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  1. #21
    I was going to get them and then spend the time whilst they wing their way from the US looking at ways to do it :-)
    a man after my own heart :)

    I might buy a 50mm dia offcut of Ali and have a tinker on the lathe at work, will check to see if we have any boring tools to play with!
    thats more like it :) if you over size the bore just slap a bit of epoxy in there it should easily take the cutting force (just dont use your posh bearings on that one lol

  2. #22
    Just bought 2 off 2" dia x 50mm bits of Ali.....one to mess about with and the other to do the propper job :whistling:

    I was going to get them and then spend the time whilst they wing their way from the US looking at ways to do it :-)
    I'd best get started then as just been informed that they've been shipped
    Neil...

    Build log...here

  3. #23
    Just bought 2 off 2" dia x 50mm bits of Ali.....one to mess about with and the other to do the propper job :whistling:
    hahahahahaha!!!!!! i think me n you might have been separated at birth :rofl:

  4. #24
    Well they say you're supposed to measure twice, cut once........never works for me :confused: so I get twice what I need and mess the first one up :naughty:
    Neil...

    Build log...here

  5. #25
    John S's Avatar
    Lives in Nottingham, England, United Kingdom. Last Activity: 9 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,000. Received thanks 132 times, giving thanks to others 44 times. Referred 1 members to the community.
    Quote Originally Posted by Jonathan View Post
    Yes I looked for a while for 8mm angular contact bearings but only found one supplier, on eBay in america and not cheap. That was for single row, couldn't find any double row that size.
    In the smaller sizes they are known as magneto bearings, Arc keeps them, ask for E8's
    John S -

  6. #26
    Cheers John, when you know what they're called they're everywhere!! Still got to work out how to shield them.......
    Neil...

    Build log...here

  7. #27
    Quote Originally Posted by John S View Post
    In the smaller sizes they are known as magneto bearings, Arc keeps them, ask for E8's
    Hmm, I even looked there... must be blind:

    http://www.arceurotrade.co.uk/Catalo...-Ball-Bearings

    Quote Originally Posted by njhussey View Post
    Still got to work out how to shield them.......
    Aluminium disk or whatever with only a very very small clearence - enough to stop it touching, but not so big that it lets lots of dust in. I believe the term is aluminium labyrinth. Any seal which touches is going to generate a lot of heat due to friction.

  8. #28
    Quote Originally Posted by Jonathan View Post
    Hmm, I even looked there... must be blind:

    http://www.arceurotrade.co.uk/Catalo...-Ball-Bearings
    Or...

    http://simplybearings.co.uk/shop/p42...duct_info.html

    or...

    http://www.ebay.co.uk/itm/E8-MAGNETO...item2eaeaac383

    etc.....etc...

    Aluminium disk or whatever with only a very very small clearence - enough to stop it touching, but not so big that it lets lots of dust in. I believe the term is aluminium labyrinth. Any seal which touches is going to generate a lot of heat due to friction.
    Was going to see if I could reverse engineer a shield like on the 608RS bearings....or how about http://simplybearings.co.uk/shop/p24...duct_info.html but not sure what speed it's rated to....food for thought anyway!
    Neil...

    Build log...here

  9. #29
    Yes, easy once you know...


    Quote Originally Posted by njhussey View Post
    http://simplybearings.co.uk/shop/p24...duct_info.html but not sure what speed it's rated to....food for thought anyway!
    I doubt rubber seals are appropriate for the speed this will be running at. The bearings apparently already get hot, so a seal like that is just going to make it worse. I used some on my wind turbine, for each blade, and they add a lot of friction...but it didn't matter there as it's only a few rpm.

  10. #30
    Quote Originally Posted by Jonathan View Post
    I doubt rubber seals are appropriate for the speed this will be running at. The bearings apparently already get hot, so a seal like that is just going to make it worse. I used some on my wind turbine, for each blade, and they add a lot of friction...but it didn't matter there as it's only a few rpm.
    Just found out they are only good for 1000 rpm....damn!!! Just had a brainwave tho! Will contact our pump suppliers and see what they use...if they run them a 2 pole then that's 2900 rpm so might be better...will put some feelers out.
    Neil...

    Build log...here

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