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  1. EnglishMuffin

    PE Application Reference Choice

    BigInch : I'm not surprised that "somebody" didn't know the meaning of "renumeration" - it's not in our big office dictionary. I suppose it could mean "The process of renumbering" (grin).
  2. EnglishMuffin

    Micrometers

    I do like a friction thimble on a depth micrometer, but direct feel on an external micrometer.
  3. EnglishMuffin

    general question on splines

    There are also metric involute splines which have addendum shifted teeth as standard.
  4. EnglishMuffin

    Positional Tolerance and Datum Precedence

    Now we might be getting somewhere .... which one of you is correct ? What exactly does the standard say ? I think conceptually and logically it ought to work the way drawoh seems to think, but the impression I get is that the standard is actually written the way ringman says. I also think...
  5. EnglishMuffin

    Positional Tolerance and Datum Precedence

    ringman: The point is that I am assuming that it is specifically desired to orient the pattern of holes so that one reference plane is parallel to C - at least, that is apparently the design intent of person #2's drawing. This part (which is actually quite large) is being checked on a CMM -...
  6. EnglishMuffin

    Positional Tolerance and Datum Precedence

    drawoh: Well - I guess I am still not really getting my point across. I don't have a problem with anything you have said - I am not the person saying it should be A,C,B. The issue is not whether a particular interpretation makes sense, but what the wording of the ANSI Y14.5M - 1994 standard...
  7. EnglishMuffin

    Positional Tolerance and Datum Precedence

    drawoh: I am not disagreeing with you - I am in conflict with person #1, but I don't know enough about the standard to know if it is being interpreted correctly or if there is something wrong with it. The issues boil down to this: 1. If you make B the secondary datum and C the tertiary, is...
  8. EnglishMuffin

    Positional Tolerance and Datum Precedence

    ringman: I don't think you quite follow me - the slot does not go through the B axis - you cannot determine its orientation with a point on B and a point on the slot. And when you do determine it, as I understand it, you are supposed to be able to do it with points only, according to the...
  9. EnglishMuffin

    Positional Tolerance and Datum Precedence

    ringman - C is derived from an off-center feature (the slot)- so as far as I can see, you cannot angularly orient the two axes through B using C, with only one point on C - you would have to use two points - both of them on C. Drawoh seems to be in agreement with this, unless I misunderstand...
  10. EnglishMuffin

    Positional Tolerance and Datum Precedence

    ringman: I don't see how you can angularly orient the two planes through B, using the orientation of C, with only one point, regardless of whether C is defined as only one side of the slot or the slot feature itself. With the A,B,C designation, the third plane does not necessarily pass through...
  11. EnglishMuffin

    Positional Tolerance and Datum Precedence

    Thanks Drawoh. This question came up because of an argument between two people, and one of them casually asked my opinion. Person #1 is the best expert we have in the plant and is GD & T certified at technician level (he operates our large CMM and consequently gets heavily into the subject on a...
  12. EnglishMuffin

    Positional Tolerance and Datum Precedence

    Actually, I've just noticed on this recent thread1103-169440 that the ANSI standard section 4.4.2 seems to indicate that it should be A,B,C in this case. But still interested in any comments.
  13. EnglishMuffin

    Positional Tolerance and Datum Precedence

    Suppose we have a cylinder, with an off-center slot extending right across one end face. Suppose the surface of that end face is defined as Datum A, and that the axis of the cylinder is defined as Datum B by using a datum callout on the diameter. Also, suppose one side of the off-center slot is...
  14. EnglishMuffin

    Friction and contact area

    I did not notice the two posts after my last one until now. Even today, friction is a controversial subject, but the following quotes are taken from a relatively old book I possess entitled : "The Friction and Lubrication of Elastomers". I think they basically support the comments I have made in...
  15. EnglishMuffin

    why use nut factor instead of coefficient of friction?

    MintJulep - Just out of interest, why did lockwashers ever become prevalent in the first place ? They used to be all over the place on cars and electrical equipment, and in some cases still are. Were no tests ever done ? When was it discovered that they are in fact useless ? Wouldn't the kind...
  16. EnglishMuffin

    Friction and contact area

    For rigid materials, friction force is often said to be largely independent of the apparent contact surface area. Friction force is mainly dependent on the actual contact area, which is usually much less, and is heavily influenced by the normal force, having little relationship with the apparent...
  17. EnglishMuffin

    Helical Spring Lateral stiffness Value

    Since the lateral deflection of a coil spring involves both bending and torsion, wes616's formula must be incorrect, or at least incomplete, since it would have to involve both E & G. See the following - although it may be a little overcomplicated for what you need ...
  18. EnglishMuffin

    10:1 ratio long tools

    Talk to Kennametal. http://www.mmsonline.com/articles/1196scan1.html They have made special purpose long rotating tools with built-in vibration dampers. They are touchy to set up. Same concept has been used for a long time on non-rotating boring bars.
  19. 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...
  20. 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.

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