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  1. EnglishMuffin

    Effect of applied moment on B10 life?

    I believe you can still get Bert Jones' (the original) - I think somebody told me that his son sells it, but I'm not sure. When ABODE first came out, I think it was then the best available, other than bearing manufacturer's proprietory stuff. But the top of the line COBRA is probably the best...
  2. EnglishMuffin

    Effect of applied moment on B10 life?

    Try this : http://www.advanced-bearing.com/ TK solver based - not cheap - used to cost about 5 grand.
  3. EnglishMuffin

    Seal design

    We have just had a visit from the CEO of Weiss (a leading German spindle manufacturer) - and he said they have just developed a state of the art grease lubing system which replenishes the grease automatically at intervals, and you don't have to stop the spindle. I think it is going to be in...
  4. EnglishMuffin

    Bearing running temperature

    Yes, Tmoose is absolutely right - in fact, when you do get runaway, it is so fast that even an automated rate sensing shut down often cannot catch it. But from what you have explained about your new spherical bearing design with lots of clearance, it may be that thermal runaway is not going to...
  5. EnglishMuffin

    Bearing running temperature

    You must measure the bearing temperatures close to the bearing races for the readings to mean anything. The usual method is to drill a hole into the bearing location bore so that a thermocouple/thermistor/RTD etc can be placed directly in contact with the outer race, usually in conjunction with...
  6. EnglishMuffin

    Seal design

    Sorry JeanMicheling and others - I am misleading everyone. It wasn't the University of Aachen - it was the University of Stuttgart. Title : Konstruktionsrichtlinien fur beruhrungsfreie Spinddelabdichtungen im Werkzeugmaschinenbau - Teil 2 or "Construction Guidelines for Non-contacting Seals of...
  7. EnglishMuffin

    Seal design

    Yes, I think bearing failure caused most of the Inpro failures in our case. But in addition, as so often happens, if something isn't applied correctly from the start, it fails and gets a bad rap, which can then never be overcome regardless of who is running things. But as I said, I think using...
  8. EnglishMuffin

    Seal design

    We (I won't say who) have had rather bad luck with those Inpros. Maybe it was our fault.
  9. EnglishMuffin

    Seal design

    With machine tool spindles, except for very low speeds, you should avoid contacting seals because they generate so much heat. So that means designing some sort of labyrinth, or in some cases a flinger. You can buy ready made labyrinth seals from GMN (see web site). There is a very comprehensive...
  10. EnglishMuffin

    Housing material

    If possible, I would use steel, although cast iron is easier to machine and cheaper in quantity, especially if the shape required is complex. Differences in thermal properties are probably relatively insignificant compared to other variables.
  11. EnglishMuffin

    Seal design

    See following : http://news.thomasnet.com/fullstory/13381/954 May only be available on SETCO spindles or under licence.
  12. EnglishMuffin

    Spindle's reliability

    Well - maybe a little bit. I've never worked in any industry but machine tools.
  13. EnglishMuffin

    taut wire alignment limits

    Don't see why you couldn't do it with a regular bore alignment laser - it's not really the laser that's the problem - it's the tooling you would have to make to mount the laser and targets on - probably big disks with holes in them.
  14. EnglishMuffin

    Spindle's reliability

    If you have a "thermal runaway" situation, increased preload will only make matters worse. Do you have bearing pairs with light, medium or heavy preload built into them? If you already have light preload ones, there is not much you can do there other than order specially made ones. The fretting...
  15. EnglishMuffin

    Spindle's reliability

    Well, I suppose the next question should be - do all four bearings overheat ? Do you notice any difference between the four(?) failed bearings ? If I had to guess, I would say that the "floating" bearing pair is not floating properly, perhaps because the outer race (or cartridge) fit is such...
  16. EnglishMuffin

    Spindle's reliability

    Exactly what type of failure are you seeing ? Are the bearings overheating just prior to failure? I expect so, if they are failing that rapidly and you suspect preload. But without seeing a cross sectional drawing of the spindle, it's a little difficult to say what the source of the problem...
  17. EnglishMuffin

    needle bearing calculation

    With most rolling element bearings, you generally get better life with a smaller number of larger rolling elements, assuming the same pitch diameter. Of course, in practice things also depend on the exact geometry and space available etc, so the pitch diameter may not be an independent variable...
  18. EnglishMuffin

    Taper Roller -pumpin action

    If you need to preload the bearings, grease (including Kluber) does not work very well. (This is based on personal bitter experience, and I think knowledgeable people at Timken will confirm it, assuming you can get hold of them). You need really good lubrication between the rib and the ends of...
  19. EnglishMuffin

    Taper Roller -pumpin action

    Yes, they do, because of centrifugal effects. But why do you think this is "doing your head in"? (I presume you mean some sort of "spindle head").
  20. EnglishMuffin

    sketch or idea needed

    cole7011: Sorry I didn't respond immediately - been busy. Actually, although you can certainly do it with a hexagon shaped shaft as rmetzger says, I was actually thinking of the ultimate in cost and sophistication - the rarely seen "Polygon" profile - at one time a trade name - eg see...

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