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Thread: 24" X 1" Belt Grinder

  1. #11
    Supporting Member LMMasterMariner's Avatar
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    Quote Originally Posted by DIYSwede View Post
    Thanks for clarifying!
    From my (too) quick glance at the drawings I thought the crowned wheel was on the top front position,
    now I realize I was wrong, again!

    I guess shoulda gone through your eminent drawings more carefully - not jumping to conclusions... Ah, well.

    ATB
    Johan
    Thanks for the word 'eminent' when describing my drawings, which are all made by MS Paint. PhotoFiltre is used to rotate parts and gears are designed with GearDXF. Never had patience to start learning and using any CAD program.

    Cheers
    LMMasterMariner

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  2. #12
    Supporting Member DIYSwede's Avatar
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    Quick question: -Anybody having problems overrevving ball bearings?

    For instance, given the 12 000 rpm angle grinder and a 60 mm OD drive wheel,
    the suggested 62200 2RS1 (with 17000 max rpm) would get up to 24 k rpm...

    (A 43 mm OD drive wheel would keep the revs down, but still provide 60 mph belt speed)

    Any risk and/ or damage assessments out there?

    Just asking, and better safe than sorry...

    Johan
    Last edited by DIYSwede; Jun 19, 2021 at 08:46 AM.

  3. #13
    Supporting Member old_toolmaker's Avatar
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    Ball Bearings

    Several years ago I had a high rpm air powered hand grinder. I had two of these totally blow apart where the ball bearings simply disintegrate. Pieces flew everywhere. I think it hade something to do with not having dry air. I should have had a better air lube system as well.
    Dick


    Links to some of my plans:

    https://www.homemadetools.net/forum/...965#post105972 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

  4. #14
    Supporting Member DIYSwede's Avatar
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    OTOH: Given the 17000 max rpm of a 10 mm OD inner axle,
    would perhaps allow the 30 mm outer race a max (theoretical) rpm of 25 500 rpm
    (given an assumed ball cage max rpm of 8500 rpm)?

    https://en.wikipedia.org/wiki/DN_Factor

    I still remember my engineering teacher in 1977 dissing rotating outer races rather than inner axles.
    BAD engineering practice...

    Or, am I mistaken (again)?

    Johan
    Last edited by DIYSwede; Jun 19, 2021 at 09:27 AM. Reason: added 1977 flashback

  5. #15
    Supporting Member old_toolmaker's Avatar
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    Bearings

    Unless I am mistaken, I would think the outer race would rotate at would rotate at a slower speed than the inner race. But I am not an engineer.
    I am still interested in what you find. Maybe the manufacturer could shed some light on this.
    Dick


    Links to some of my plans:

    https://www.homemadetools.net/forum/...965#post105972 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

  6. #16
    Supporting Member LMMasterMariner's Avatar
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    Quote Originally Posted by DIYSwede View Post
    Quick question: -Anybody having problems overrevving ball bearings?

    For instance, given the 12 000 rpm angle grinder and a 60 mm OD drive wheel,
    the suggested 62200 2RS1 (with 17000 max rpm) would get up to 24 k rpm...

    (A 43 mm OD drive wheel would keep the revs down, but still provide 60 mph belt speed)

    Any risk and/ or damage assessments out there?

    Just asking, and better safe than sorry...

    Johan
    Yes. You are right. Thanks for pointing this out.
    It's better to put 3 bearings 6200 2Z (limiting speed 24000 rpm) than 2 bearings 62200 2RS1.
    When I was ordering bearings, I ordered 6 pcs 62200 2 RS1 and 9 pcs 6200 2Z, but decided to keep these 6200 2Z for some other projects.
    Will replace them once I come back home.

    Cheers LMMasterMariner

  7. #17
    Supporting Member DIYSwede's Avatar
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    No big deal - I was just bothering my brain with this.

    Hypothesis: When an axle in an inner race rotate @ 17000 rpm,
    hence the cage should rotate with half that rpm (as the outer race is fixed) 8500 rpm, Right?
    This is where I was mistaken:
    In wrongly assuming the outer race could turn faster than twice the given ball cage max speed.

    Thanks for pitching in, you guys!
    Johan

    PS:"Nobody can fool me as effectively and easily as I can"
    Last edited by DIYSwede; Jun 19, 2021 at 11:23 AM. Reason: Added PS

  8. #18
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by DIYSwede View Post
    ...PS:"Nobody can fool me as effectively and easily as I can"
    The first principle is that you must not fool yourself - and you are the easiest person to fool. - Richard Feynman

    You're in good company. It's a darn hard thing to learn. DAMHIKT.



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