Spherical Bushing Inspection Method

[cjohnso0]

Greetings folks!

I'm looking for some assistance in inspection of a spherical bushing inner diameter. Attached is a sketch of the part, and the relevant dimensions. I need only to check the inner spherical diameter on this part, in very limited quantities.

I've looked at several gages, none of which seem to be the right choice:

Split Ball Mic - Don't seem to come large enough
Dial Bore - Doesn't fit correctly
Telescoping ID Mic - Not accurate enough.

So if anyone has any experience with inspection of this sort of feature, any feedback at all would be greatly appreciated.

Thanks in advance.

 

[rustbuster]

What you want is spring loaded ID Calipers. Photo attached

 

[ajack1]

Do you want to measure it or inspect it?

A telescopic bore gauge would allow you to measure with a mic but probably not the best for a 0.0006” limit, a CMM would work fine but obviously not cheap.

If you just want to inspect could you not get a go-nogo gauge made on upper and lower limits but only say .500 wide so it could be fed through the “hole”.

 

[cjohnso0]

rustbuster,

That gage doesn't look to be accurate enough, as I'd have to measure the distance across the points after removal.

ajack1,
I'm inspecting the bore (well, I think I am anyways) for serviceability to check for wear, etc...

We do have a few CMM's, the only problem being that the bushing is installed in another part, resulting in a pretty complex geometry, i'll check with the CMM programmer though. Also the go-no go sounds like a good thing to look into.

I've got a few paths to look down now, thanks!

 

[ajack1]

Here is another option but not sure you will get the accuracy you are looking for.

 

[unclesyd]

I can't see the picture by rustbuster so excuse me if this is a duplicate.
I would give Dyer a call and get their catalogue along with their recommendations. Their website is a little hard to navigate.

http://www.dyergage.com/index.htm

You can use a gage similar to this or better yet add a couple of carbide balls to the points. I can;t gave you a better idea as my old catalogue numbers don't match.

http://dyergage.thomasnet.com/item/...100?&plpver=10&origin=keyword&filter=&by=prod

 

[ajack1]

That is more or less what I linked to Unclesyd.

However it remains debatable of something that measures to .0005” or .00039” in my case would be accurate enough to measure a limit of .0006”.

 

[unclesyd]

ajack3, Yes they are very similar and probably like the one's posted by rustbuster.

I know that Dyer makes comparator gages which have a narrower range with 0.0005" graduations and therefore can be interpreted to 0.00025" .
It gets real tricky when you start to measure plus/minus 0.0005 on a worn or non uniform surface.

To get more precision than afforded by gages from Dyer and others you will have to go to companies like Hanlo.

http://www.hanlogages.com/index.htm

cjohson0,

How much wear can you have and not be problem?
If say it's 0.0001" you could have a special gage made that act as a go/no-go gage.

Where have you seen the wear on the part?

 

[mfgenggear]

Mueler Gages

http://www.mueller-gages.com/