’d easily go for Ryans shop, if it weren’t for the shipping alone almost exceedes the VAT limit..

    #108532

    Ryan
    Keymaster

    It doesn’t matter, build it and get it dirty, if anything goes wrong you have spares. The bearings are made for hundreds of pounds and thousands of RPM’s. They will never go bad for us.

    #108537

    Turbinbjorn
    Participant

    😀

    Thanks!

    #109538

    Turbinbjorn
    Participant

    New update from never ending building-story! I’ve built the basic frame with rollers and gantry. The rattling is awful! It might suffice when running on the belts, but the noise is really annoying – and I’m afraid that the very uneven rolling could eventually cause errors.

    The local bearing shop wouldn’t tell me the characteristics for their cheap 608 2RS, they insisted that I’d order their high quality option, that costs 6 USD pr piece. (!!)

    Therefore – I have ordered a full set of bearings from Ryan. Thanks a lot for the swift shipping!

    Here you can see how the cheap 2rs chinese bearings rolled: https://gofile.io/?c=ak7ZAo

    #109590

    Barry
    Participant

    Holy crap!  That looks like abused and used bearings!

    #109680

    Bill
    Participant

    Yikes! Those are some nasty bearings.

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