Measuring an internal groove for a snap ring suggestions

B

Brad Eickhoff

#11
Re: Suggestions for measuring an internal groove for a snap ring?

Hi Discordian,

If you could get an accurate measurement of the ID (using deltronic pins), then lay the part on it's side.

Use a height gage with with an indicator (graduation .00005") find the low spot on the ID, zero the height gage/indicator, and then lower the indicator tip into the ring groove finding the low spot, multiply the difference by 2 and add to the ID diameter.

I checked our indicator tip and the diameter was aprox .039". Since the width of your groove is a reference dimension of .019" it would not hurt to widen this by .001" or so, for the tip to fit in.

I would then use Ederie suggestion of metrology puddy to verify that that the width of the groove is consistant, so I am not hitting a high or low spot, inside the groove, with the indicator tip.

You also mentioned cutting the part for a first article. If the ID is manufactured with the same tool as the groove. Could you not use the first article dimension on the ID dimension (with deltronic pins again) to determine the exact offsets you need to adjust the groove to stay in tolerance? Then you could base your groove ID off of the ID and adjust accordingly to the ID.

Brad
 
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ScottK

Not out of the crisis
Staff member
Super Moderator
#13
Re: Suggestions for measuring an internal groove for a snap ring?

Were the folks at Truarc of any use?
send a message via their web site - no response yet. But we do buy a few parts from them so if I don't get anything back I'll drag our purchasing guy into the action.
I'm going to try the same with our other supplier of these.
 

gard2372

Quite Involved in Discussions
#14
Re: Suggestions for measuring an internal groove for a snap ring?

Just trying to keep this simple....


IMHO Will the customer allow you to (after machining the groove) to peform a type of fit form function verification by just inserting the correct size mating ring into the groove and check for proper seating?

In other words will your customer allow you to write this into your procedures as the verification of the groove dimensions?
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#15
Re: Suggestions for measuring an internal groove for a snap ring?

Just trying to keep this simple....


IMHO Will the customer allow you to (after machining the groove) to peform a type of fit form function verification by just inserting the correct size mating ring into the groove and check for proper seating?

In other words will your customer allow you to write this into your procedures as the verification of the groove dimensions?
We could probably do that.
But I'd really like to be able to measure so I can help show to the chief engineer whether or not our process is capable of +/- .001" on that dim.
 

Wes Bucey

Quite Involved in Discussions
#16
Re: Suggestions for measuring an internal groove for a snap ring?

We could probably do that.
But I'd really like to be able to measure so I can help show to the chief engineer whether or not our process is capable of +/- .001" on that dim.
What did you learn so far?
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#17
Re: Suggestions for measuring an internal groove for a snap ring?

What did you learn so far?
...that the customer's statistician is on our side because he convinced the project manager that it is a pointless dimension to measure on anything beyond first article.
 

Wes Bucey

Quite Involved in Discussions
#18
Re: Suggestions for measuring an internal groove for a snap ring?

...that the customer's statistician is on our side because he convinced the project manager that it is a pointless dimension to measure on anything beyond first article.
I'm disappointed. I was really curious about an efficient method or tool to do the job Once you raised the topic, it was like one of those "worm tunes" you just can't get out of your head.
 

Jim Wynne

Staff member
Admin
#19
Re: Suggestions for measuring an internal groove for a snap ring?

I'm disappointed. I was really curious about an efficient method or tool to do the job Once you raised the topic, it was like one of those "worm tunes" you just can't get out of your head.
I've faced this situation many times, and I'm pretty sure that trying to measure an internal groove such as the one in question, to the precision specified, isn't practically possible. While Discordian says that the customer is willing to forgo all but first-article inspection of the feature, if you can inspect it once, you can inspect it twice. As we've often said here, the best way to deal with this sort of thing is at the front door, and not when an inspector, probably faced with time constraints, is scratching his head and trying to figure out a way to defy the laws of physics.
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#20
Our last thought before it was determined not to measure in process was to modify a bore gauge by grinding down the the three "fingers" so they would fit into the groove.
 
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