CAN RUNOUT BE USED ON A INTERRUPTED DIAMETER

[bxbzq]

See attached. I guess the answer is NO. Just want to confirm.

 

[bxbzq]

Here is the attachment.

 

[fsincox]

I would say so, I can't see the example, interuppted like a keyway or like (2) bosses?
Frank

 

[dgallup]

Strictly speaking I would say no but if you ignore any readings near the interruptions then you could get a quick & dirty measurement. The problem is going to be deciding when is the indicator movement due to an irregularity in the surface and when is the probe tip falling into the gap.

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[CheckerHater]

Couldn’t see the attachement. I am really interested to see an example.

Same opinion here: there is nothing wrong about specifying/checking runout on shaft with keyway.

Also, if you are interested, there was discussion on this topic here:

http://www.eng-tips.com/viewthread.cfm?qid=314178

And here:

http://www.eng-tips.com/viewthread.cfm?qid=350055

 

[fsincox]

Again I say: the reason I do not like runout is people think of it as a process/method and not a just a tolerance specification, this is a perfect example.
Frank

 

[CheckerHater]

Off-topic, but I know Frank will like it.

 

[pmarc]

CH,
May I know which book/article does this picture come from?

 

[fsincox]

CH,
That takes me back to my old machine tool days!
Frank

 

[CheckerHater]

The book:

http://www.amazon.com/Geometrical-D...ncing+for+design+manufacturing+and+inspection

Goes very much in-line with this discussion, isn’t it: thread1103-271641 ?

 

[powerhound]

Per the 2009 standard, circular runout can be applied to less than a 360 degree surface of revolution. Total runout is still 360 degrees though. Compare the 1994 definition of circular runout to the 2009. You will see that the wording has changed to allow for less than 360 degrees.

John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
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[fsincox]

OK, That is where I had seen this before, I have that book!
Frank

 

[pmarc]

In my opinion there is nothing wrong in applying runout (circular or total) to circumferentially interrupted surfaces of revolution.

As for the picture from G. Henzold's book... well, by definition (ISO or ASME) any kind of runout must involve datum axis. I think that speaks for itself.

 

[CheckerHater]

The picture from G. Henzold's book shows real-life functional requirement.

The fact that neither ASME or ISO is capable to satisfy the need speaks for yourself as well... :-(



















9

 

[pmarc]

The picture from G. Henzold's book shows real-life functional requirement.

So could you please explain the functional requirement to me?

 

[bxbzq]

You guys still have problem to see attachment?

 

[fsincox]

Shaft running parallel to a plane, I believe.
Frank

 

[CheckerHater]

I can finally see the attachment.
And I don’t see any problem.
It could be simpler if datum A was just one flat side of the “thickness”.
Yes, and don’t forget both A and B should be referenced RFS.

 

[fsincox]

I do not see any problem, either, looks like a motor rotor lam.
Frank

 

[dgallup]

The problem I have is that when you make a full revolution the indicator tip will fall into the surface interruptions and you will obviously have indicator movement beyond the spec. So it becomes a judgement call of when do you start and stop reading the indicator. As long as you stay away from the interruptions it is OK but what if you have some surface deviation near an interruption? You could either pass a bad part if you don't pick it up or reject a good part if you get into the interruption. Probably OK for a quick and dirty check but not something I would want to do for serial production.

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